Outflow Boundary Condition Issues in Direct Numerical Simulation of Three-Dimensional Plane Wake Flow

Dif!eTr;nt choices of ontflow bounda7 1j conditions an, discussed in this paper and a PTOJH;T choice is used in a hybrirl numerical simulation irluc]: produces data to inucsiiqaie the effect of ouijlou) !)(J 1Lndm y corulition. The connective outjlou. bonnrlar1j condition with the uiau« sprerl as predicted [rom lituxu: stabilit:11 theory is used. The non refll C fi/wli C88 of this type is uiuestiqated and the rcjleciion or the lac]: of rcjlection in a Ill/lF rirfieit plane wake jiou. stuiulat.un: is stiulied. Tlu: results of simulation reported in iliis JHlper itulicaie that the wave speed predicted from linear stability analySIS is appropriatc for the conncctiue velocity at the ouijiou. boundm y of the larq« dr/int plane wake flow. On tlu: lither hand the usc of the [rcestreartr vclocilq for the conoeciiuc speed at the outflow boundary of a larqe dcjicii plane INr/,:( flow also yenemlcs a serious [cedbacl: prohlcu).