A volume-based discrete test filter for conducting large eddy simulations with application to physiological flow in a constricted tube
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 the results of similar accuracy to the best modern filters developed for non-uniform orthogonal grids, but 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 the results obtained using the proposed discrete test filter are in a good agreement with the existing experimental and numerical results. Copyright (C) 2009 John Wiley & Sons, Ltd.
test filter large eddy simulation volume-average