Conjoint Associate Professor Raj Rajagopalan

Conjoint Associate Professor

School of Engineering (Mechanical Engineering)

Career Summary

Biography

Research Expertise
Mechanical engineering

Qualifications

  • PhD, Indian Institute of Science
  • Bachelor of Engineering, University of Madras
  • Master of Engineering, Indian Institute of Science

Keywords

  • Mechanical Engineering

Fields of Research

Code Description Percentage
010599 Mathematical Physics not elsewhere classified 20
091599 Interdisciplinary Engineering not elsewhere classified 20
091399 Mechanical Engineering not elsewhere classified 60
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Chapter (1 outputs)

Year Citation Altmetrics Link
2014 Rajagopalan S, Lefeuvre N, Antonia RA, Djenidi L, 'Wake manipulation using control cylinders in a tandem arrangement', Lecture Notes in Mechanical Engineering 161-166 (2014)

© Springer-Verlag Berlin Heidelberg 2014. The drag reduction phenomenon of a circular cylinder is investigated, using an X-wire probe, by placing a smaller diameter control cylin... [more]

© Springer-Verlag Berlin Heidelberg 2014. The drag reduction phenomenon of a circular cylinder is investigated, using an X-wire probe, by placing a smaller diameter control cylinder of either circular or square cross-sectional upstream of the main circular cylinder. The separation between the two cylinders was chosen so as to minimise the overall drag of the main cylinder. Although both configurations resulted in drag reduction, the square control cylinder yielded a bigger reduction and had a greater impact on the mean velocity and turbulent velocity fluctuations in the wake. Both control cylinders led to a reduction in the wake half-width. Spectra in the near wake did not indicate any suppression in vortex shedding.

DOI 10.1007/978-3-642-40371-2_23
Co-authors Robert Antonia, Lyazid Djenidi

Journal article (51 outputs)

Year Citation Altmetrics Link
2013 Rajagopalan S, Antonia RA, Djenidi L, 'Effect of mesh grids on the turbulent mixing layer of an axisymmetric jet', Heat Transfer Engineering, 34 1216-1225 (2013) [C1]

This article focuses on the effect that two different mesh grids have on the structure of the mixing layer of an axisymmetric jet. Detailed measurements of mean velocity and turbu... [more]

This article focuses on the effect that two different mesh grids have on the structure of the mixing layer of an axisymmetric jet. Detailed measurements of mean velocity and turbulent velocity fluctuations are made with an X hot-wire probe in the range 0.5 = x/d = 10, where x is the longitudinal distance from the nozzle exit plane and d is the nozzle diameter. The grids are introduced at two locations-one location just downstream of the nozzle exit plane and the other location upstream of the nozzle exit plane in order to perturb the nozzle exit boundary layer. One mesh completely covers the nozzle (full mesh or FM) and the other mesh covers the central, high-speed zone (disk mesh or DM). With reference to the undisturbed jet, FM yields a significant reduction in the turbulence intensity and width of the shear layer, whereas DM enhances the turbulence intensity and increases the width of the shear layer. Both grids suppress the formation of the Kelvin-Helmholtz instability in the mixing layer. Results are presented, mainly at x/d = 5 and 6 in both the spectral domain and physical space. In the latter context, second-and third-order structure functions associated with u (the longitudinal velocity fluctuation) and v (the lateral or radial velocity fluctuation) are presented only for the flow perturbed by placing the mesh outside the nozzle. All mesh geometries have a more significant effect on the second-order structure function of u than on that of v. The third-order energy transfer term is affected in such a way that, relative to the undisturbed jet, its peak location is shifted to a smaller scale when FM is used and to a larger scale with DM. This is consistent with our observations that FM reduces the turbulence in the shear layer while DM enhances it. It is suggested that the large-scale vortices that are formed at the edge of the grids play a significant role in the transfer of energy. © 2013 Taylor & Francis Group, LLC.

DOI 10.1080/01457632.2013.776908
Citations Scopus - 2Web of Science - 2
Co-authors Robert Antonia, Lyazid Djenidi
2012 Lee S-J, Kim H-L, Lee J-P, Rajagopalan SR, 'Jet flow characteristics of sinusoidal wavy nozzles', Journal of Mechanical Science and Technology, 26 4007-4016 (2012) [C1]
Citations Scopus - 3Web of Science - 2
2007 Xu G, Zhou T, Rajagopalan SR, 'Similarity of intermittency characteristics of temperature and transverse velocity', Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 76 (2007) [C1]
DOI 10.1103/physreve.76.046302
Citations Web of Science - 7
2007 Rajagopalan SR, Antonia RA, 'Turbulence and drag control in jet and wake flows', Sadhana - Academy Proceedings in Engineering Sciences, 32 133-144 (2007) [C1]
DOI 10.1007/s12046-007-0012-z
Citations Scopus - 2Web of Science - 1
Co-authors Robert Antonia
2007 Xu G, Antonia RA, Rajagopalan SR, 'Scaling of mixed longitudinal-transverse velocity structure functions', Europhysics Letters, 79 44001 (2007) [C1]
DOI 10.1209/0295-5075/79/44001
Citations Scopus - 1Web of Science - 4
Co-authors Robert Antonia
2005 Rajagopalan SR, Antonia RA, 'Flow around a circular cylinder - structure of the near wake shear layer', Experiments in Fluids, 38 393-402 (2005) [C1]
DOI 10.1007/s00348-004-0913-0
Citations Scopus - 45Web of Science - 42
Co-authors Robert Antonia
2004 Burattini P, Antonia RA, Rajagopalan SR, Stephens ML, 'Effect of initial conditions on the near-field development of a round jet', Experiments in Fluids, 37 56-64 (2004) [C1]
DOI 10.1007/s00348-004-0784-4
Citations Scopus - 31Web of Science - 24
Co-authors Robert Antonia
2003 Olsen JF, Rajagopalan SR, Antonia RA, 'Jet column modes in both a plane jet and a passively modified plane jet subject to acoustic excitation', Experiments in Fluids, 278-287 (2003) [C1]
DOI 10.1007/s00348-003-0663-4
Citations Scopus - 6Web of Science - 5
Co-authors Robert Antonia
2001 Xu G, Rajagopalan S, Antonia RA, 'Genetic alterrations of microsatellite markers at chromosome 17 in non-small cell lung cancer', Chinese Journal of Cancer Research, 13 181-184 (2001)

