Browsing Mechanical and Materials Engineering, Department of by Author "Piomelli, Ugo"
Now showing items 1-10 of 10
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The Effect of Waveform Shape on Dynamics and Kinematics of the Flow in Endovascular Stents
Rouhi, Amirreza (2012-06-11)The effect of waveform shape and extension of negative flowrate are studied at two Reynolds numbers (Re = 80, Re = 200) on stented channels by looking at the kinematics and dynamics of the flow. The waveforms are reconstructed ... -
Effects of Wall Roughness on Adverse Pressure Gradient Boundary Layers
Mottaghian, Pouya (2015-12-24)Large-eddy Simulations were carried out on a flat-plate boundary layer over smooth and rough surfaces in the presence of an adverse pressure gradient, strong enough to induce separation. The inlet Reynolds number (based ... -
Large-Eddy and Wall-Modeled Simulations of Turbulent Flow Over Two-dimensional River Dunes
Mellati Nokhandan, MojtabaThe Large-Eddy Simulation (LES) technique is only applicable to wall-bounded flows at moderate Reynolds numbers due to its computational cost. Wall-layer models are designed to extend the LES concept to engineering flows ... -
Large-eddy simulation and modelling of dissolved oxygen transport and depletion in water bodies
Scalo, Carlo (2012-07-04)In the present doctoral work we have developed and tested a model for dissolved oxygen (DO) transfer from water to underlying flat and cohesive sediment beds populated with DO-absorbing bacteria. The model couples Large-Eddy ... -
Large-eddy simulation of unidirectional turbulent flow over dunes
Omidyeganeh, Mohammad (2013-05-28)We performed large eddy simulation of the flow over a series of two- and three-dimensional dune geometries at laboratory scale using the Lagrangian dynamic eddy-viscosity subgrid-scale model. First, we studied the flow ... -
Large-Eddy Simulations of Accelerating Boundary Layer Flows Over Rough Surfaces
Yuan, Junlin (2011-10-17)Large-eddy simulations are carried out to study the combined effects of roughness and favourable pressure gradient in boundary layer flows, where the high acceleration (on smooth walls) may cause flow reversion to ... -
Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces
Banyassady, Rayhaneh (2015-05-13)Large-eddy simulations were carried out to investigate the flow dynamics of wall jets over smooth and rough surfaces. Results were validated against data in the literature. A sand-grain roughness model is used, based on ... -
Numerical simulations of rough-wall turbulent boundary layers
Yuan, Junlin (2015-07-14)At sufficiently high Reynolds number, all surfaces are rough, and roughness affects most flows in engineering and the natural sciences. Examples range from atmospheric boundary layers over buildings and canopies, to ... -
Numerical study of an impinging jet with embedded vortices
Wu, Wen (2016-02-22)Large-eddy simulations of round forced impinging jets at laboratory scale are performed, as a simplified model of the helicopter rotor wake; the goals were to understand the dynamics of the vortices, and to help develop ... -
Subfilter-scale Stress Modelling for Large Eddy Simulations
Rouhi, AmirrezaA subfilter-scale (SFS) stress model is developed for large-eddy simulations (LES) and is tested on various benchmark problems in both wall-resolved and wall-modelled LES. The basic ingredients of the proposed model are ...