# 3d velocity profile

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 February 9, 2004, 13:32 3d velocity profile #1 zwdi Guest   Posts: n/a Hello Everyone, Did anybody know adding 3d UDF velocity profile of Ux= 0.06*pow(10*y,0.13), Uy=Uz=0 to Fluent6.1? It is the boundary layer profile (power law). For 2d I am OK. But for 3D, things seem very complicated for me. I could not figure it out. Could somebody help me out? Thanks in advanced. Zwdi

 February 10, 2004, 11:58 help on 3d velocity profile #2 zwdi Guest   Posts: n/a Could anybody help me on this topic? Thanks a lot Zwdi

 February 10, 2004, 15:26 Re: 3d velocity profile #3 ap Guest   Posts: n/a It's just the same as in 2D. You just need to know that in the cell centroid vector, x is in position 0, y is in position 1 and z is in position 2. The function should be the following. Hook it in FLUENT BC panel to your inlet, in the x-velocity box. DEFINE_PROFILE(my_Ux, t, i) { cell_t c; real x[ND_ND]; real y; begin_c_loop (c,t) { C_CENTROID(x,c,t); y =x[1]; F_PROFILE(c,t,i) = 0.06*pow(10*y,0.13); } end_c_loop (c,t) } Hi ap

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