Publication: A volume-based discrete test filter for conducting LES with application to physiological flow

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Title	A volume-based discrete test filter for conducting LES with application to physiological flow
Authors/Editors*	Bahramian, F, Straatman, AG
Where published*	. J. Numerical Methods in Fluids
How published*	Journal
Year*	2009
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Abstract	A discrete test filtering operation that takes advantage of a volume-averaging procedure, as opposed to the more popular line-interpolation technique, has been developed to enable mixed-scale and dynamic LES simulations on general unstructured grids. Simulations of fully-developed turbulent flow in a square duct show that the proposed test filter gives results of similar accuracy to the best modern filters developed for non-uniform orthogonal grids, but that a second-order correction is required to produce solutions of sufficient accuracy. The discrete filter technique is also used to simulate stationary and pulsatile turbulent flow in a 75% constricted tube, in which the flow undergoes transition to turbulence. Comparisons to previous published results confirm that results obtained using the proposed discrete test filter are in good agreement with existing experimental and numerical results.