Objective: To analyse the microsatellite instability (MI) and loss of heterozygosity (LOH) in non-small cell lung cancer (NSCLC). Methods: MI and LOH at chromosome 17 were checked... [more]

Objective: To analyse the microsatellite instability (MI) and loss of heterozygosity (LOH) in non-small cell lung cancer (NSCLC). Methods: MI and LOH at chromosome 17 were checked in 35 cases of NSCLC tumor-normal paired tissues using four microsatellite markers TP53 (17p13.1), THRA1 (17q11.2-12), D17S579 (17q12-21) and D17S855 (17q21) by PCR based analysis. Mutations of P53 exons 5-8 were also tested using PCR-single strand conformation polymorphism (PCR-SSCP) and PCR-denaturing gradient gel electrophoresis (PCR-DGGE) analysis. Results: 22 of 35 tumors (62.8%) displayed MI or LOH. 14 tumors (40.0%) exhibited MI, 11 tumors (31.4%) exhibited LOH, while 3 tumors (8.6%) exhibited MI and LOH concurrently. 23 tumors (8.6%) exhibited P53 gene mutations. The frequency of MI or LOH was obviously higher in the early-stage (stages I and II, 78.9%) than in the advanced-stage (stage III, 43.8%). However, the frequency of MI or LOH had no difference either between high-grade (75.0%) and low-grade (52.6%) differentiated NSCLC or between the tumors with P53 mutations (59.1%) and those without P53 mutations (69.2%). No relationship was observed between the presence of MI or LOH and the histologic subtype of NSCLC. Conclusion: The results suggest that MI and LOH at chromosome 17 may play a significant role in the development of NSCLC. The high frequency of MI or LOH in the early-stage tumors indicates that these genetic alterations could occur early during NSCLC development. Our data also show that the genetic alterations of microsatellite at chromosome 17 was not associated with P53 gene mutations.

DOI 10.1007/BF02983881
2001 Xu G, Antonia RA, Rajagopalan SR, 'Sweeping decorrelation hypothesis in a turbulent round jet', Fluid Dynamics Research, 28 311-321 (2001) [C1]
Citations Scopus - 4Web of Science - 4
Co-authors Robert Antonia
2000 Xu G, Rajagopalan SR, Antonia RA, 'Approach to isotropy in a smooth wall turbulent boundary layer', Fluid Dynamics Research, 26 1-11 (2000) [C1]
Citations Scopus - 4Web of Science - 6
Co-authors Robert Antonia
2000 Xu G, Antonia RA, Rajagopalan SR, 'Scaling of mixed longitudinal velocity-temperature structure functions', Europhysics Letters, 49 452-458 (2000) [C1]
Citations Scopus - 13Web of Science - 11
Co-authors Robert Antonia
2000 Xu G, Antonia RA, Rajagopalan SR, 'Scaling of mean temperature dissipation rate', Physics of Fluids, 12 3090-3093 (2000) [C1]
Citations Scopus - 5Web of Science - 5
Co-authors Robert Antonia
2000 Olsen JF, Rajagopalan S, 'Vortex shedding behind modified circular cylinders', JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 86 55-63 (2000)
DOI 10.1016/S0167-6105(00)00003-9
Citations Scopus - 17Web of Science - 12
1998 Rajagopalan SR, Antonia RA, 'Turbulence Reduction in the Mixing Layer of a Plane Jet Using Small Cylinders', Experiments in Fluids, 25 96-103 (1998) [C1]
Citations Scopus - 16Web of Science - 9
Co-authors Robert Antonia
1998 Rajagopalan SR, Zhou T, Antonia RA, 'Three-component turbulence measurementsusing a four-wire probe', Flow Measurement and Instrumentation, 9 211-216 (1998) [C1]
Citations Scopus - 2Web of Science - 1
Co-authors Robert Antonia
1996 Antonia RA, Rajagopalan S, Zhu Y, 'Scaling of mean square vorticity in turbulent flows', EXPERIMENTS IN FLUIDS, 20 393-394 (1996)
Citations Scopus - 15Web of Science - 11
Co-authors Robert Antonia
1996 Rajagopalan S, Ko NWM, 'Velocity and spanwise vorticity measurements in an excited mixing layer of a plane jet', Experiments in Fluids, 20 346-357 (1996)

