Abstract
A direct numerical simulation (DNS) of a separated flat-plate turbulent boundary layer has been performed with a large spanwise domain. The inlet data are prescribed by a DNS of a zero-pressure gradient turbulent boundary layer with the rescaling-recycling method. The Reynolds number at the inlet is set to be Re 0=600 where Re 0 is the Reynolds number based on the free stream velocity and the momentum thickness. It is shown that in the simulation involving large turbulent separation, a spanwise domain, which is large enough to capture large-scale turbulence structures downstream from the reattached point, is required for obtaining proper turbulence statistics and structures. It is also shown that when there is a large separated region, positive and negative regions of the streamwise velocity fluctuation, which appear alternatively in the spanwise direction, exist in both detached and reattached regions where the spanwise spacing in the latter region is about twice as large as that in the former region.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
