The feasibility of using a commercial CFD code for large eddy simulation (LES) is investigated. A first test on homogeneous turbulence decay allows a fine-tuning of the eddy viscosity with respect to the numerical features of the code. Then, a flow over forward–backward facing step at Reynolds number Reh 1⁄4 1:7 10 is computed. The results found show good agreement with the new LDA data of Lecl...

in this research, the coupling between non-gray radiation and separation convection flow in a duct is investigated numerically. distributions of absorption coefficients across the spectrum  are obtained from the hitran2008 database. the full-spectrum k-distribution method is used to deal with the non-gray part of the problem, while the gray radiation calculations are performed using the planck ...

This paper demonstrates experimentally that imposed periodic forcing can significantly alter the global flow characteristics of over a double backward-facing step. The geometry consists two equal height steps spaced up to eight step heights apart. A zero-mass flux jet located at first step's top corner was issued frequencies ranging from below step-mode instability frequency approximately five ...

Abstract

We consider a smooth, spanwise-uniform forward-facing step defined by a Gauss error function of height 4 %–30 % and four times the width of the local boundary layer thickness δ99. The boundary layer flow over a smooth forward-facing stepped plate is studied with particular emphasis on stabilisation and destabilisation of the twodimensional Tollmien–Schlichting (TS) waves and subsequently on thr...

Flow topology and unsteady cavitation dynamics in the wake of a backward facing step was investigated using high speed videography time-resolved X-ray densitometry, along with static dynamic pressure measurements. The measurements are used to inform understanding underlying mechanisms observed flow as they related shock wave induced instabilities. differences cavity behavior at different number...