The mixing layer of a plane jet was subjected to periodic weak excitation at two different frequencies corresponding to shear layer mode (St ¿ =0.012) and preferred mode (St D =0... [more]

The mixing layer of a plane jet was subjected to periodic weak excitation at two different frequencies corresponding to shear layer mode (St ¿ =0.012) and preferred mode (St D =0.36). The nozzle exit boundary layer was identical for the unexcited and excited flows. Measurements of mean velocity, longitudinal and lateral velocity fluctuations, Reynolds shear stress and spanwise component of fluctuating vorticity were made over a longitudinal distance x/D of 6 for both the unexcited and the excited flows. Even weak excitation was observed to influence the development of the mixing layer. Under shear layer mode of excitation, the width of the layer and longitudinal turbulence level decrease compared to the naturally developing (unexcited) flow whereas preferred mode of excitation results in increase in the width and turbulence levels. The rms spanwise vorticity showed an increase for shear layer mode of excitation whereas the preferred mode of excitation resulted in a decrease compared to the values in an unexcited flow. Spectra of velocity and vorticity fluctuations exhibited subharmonic peaks, suggesting the possible occurrence of vortex pairing in both unexpected and excited flows. The influence of excitation is found to decrease as x/D increases and is not significant at x/D=6. © 1996 Springer-Verlag.

DOI 10.1007/BF00191016
Citations Scopus - 6
1993 RAJAGOPALAN S, ANTONIA RA, 'RMS SPANWISE VORTICITY MEASUREMENTS IN A TURBULENT BOUNDARY-LAYER', EXPERIMENTS IN FLUIDS, 14 142-144 (1993)
Citations Scopus - 17Web of Science - 18
Co-authors Robert Antonia
1993 RAJAGOPALAN S, ANTONIA RA, 'STRUCTURE OF THE VELOCITY-FIELD ASSOCIATED WITH THE SPANWISE VORTICITY IN THE WALL REGION OF A TURBULENT BOUNDARY-LAYER', PHYSICS OF FLUIDS A-FLUID DYNAMICS, 5 2502-2510 (1993)
DOI 10.1063/1.858763
Citations Scopus - 25Web of Science - 24
Co-authors Robert Antonia
1991 Raupach MR, Antonia RA, Rajagopalan S, 'Rough-wall turbulent boundary layers', Applied Mechanics Reviews, 44 1-26 (1991)

This review considers theoretical and experimental knowledge of rough-wall turbulent boundary layers, drawing from both laboratory and atmospheric data. The former apply mainly to... [more]

This review considers theoretical and experimental knowledge of rough-wall turbulent boundary layers, drawing from both laboratory and atmospheric data. The former apply mainly to the region above the roughness sublayer (in which the roughness has a direct dynamical influence) whereas the latter resolve the structure of the roughness sublayer in some detail. Topics considered include the drag properties of rough surfaces as functions of the roughness geometry, the mean and turbulent velocity fields above the roughness sublayer, the properties of the flow close to and within the roughness canopy, and the nature of the organized motion in rough-wall boundary layers. Overall, there is strong support for the hypothesis of wall similarity: At sufficiently high Reynolds numbers, rough-wall and smooth-wall boundary layers have the same turbulence structure above the roughness (or viscous) sublayer, scaling with height, boundary-layer thickness, and friction velocity. © 1991 American Society of Mechanical Engineers.

DOI 10.1115/1.3119492
Citations Scopus - 712
Co-authors Robert Antonia
1990 ANTONIA RA, RAJAGOPALAN S, 'DETERMINATION OF DRAG OF A CIRCULAR-CYLINDER', AIAA JOURNAL, 28 1833-1834 (1990)
DOI 10.2514/3.10485
Citations Scopus - 54Web of Science - 41
Co-authors Robert Antonia
1990 ANTONIA RA, RAJAGOPALAN S, 'PERFORMANCE OF LATERAL VORTICITY PROBE IN A TURBULENT WAKE', EXPERIMENTS IN FLUIDS, 9 118-120 (1990)
Citations Scopus - 13Web of Science - 15
Co-authors Robert Antonia
1984 Luxton RE, Bull MK, Rajagopalan S, 'THICK TURBULENT BOUNDRAY LAYER ON A LONG FINE CYLINDER IN AXIAL FLOW.', Aeronautical Journal, 88 186-199 (1984)

Transverse curvature effects in axisymmetric flow on a circular cylinder are discussed. It is deduced that for small delta /a, where delta is the boundary layer thickness and a is... [more]

Transverse curvature effects in axisymmetric flow on a circular cylinder are discussed. It is deduced that for small delta /a, where delta is the boundary layer thickness and a is the cylinder radius, transverse curvature effects are small, for delta /a equals 0(1) the effect is felt mainly in the outer region and for delta /a VM GT TH 1, both the inner and the outer regions are affected. It is argued that the last case can only be achieved experimentally in the laboratory if the radius Reynolds number R//a equals U//1a/v is small and the streamwise Reynolds number R//x equals U//1x/v is large, implying x/a large. New experimental data are presented for this case. The data show that both the mean and turbulent flow field scale on outer variables throughout the layer and, for R//a greater than equivalent to 455, exhibit Reynolds number independence.

