71 citations · 257 across the 16 of their papers we have counts for
16 papers
Effects of surface roughness on the propulsive performance of pitching foils
Rodrigo Vilumbrales-Garcia, Melike Kurt, Gabriel D. Weymouth +1
The hydrodynamic influence of surface texture on static surfaces ranges from large drag penalties (roughness) to potential performance benefits (shark-like skin). Although, it is o…
Effects of porous substrates on the structure of turbulent boundary layers
Prateek Jaiswal, Bharathram Ganapathisubramani
Three different porous substrates (with different pore sizes, s, and permeabilities, K) are used to examine their effect on the structure of boundary layer flow over them. The flow…
Scaling of secondary flows with surface parameters: a linear approach
Gerardo Zampino, Davide Lasagna, Bharathram Ganapathisubramani
Secondary flows are generated when a lateral variation of the topography, such as streamwise aligned ridges, is imposed to a turbulent wall-bounded flow. In this case, the flow fie…
A systematic investigation into the effect of roughness on self-propelled swimming plates
Jonathan Massey, Bharathram Ganapathisubramani, Gabriel Weymouth
This study examines the effects of surface topography on the flow and performance of a Self-Propelled Swimming (SPS) body. We consider a thin flat plate with an egg-carton roughnes…
The influence of freestream turbulence on the development of a wind turbine wake
Stefano Gambuzza, Bharathram Ganapathisubramani
The wake of an isolated model-scale wind turbine is analysed in a set of inflow conditions having freestream turbulence intensity between 3 % and 12 %, and integral time scales in…
Linearised Reynolds-Averaged predictions of secondary currents in turbulent channels with topographic heterogeneity
Gerardo Zampino, Davide Lasagna, Bharathram Ganapathisubramani
A rapid predictive tool based on the linearised Reynolds-averaged Navier-Stokes equations is proposed in this work to investigate secondary currents generated by streamwise-indepen…
Time-averaged velocity and scalar fields of the flow surrounding a group of cylinders
Dea Daniella Wangsawijaya, Claudia Nicolai, Bharathram Ganapathisubramani
We examine the characteristics of mean flow and scalar concentration characteristics of a turbulent boundary layer flow impinging on a cluster of tall obstacles (which can also be…
Settling behaviour of thin curved particles in quiescent fluid and turbulence
Timothy T. K. Chan, Luis Blay Esteban, Sander G. Huisman +2
The motion of thin curved falling particles is ubiquitous in both nature and industry but is not yet widely examined. Here, we describe an experimental study on the dynamics of thi…
Effects of Aspect Ratio on Rolling and Twisting Foils
A. N. Zurman-Nasution, B. Ganapathisubramani, G. D. Weymouth
Flapping flight and swimming are increasingly studied both due to their intrinsic scientific richness and their applicability to novel robotic systems. Strip theory is often applie…
Deflected Wake Interaction of Tandem Flapping Foils
N. S. Lagopoulos, G. D. Weymouth, B. Ganapathisubramani
Symmetric flapping foils are known to produce deflected jets at high frequency-amplitude combinations even at a zero mean angle of attack. This reduces the frequency range of usefu…
Universal scaling law in drag-to-thrust wake transition of flapping foils
N. S. Lagopoulos, G. D. Weymouth, B. Ganapathisubramani
Reversed von Kármán streets are responsible for a velocity surplus in the wake of flapping foils, indicating the onset of thrust generation. However, the wake pattern cannot be pre…
On the decay of dispersive motions in the outer region of rough-wall boundary layers
Johan Meyers, Bharathram Ganapathisubramani, Raúl Bayoán Cal
In rough-wall boundary layers, wall-parallel non-homogeneous mean-flow solutions exist that lead to so-called dispersive velocity components and dispersive stresses. They play a si…
Law-of-the-wall for streamwise energy spectra in high-Reynolds-number turbulent boundary layers
B. Ganapathisubramani
A scaling relation for the high frequency regime of streamwise energy spectra (in frequency domain) in the near-wall region is proposed. This is based on the dimensional analysis a…
Entrainment effects in periodic forcing of the flow over a backward-facing step
Tim Berk, Takfarinas Medjnoun, Bharathram Ganapathisubramani
The effect of the Strouhal number on periodic forcing of the flow over a backward-facing step (height, ) is investigated experimentally. Forcing is applied by a synthetic jet at…
Exact coherent states for grooved Couette flows
Sabarish Vadarevu, Ati Sharma, Bharathram Ganapathisubramani
Recent progress indicates that highly symmetric recurring solutions of the Navier-Stokes equations, such as equilibria and periodic orbits, provide a skeleton for turbulence dynami…
Limitations of estimating turbulent convection velocities from PIV
Roeland de Kat, Lian Gan, James R Dawson +1
This paper deals with determination of turbulent convection velocities from particle image velocimetry (PIV). Turbulent convection velocities are of interest because they can be us…