热流科学与工程亚步文源大堂E教育部重点实验室D.MM+IMI(2) The 1st derivatives at outlet =const.Wi,MVi,M1 - Vi,M2 = k = constAyVi,M1 = Vi,M2 + kAy = ViM2 +CC is determined according to total mass conservation.ZPi,m(v.M2 +C)Ax, = FLOWIN1=2FLOWIN-EPi.mi,M2Ax,C.Zpi,mAx,'.Mi = vi.M2 + C is taking as boundary condition for nextiteration.When flow is fully developed at outlet,: f=l,C-0;Otherwisethereissomedifferencesbetweenthetwotreatments, but such difference is not importantΦCFD-NHT-EHT11/34CENTER
11/34 (2) The 1st derivatives at outlet =const. i M i M , 1 , 2 v v k const y i M i M i M , 1 , 2 , 2 v v k y v C C is determined according to total mass conservation. 2 , 1 , 2 2 ( ) L i M i M i i v C x FLOWIN , 1 , 2 , 1 i M i M i i M i FLOWIN v x C x When flow is fully developed at outlet,：f =1,C=0； Otherwise there is some differences between the two treatments, but such difference is not important. * i M, 1 i M, 2 v v C is taking as boundary condition for next iteration
热流科学与工程西步文源大堂E教育部重点实验室2)Outletwithrecirculation8/+1Vi,Mi is the normal velocitydetermined by local massconservation, thenZpi.m(f .vi,Mi)Ax = FLOWINi=2L2f = FLOWIN(ZPi,MiVi,MAx,)i=2Vi,M = f Vi,M1 is taking as the boundary conditionfor next iteration2. ApplicationsLiPW,TaoWQ.Effects of outflow boundary condition on convective heat transferwith strong recirculationflow.Warme-Stoffubertrag,1994,29(8):463-470ΦCFD-NHT-EHT12/34CENTER
12/34 2) Outlet with recirculation is the normal velocity determined by local mass conservation，then vi M, 1 2 , 1 , 1 2 ( ) L i M i M i f v x FLOWIN 2 , 1 , 1 2 ( ) L i M i i M i f FLOWIN v x 1 , 1 , vi M f vi M is taking as the boundary condition for next iteration. 2. Applications Li PW, Tao WQ. Effects of outflow boundary condition on convective heat transfer with strong recirculation flow. Warme- Stoffubertrag,1994, 29 (8): 463-470