Citations Scopus - 34
1984 RAJAGOPALAN S, ANTONIA RA, 'CONDITIONAL AVERAGES ASSOCIATED WITH THE FINE-STRUCTURE IN A TURBULENT BOUNDARY-LAYER', PHYSICS OF FLUIDS, 27 1966-1973 (1984)
DOI 10.1063/1.864851
Citations Scopus - 3Web of Science - 3
Co-authors Robert Antonia
1984 Antonia RA, Chambers AJ, Browne LWB, Rajagopalan S, 'ORGANISED STRUCTURE IN A SLIGHTLY HEATED TURBULENT PLANE JET. 529-534 (1984)

Two-point correlations of temperature fluctuations confirm the existence, in the self-preserving region of a plane jet, of spanwise structures, occurring alternately on opposite s... [more]

Two-point correlations of temperature fluctuations confirm the existence, in the self-preserving region of a plane jet, of spanwise structures, occurring alternately on opposite sides of the centreline. Conditional averages of temperature fluctuations are computed using a selection procedure based on information obtained at several points in space. The averages are compared with those obtained when the selection is based on information at one point in space.

Citations Scopus - 2
Co-authors Robert Antonia
1984 Antonia RA, Rajagopalan S, Fulachier L, 'Comparison of temperature and velocity spectra in a slightly heated turbulent plane jet', AIAA Journal, 22 311-313 (1984)
DOI 10.2514/3.8390
Citations Scopus - 3
Co-authors Robert Antonia
1983 ANTONIA RA, BROWNE LWB, CHAMBERS AJ, RAJAGOPALAN S, 'BUDGET OF THE TEMPERATURE VARIANCE IN A TURBULENT PLANE JET', INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 26 41-48 (1983)
DOI 10.1016/S0017-9310(83)80006-4
Citations Scopus - 38Web of Science - 34
Co-authors Robert Antonia
1983 ANTONIA RA, BROWNE LWB, RAJAGOPALAN S, CHAMBERS AJ, 'ON THE ORGANIZED MOTION OF A TURBULENT PLANE JET', JOURNAL OF FLUID MECHANICS, 134 49-66 (1983)
DOI 10.1017/S0022112083003213
Citations Scopus - 51Web of Science - 81
Co-authors Robert Antonia
1983 ANTONIA RA, RAJAGOPALAN S, CHAMBERS AJ, 'CONDITIONAL SAMPLING OF TURBULENCE IN THE ATMOSPHERIC SURFACE-LAYER', JOURNAL OF CLIMATE AND APPLIED METEOROLOGY, 22 69-78 (1983)
DOI 10.1175/1520-0450(1983)022<0069:CSOTIT>2.0.CO;2
Citations Scopus - 17Web of Science - 19
Co-authors Robert Antonia
1983 BROWNE LWB, ANTONIA RA, RAJAGOPALAN S, 'THE SPATIAL DERIVATIVE OF TEMPERATURE IN A TURBULENT-FLOW AND TAYLORS HYPOTHESIS', PHYSICS OF FLUIDS, 26 1222-1227 (1983)
DOI 10.1063/1.864271
Citations Scopus - 26Web of Science - 32
Co-authors Robert Antonia
1982 ANTONIA RA, RAJAGOPALAN S, SUBRAMANIAN CS, CHAMBERS AJ, 'REYNOLDS-NUMBER DEPENDENCE OF THE STRUCTURE OF A TURBULENT BOUNDARY-LAYER', JOURNAL OF FLUID MECHANICS, 121 123-140 (1982)
DOI 10.1017/S0022112082001827
Citations Scopus - 22Web of Science - 21
Co-authors Robert Antonia
1982 SUBRAMANIAN CS, RAJAGOPALAN S, ANTONIA RA, CHAMBERS AJ, 'COMPARISON OF CONDITIONAL SAMPLING AND AVERAGING TECHNIQUES IN A TURBULENT BOUNDARY-LAYER', JOURNAL OF FLUID MECHANICS, 123 335-362 (1982)
DOI 10.1017/S0022112082003097
Citations Scopus - 41Web of Science - 46
Co-authors Robert Antonia
1982 RAJAGOPALAN S, ANTONIA RA, 'USE OF A QUADRANT ANALYSIS TECHNIQUE TO IDENTIFY COHERENT STRUCTURES IN A TURBULENT BOUNDARY-LAYER', PHYSICS OF FLUIDS, 25 949-956 (1982)
DOI 10.1063/1.863848
Citations Scopus - 9Web of Science - 8
Co-authors Robert Antonia
1982 RAJAGOPALAN S, SUBRAMANIAN CS, ANTONIA RA, CHAMBERS AJ, 'SPANWISE CORRELATION OF TEMPERATURE IN A TURBULENT BOUNDARY-LAYER', PHYSICS OF FLUIDS, 25 1144-1145 (1982)
DOI 10.1063/1.863870
Citations Scopus - 2Web of Science - 2
Co-authors Robert Antonia
1982 ANTONIA RA, RAJAGOPALAN S, BROWNE LWB, CHAMBERS AJ, 'CORRELATIONS OF SQUARED VELOCITY AND TEMPERATURE DERIVATIVES IN A TURBULENT PLANE JET', PHYSICS OF FLUIDS, 25 1156-1158 (1982)
DOI 10.1063/1.863881
Citations Scopus - 7Web of Science - 8
Co-authors Robert Antonia
1981 PHANTHIEN N, ANTONIA RA, RAJAGOPALAN S, 'PERTURBATION SOLUTION FOR FLOW BETWEEN A ROTATING-DISK AND A PARALLEL STATIONARY PLATE', JOURNAL DE MECANIQUE, 20 617-625 (1981)
Co-authors Robert Antonia
1981 RAJAGOPALAN S, ANTONIA RA, 'PROPERTIES OF THE LARGE STRUCTURE IN A SLIGHTLY HEATED TURBULENT MIXING LAYER OF A PLANE JET', JOURNAL OF FLUID MECHANICS, 105 261-281 (1981)
DOI 10.1017/S0022112081003200
Citations Scopus - 19Web of Science - 16
Co-authors Robert Antonia
1980 RAJAGOPALAN S, ANTONIA RA, 'CHARACTERISTICS OF A MIXING LAYER OF A TWO-DIMENSIONAL TURBULENT JET', AIAA JOURNAL, 18 1052-1058 (1980)
DOI 10.2514/3.7709
Citations Scopus - 3Web of Science - 4
Co-authors Robert Antonia
1980 PHONGANANT D, ANTONIA RA, CHAMBERS AJ, RAJAGOPALAN S, 'FEATURES OF THE ORGANIZED MOTION IN THE ATMOSPHERIC SURFACE-LAYER', JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 85 424-432 (1980)
DOI 10.1029/JC085iC01p00424
Citations Scopus - 9Web of Science - 19
Co-authors Robert Antonia
1980 RAJAGOPALAN S, ANTONIA RA, 'INTERACTION BETWEEN LARGE AND SMALL-SCALE MOTIONS IN A TWO-DIMENSIONAL TURBULENT DUCT FLOW', PHYSICS OF FLUIDS, 23 1101-1110 (1980)
DOI 10.1063/1.863112
Citations Scopus - 8Web of Science - 8
Co-authors Robert Antonia
1980 RAJAGOPALAN S, ANTONIA RA, 'INVESTIGATION OF NATURAL TRANSITION IN THE INLET REGION OF A TWO-DIMENSIONAL DUCT FLOW', PHYSICS OF FLUIDS, 23 1938-1948 (1980)
DOI 10.1063/1.862883
Citations Scopus - 5Web of Science - 4
Co-authors Robert Antonia
1980 Phong A, Antonia RA, Chambers AJ, Rajagopalan S, 'FEATURES OF THE ORGANIZED MOTION IN THE ATMOSPHERIC SURFACE LAYER.', Journal of Geophysical Research, 85 424-432 (1980)

