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justin April 6, 2006 18:28

grid adaption problem
Now I am studying wind environemnt around buildings. The used turbulence model and wall function are rng k-eps and standard function. the domain and model are boxes. The separation really occured, but the velocity of some points on windward is larger than that at inlet boundary.

The problem is that if I set the lower y+ max allowed, the size of cas and dat files will increase from 150Mb to 800Mb and it seriously affect the speed of calculation. also the increased cells mainly are near windward face.

What is the problem? Can I just make the y+ of near the model wall lower than 150 and keep the other wall about 400?


justindhy April 7, 2006 12:04

Re: grid adaption problem
please help!

Ravi April 8, 2006 01:36

Re: grid adaption problem
Hi justin

Before going for mesh adaptation itself

u shoud refine the mesh near the building and walls in the pre porcessing itself

grid refinement during meshing itself

and later in the solver u can go for adaptaton if needed

try this if possible

all the best bye Ravi Kiran

justin April 8, 2006 10:45

Re: grid adaption problem
Thanks, Ravi. I refines the mesh by gambit firstly. and after convergence, the y+ is too large. then I used the adapation. Is it right?

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