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Hemmati, Arman

Bio

I completed my B.Sc. in Mechanical Engineering at the University of Calgary with an emphasis on aerodynamics and alternative energy systems in 2011. Following my undergraduate studies, I started working on my doctoral thesis under the supervision of Prof. David Wood at the University of Calgary. My doctoral thesis focused on Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) of the wake of sharp-edge flat bodies representing wind loads on Photovoltaic (PV) modules. This study looked at the fundamentals of the formation and interaction of vortex structures in the wake of flat panels at high angles of attack, and evaluated the implications of vortex dynamics on surface pressure variations and aerodynamic force fluctuations. I also worked on several experimental and numerical studies related to wind turbine tail fins, insect flight aerodynamics, vehicle aerodynamics and wind engineering. Upon completion of my PhD, I joined the Gas Dynamics Laboratory at Princeton University as a Post-Doctoral Research Fellow to work with Prof. Lex Smits. My research at Princeton focused on the development of the next generation of propulsors with higher efficiency and thrust than conventional systems using inspiration from fish. In collaboration with biologists at partnering universities, I used IBM integrated to DNS to investigate the hydrodynamics of various tail fin shapes, oscillatory motions and their implications on the performance of propulsors and energy extractors. This project, and my collaboration with the Gas Dynamics Laboratory, is ongoing with the objective of preparing a realistic high performance energy extractor prototype. 

Hemmati, Arman

Publications, Activities, and Awards

  • Asymmetry in wake of oscillating foils with combined pitching and heaving motion
  • Benchmark Study of RANS Turbulence Modeling of Pipeflow Past Square Bar Roughness
  • Can we use the swimming habits of fish for energy harvesting in rivers?
  • Climate Change, Technology and Policy
  • Coherent structures in the wake of a large depth-ratio wall-mounted rectangular cylinder at high incidence angles
  • Effects of trailing edge shape on vortex formation by pitching panels of small aspect ratio
  • Enhanced performance of two-staged vertical axis wind turbines based on bioinspiration from fish school
  • Evolution of turbulent pipeflow recovery over a square bar roughtness element over a range of Reynolds numbers
  • How are the wake dynamics altered by abrupt changes to the oscillation phase angle?
  • Implications of outlet boundary condition on simulating blood flow in a paediatric healthy aorta
  • Implications of reduced frequency on wake structure of tandem in-line foils
  • Implicationsof the trailing edge on swimming performance of Heaving panels
  • Larger wavelengths suit the hydrodynamics of carangiform swimmers
  • Microscale Underwater Energy Harvesting
  • Mid-cycle phase variations lead to higher stability in swimming fish with side-by-side configuration
  • Non-Newtonian effects in pipeflow with square bar roughness at moderate Reynolds numbers
  • On the performance scaling of oscillating foils with combined heaving and pitching motions
  • Performance of Overset Mesh in modelling generic wakes for underwater swimming
  • Performance of Overset Mesh in Modelling Generic Wakes of sharp-edge bodies
  • Performance of Turbulence models in modeling pipe flow with small perturbations at a range of Reynolds numbers
  • Performance of turbulence models in simulating wind loads on Photovoltaics modules
  • Recovery of viscoelastic turbulent pipeflow past square bar roughness
  • Reynolds number effects on the wake structures of pitching panels of small aspect ratio
  • Scaling the performance of hydrofoils with combined pitching and heaving motion in underwater swimming
  • Secondary spanwise structures in the wake of oscillating foils
  • Secondary structures in the wake of simultaneously heaving and pitching foils
  • The effect of depth-ratio on the wake of long-rectangular cylinders
  • The effect of multiple square bar roughness in reducing drag in pipeflow at high Reynolds numbers
  • The effect of pitching frequency on the hydrodynamics of oscillating foils
  • The effect of single dielectric barrier discharge actuators in controlling flow over an Ahmed body
  • The effect of Strouhal number and Reynolds number on the wake of pitching panels in underwater swimming
  • The evolution of large-scale structures in the wake of oscillating teardrop foils
  • The evolution of secondary structures in the presence of interacting wakes: tandem side-by-side foils
  • The implications of aorta anomalies in blood flow manipulation in paediatric subjects
  • The implications of separation distance and phase angle on wake dynamics of parallel pitching foils
  • The implications of wake symmetry on the performance of tandem pitching hydrofoils in side-by-side configuration
  • The propulsive performance of side-by-side foils at a range of Re and St
  • The recovery of turbulent pipeflow dynamics depend on the targeted wall geometries at high Reynolds number
  • The Response of Modified Turbulent Pipe-Flow Targeting Distinct Fourier Modes at a Range of Reynolds Numbers.
  • The response of turbulent pipeflow to targeted wall changes for viscous flows
  • The scaling of propulsive performance of tandem pitching foils in side-by-side configuration
  • The secondary instability in the oblique wake of a large-depth-ratio prism
  • The wake topology of a wall-mounted long cylinder at low Reynolds numbers.
  • The wake transitions to unsteadiness at moderate yaw angles for long-rectangular cylinders
  • Three-dimensional instability in the wake of oscillating foils with combined heaving and pitching.
  • Three-dimensional unsteady wake dynamics of hydrofoils with combined pitching and heaving motions
  • Transition in the wake symmetry of tandem side-by-side oscillating foils.
  • Unsteadiness in the wake of a long wall-mounted cylinder at high angles of incident
  • Wake structures and propulsive performance in heaving panels with a small aspect ratio
  • Wake symmetry and its effect on wake swimming synchronization
  • Why do anguilliform swimmers perform undulation with wavelengths shorter than their bodylengths?