Simultaneous temperature traces at several heights in the first 8 m of the atmospheric surface layer indicate the presence of an organized structure with a spatially coherent upwi... [more]

Simultaneous temperature traces at several heights in the first 8 m of the atmospheric surface layer indicate the presence of an organized structure with a spatially coherent upwind interface characterized by a sharp decrease in temperature. The convection speed of this interface, obtained by different methods, increases with height and is approximately equal to the local mean wind velocity. The inclination of this interface to the horizontal also increases with height. Associated with the sharp decrease in temperature theta at the interface is a relatively less sharp jump in streamwise u and a decrease in vertical w velocity fluctuations. Ensemble-averaged distribution of u, w, theta , and w theta , relative to the location of the interface, have been obtained for several occurrences of the interface for different stability conditions.

Citations Scopus - 26
Co-authors Robert Antonia
1980 Rajagopalan S, Antonia RA, 'Large structure in a heated turbulent mixing layer.', IN: PROC. 7TH AUSTRALASIAN CONF. ON HYDRAULICS & FLUID MECHANICS, PREPRINTS OF PAPERS, (BRISBANE, AUSTRALIA: AUG. 18-22, 1980, 505-508 (1980)
Co-authors Robert Antonia
1979 ANTONIA RA, CHAMBERS AJ, PHONGANANT D, RAJAGOPALAN S, 'PROPERTIES OF SPATIAL TEMPERATURE DERIVATIVES IN THE ATMOSPHERIC SURFACE-LAYER', BOUNDARY-LAYER METEOROLOGY, 17 101-118 (1979)
DOI 10.1007/BF00121939
Citations Scopus - 14Web of Science - 15
Co-authors Robert Antonia
1979 ANTONIA RA, CHAMBERS AJ, PHONGANANT D, RAJAGOPALAN S, SREENIVASAN KR, 'RESPONSE OF ATMOSPHERIC SURFACE-LAYER TURBULENCE TO A PARTIAL SOLAR ECLIPSE', JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 84 1689-1692 (1979)
DOI 10.1029/JC084iC04p01689
Citations Web of Science - 25
Co-authors Robert Antonia
1979 RAJAGOPALAN S, ANTONIA RA, 'SOME PROPERTIES OF THE LARGE STRUCTURE IN A FULLY-DEVELOPED TURBULENT DUCT FLOW', PHYSICS OF FLUIDS, 22 614-622 (1979)
DOI 10.1063/1.862643
Citations Scopus - 23Web of Science - 29
Co-authors Robert Antonia
1978 ANTONIA RA, CHAMBERS AJ, RAJAGOPALAN S, SREENIVASAN KR, FRIEHE CA, 'MEASUREMENTS OF TURBULENT FLUXES IN BASS STRAIT', JOURNAL OF PHYSICAL OCEANOGRAPHY, 8 28-37 (1978)
DOI 10.1175/1520-0485(1978)008<0028:MOTFIB>2.0.CO;2
Citations Web of Science - 15
Co-authors Robert Antonia
1978 Antonia RA, Chambers AJ, Rajagopalan S, Screenivasan KR, 'Measurements of turbulent fluxes in Bass Strait.', Journal of Physical Oceanography, 8 28-37 (1978)

Friehe,C Measurements of turbulent momentum, heat and moisture fluxes have been made in Bass Strait from a stable platform, at a height of approximately 5 m above water. Direct me... [more]

Friehe,C Measurements of turbulent momentum, heat and moisture fluxes have been made in Bass Strait from a stable platform, at a height of approximately 5 m above water. Direct measurements of these fluxes are compared with estimates obtained from spectra of velocity, temperature and humidity fluctuations with the use of the inertial dissipation technique. Directly measured momentum and moisture flux values are in reasonable agreement with inertial dissipation values. Thesensible heat flux obtained by the inertial dissipation technique is about twice as large as the directly measured heat flux. The dependence on wind speed of bulk transfer coefficients of momentum, heat and moisture and of variances of velocity and scalar fluctuations is discussed and compared with available data. (A)

Citations Scopus - 11
Co-authors Robert Antonia
1977 Narayanan MAB, Rajagopalan S, Narasimha R, 'Experiments on the fine structure of turbulence', Journal of Fluid Mechanics, 80 237-257 (1977)

Investigations have been carried out of some aspects of the fine-scale structure of turbulence in grid flows, in boundary layers in a zero pressure gradient and in a boundary laye... [more]

Investigations have been carried out of some aspects of the fine-scale structure of turbulence in grid flows, in boundary layers in a zero pressure gradient and in a boundary layer in a strong favourable pressure gradient leading to relaminarization. Using a narrow-band filter with suitable mid-band frequencies, the properties of the fine-scale structure (appearing as high frequency pulses in the filtered signal) were analysed using the variable discriminator level technique employed earlier by Rao, Narasimha & Badri Narayanan (1971). It was found that, irrespective of the type of flow, the characteristic pulse frequency (say N p ) defined by Rao et al. was about 0.6 times the frequency of the zero crossings. It was also found that, over the small range of Reynolds numbers tested, the ratio of the width of the fine-scale regions to the Kolmogorov scale increased linearly with Reynolds number in grid turbulence as well as in flat-plate boundarylayer flow. Nearly lognormal distributions were exhibited by this ratio as well as by the interval between successive zero crossings. The values of N p and of the zero-crossing rate were found to be nearly constant across the boundary layer, except towards its outer edge and very near the wall. In the zero-pressure-gradient boundary-layer flow, very near the wall the high frequency pulses were found to occur mostly when the longitudinal velocity fluctuation u was positive (i.e. above the mean), whereas in the outer part of the boundary layer the pulses more often occurred when u was negative. During acceleration this correlation between the fine-scale motion and the sign of u was less marked. © 1977, Cambridge University Press. All rights reserved.

DOI 10.1017/S0022112077001657
Citations Scopus - 24
Browne LWB, Antonia RA, Rajagopalan S, Chambers AJ, 'Interaction region of a two-dimensional turbulent plane jet in still air.

The paper describes an experimental study to investigate the velocity and temperature fields in the interaction region of a two dimensional turbulent plane jet in still air. The e... [more]

The paper describes an experimental study to investigate the velocity and temperature fields in the interaction region of a two dimensional turbulent plane jet in still air. The experimental procedure is briefly described and the velocity and temperature variations plotted on graphs. A discussion is made, and conclusions proposed, as the link between the coherent structures observed in the mixing layer and those that were found in the self preserving far field. (A.J.)

Co-authors Robert Antonia
Show 48 more journal articles

Review (1 outputs)

Year Citation Altmetrics Link
1999 Olsen JF, Rajagopalan SR, Antonia RA, 'Control of Jet Turbulence', Recent Research Developments in Fluid Dynamics Vol. 2 (1999) [D1]
Co-authors Robert Antonia

Conference (24 outputs)

Year Citation Altmetrics Link
2011 Lee S-K, Djenidi L, Antonia RA, Rajagopalan SR, 'Spectrum of a passive scalar in stretched grid turbulence at low Reynolds numbers', Journal of Physics: Conference Series (2011) [E1]
DOI 10.1088/1742-6596/318/5/052046
Co-authors Robert Antonia, Lyazid Djenidi
2007 Hanson RE, Rajagopalan SR, Antonia RA, 'Characteristics of the wake of tandem cylinders with different and equal diameters', Collection of Technical Papers: 37th AIAA Fluid Dynamics Conference (2007) [E2]
Co-authors Robert Antonia
2006 Rajagopalan SR, Antonia RA, 'Turbulence and drag control in jet and wake flows', Proceedings of the discussion meeting on flow control and diagnostics (2006) [E1]
Co-authors Robert Antonia
2006 Parker R, Lavoie PLD, Rajagopalan SR, Antonia RA, 'Mixing layer excitation in an axisymmetric jet using piezoelectric actuators', European drag reduction and flow control meeting (2006) [E1]
Co-authors Robert Antonia
2006 Rajagopalan SR, 'Passive Control of an Axisymmetric Jet Using Grids', NCFMFP 2006 (CD-Rom) (2006) [E1]
2004 Burattini P, Antonia RA, Rajagopalan SR, 'Effect of initial conditions on the far field of a round jet', Proceedings of the Fifteenth Australasian Fluid Mechanics Conference (2004) [E1]
Co-authors Robert Antonia
2004 Lehman RP, Rajagopalan SR, Burattini P, Antonia RA, 'Axisymmetric jet control using passive grids', Proceedings of the Fifteenth Australasian Fluid Mechanics Conference (2004) [E1]
Co-authors Robert Antonia
2004 Stephens ML, Rajagopalan SR, Burattini P, Antonia RA, 'Axisymmetric shear flow behind a honeycomb', Proceedings of The Tenth Asian Congress of Fluid Mechanics (2004) [E1]
Co-authors Robert Antonia
2003 Olsen JF, Rajagopalan SR, Antonia RA, 'Preferred Modes and Jet Column Modes in a Plane Jet and in a Passively Modified Plane Jet', Turbulence, Heat and Mass Transfer (2003) [E2]
Co-authors Robert Antonia
2001 Parker R, Rajagopalan SR, Antonia RA, 'Control of an Axisymmetric Jet using a Passive Ring', Proceedings of the Fourteenth Australasian Fluid Mechanics Conference Volume II (2001) [E1]
Citations Scopus - 11Web of Science - 7
Co-authors Robert Antonia
2001 Grubb C, Rajagopalan SR, 'The Influence of the Nozzle Outlet Shape on Swirl Flow', Proceedings of the Fourteenth Australasian Fluid Mechanics Conference (2001) [E1]
2001 Parker R, Antonia RA, Rajagopalan SR, 'Turbulence control in a plane jet using a piezoelectric excitation device', Turbulence and Shear Flow Phenomena Volume II (2001) [E2]
Co-authors Robert Antonia
1999 Olsen JF, Rajagopalan SR, Antonia RA, 'Turbulence Reduction in the Initial Region of a Plane Jet Using Passive Control', IUTAM Symposium on Mechanics of Passive and Active Flow Control (1999) [E1]
Citations Web of Science - 1
Co-authors Robert Antonia
1999 Xu G, Antonia RA, Rajagopalan SR, 'Scaling of Mixed Longitudinal-Transverse Velocity Structure Functions', Proceedings of the Eighth Asian Congress of Fluid Mechanics (1999) [E1]
Co-authors Robert Antonia
1999 Henry P, Olsen JF, Rajagopalan SR, 'Passive control of shear layer turbulence in a plane jet', Proceedings of the Eighth Asian Congress of Fluid Mechanics (1999) [E1]
1998 Grubb C, Rajagopalan SR, 'Investigations of a Plane Lip Jet From a Narrow Slit', Proceedings of 13th Australasian Fluid Mechanics Conference (2 volumes) (1998) [E1]
1998 Tam YS, Olsen JF, Rajagopalan SR, 'Feedback Control of Vortex Shedding From a Circular Cylinder', Proceedings of 13th Australasian Fluid Mechanics Conference (2 volumes) (1998) [E1]
1998 Olsen JF, Rajagopalan SR, 'Hot Wire Measurements in the Wake of Modified Circular Cylinders', Proceedings of the 13th Australasian Fluid Mechanics Conference (2 volumes) (1998) [E1]
1998 Xu G, Antonia RA, Rajagopalan SR, 'The Sweeping DEcorrelation Hypothesis and Anisotropy in a Turbulent Jet at Moderate Reynolds Numbers', Proceedings of the 13th Australasian Fluid Mechanics Conference (2 volumes) (1998) [E1]
Co-authors Robert Antonia
1992 RAJAGOPALAN S, WONG KT, 'DEVELOPMENT OF THE MIXING LAYER OF A PLANE JET UNDER ACOUSTIC EXCITATION', ELEVENTH AUSTRALASIAN FLUID MECHANICS CONFERENCE, VOLS 1 AND 2 (1992)
1992 RAJAGOPALAN S, ANTONIA RA, 'STRUCTURE OF SPANWISE VORTICITY IN A LOW REYNOLDS NUMBER TURBULENT BOUNDARY LAYER', ELEVENTH AUSTRALASIAN FLUID MECHANICS CONFERENCE, VOLS 1 AND 2 (1992)
Co-authors Robert Antonia
1983 Rajagopalan S, Antonia RA, 'SOME ASPECTS OF THE FINE STRUCTURE IN A TURBULENT BOUNDARY LAYER.' (1983)
Co-authors Robert Antonia
1982 Antonia RA, Subramanian CS, Rajagopalan S, Chambers AJ, 'REYNOLDS NUMBER DEPENDENCE OF THE LARGE STRUCTURE IN A SLIGHTLY HEATED TURBULENT BOUNDARY LAYER.', Proceedings of the International Centre for Heat and Mass Transfer (1982)
Citations Scopus - 1
Co-authors Robert Antonia
1980 Rajagopalan S, Antonia RA, 'LARGE STRUCTURE IN A HEATED TURBULENT MIXING LAYER.', National Conference Publication - Institution of Engineers, Australia (1980)
Co-authors Robert Antonia
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Grants and Funding

Summary

Number of grants 16
Total funding $608,728

Click on a grant title below to expand the full details for that specific grant.


20061 grants / $1,600

Workshop on Flow Control and Diagnostics$1,600

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Travel Grant
Role Lead
Funding Start 2006
Funding Finish 2006
GNo G0186133
Type Of Funding Internal
Category INTE
UON Y

20051 grants / $3,311

Active Control of Cylinder Wake Shear Layer Dynamics$3,311

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Lead
Funding Start 2005
Funding Finish 2005
GNo G0184683
Type Of Funding Internal
Category INTE
UON Y

20041 grants / $4,714

Influence of nozzle shape on synthetic jets$4,714

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Lead
Funding Start 2004
Funding Finish 2004
GNo G0183413
Type Of Funding Internal
Category INTE
UON Y

20031 grants / $5,792

Control of turbulent flows.$5,792

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Professor Lyazid Djenidi, Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Investigator
Funding Start 2003
Funding Finish 2003
GNo G0182404
Type Of Funding Internal
Category INTE
UON Y

20021 grants / $9,609

Reverse and bi-directional swirl jet flow from tangential injection nozzles$9,609

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Lead
Funding Start 2002
Funding Finish 2002
GNo G0181414
Type Of Funding Internal
Category INTE
UON Y

20012 grants / $6,313

Jet Flow Control using Piezoelectric Smart Structures.$5,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Lead
Funding Start 2001
Funding Finish 2001
GNo G0179956
Type Of Funding Internal
Category INTE
UON Y

14 Australasian Fluid Mechanics Conference Adelaide 9-14 December, 2001$1,313

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Travel Grant
Role Lead
Funding Start 2001
Funding Finish 2001
GNo G0181576
Type Of Funding Internal
Category INTE
UON Y

20001 grants / $10,000

Control of mixing in a circular jet using a vortex generating spiral jet.$10,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Lead
Funding Start 2000
Funding Finish 2000
GNo G0178944
Type Of Funding Internal
Category INTE
UON Y

19992 grants / $175,335

Management of Turbulent Shear Flows$174,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Professor Robert Antonia, Professor Lyazid Djenidi, Conjoint Associate Professor Raj Rajagopalan
Scheme Large Grant
Role Investigator
Funding Start 1999
Funding Finish 2001
GNo G0177756
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

8th asian Congress on Fluid Mechanics, Shenzhen, China.$1,335

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Travel Grant
Role Lead
Funding Start 1999
Funding Finish 1999
GNo G0180507
Type Of Funding Internal
Category INTE
UON Y

19972 grants / $11,075

Passive and Active Control of a Plane Turbulent Jet.$10,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan, Emeritus Professor Robert Antonia
Scheme Project Grant
Role Lead
Funding Start 1997
Funding Finish 1997
GNo G0176713
Type Of Funding Internal
Category INTE
UON Y

Seventh Asian Congress of Fluid Mechanics (Triennial), Madras, India, 8-12 December 1997$1,075

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Travel Grant
Role Lead
Funding Start 1997
Funding Finish 1997
GNo G0179549
Type Of Funding Internal
Category INTE
UON Y

19961 grants / $200,000

EFECTS OF DIFFERENT SURFACE CONDITIONS ON A TURBULENT BOUNDARY LAYER$200,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Professor Robert Antonia, Professor Lyazid Djenidi, Conjoint Associate Professor Raj Rajagopalan
Scheme Large Grant
Role Investigator
Funding Start 1996
Funding Finish 1998
GNo G0175285
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

19951 grants / $9,000

Three Component Vorticity Measurements in a Large Reynolds Number Jet$9,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan, Emeritus Professor Robert Antonia
Scheme Project Grant
Role Lead
Funding Start 1995
Funding Finish 1995
GNo G0174976
Type Of Funding Internal
Category INTE
UON Y

19931 grants / $161,979

93,94,95 GRANT. Turbulent Boundary Layer over Riblets.$161,979

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Professor Robert Antonia, Conjoint Associate Professor Raj Rajagopalan
Scheme Large Grant
Role Investigator
Funding Start 1993
Funding Finish 1995
GNo G0173028
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

19921 grants / $10,000

Investigation Of Drag And Reduction In A Turbulent Boudnary Layer Using Riblets$10,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Conjoint Associate Professor Raj Rajagopalan
Scheme Project Grant
Role Lead
Funding Start 1992
Funding Finish 1992
GNo G0174203
Type Of Funding Internal
Category INTE
UON Y
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Research Supervision

Number of supervisions

Completed3
Current0

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2008 Masters Lattice Boltzmann Simulation of Fluid Mixing in T-Shaped Micromixer M Eng (Mechanical) [R], Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2007 PhD Turbulence Control in Jet Flow PhD (Mechanical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Sole Supervisor
2003 PhD Swirl Jet from a Tangential Injection Nozzle PhD (Mechanical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Sole Supervisor
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Conjoint Associate Professor Raj Rajagopalan

Position

Conjoint Associate Professor
School of Engineering
Faculty of Engineering and Built Environment

Focus area

Mechanical Engineering

Contact Details

Email sundara.rajagopalan@newcastle.edu.au
Phone (02) 4921 6201

Office

Room ES430
Building Engineering S
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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