check of boundary conditions
 

Hy, how can I check my boundary-conditions exact ? If I give to a velocity-inlet for example 5 m/s I don't find them exact at postprocessing, only about 4.5 m/s up to 5.5m/s. Does fluent relax boundary-conditions ? or is the postprocessing not exact ? Jurek

Re: check of boundary conditions
 

Hi Jurek,

did you plot cell centers or cell vertexes values?

I think the right values should be on the cell vertexes.

Ciao

Maurizio

Re: check of boundary conditions
 

FLUENT post-processes and shows boundary values, such as at walls, by interpolation/extrapolation from the cell centered interior solution. Thus, stationary walls, for instance, may show finite velocities.

I recently spoke to Amish Thaker, FLUENT Technical Support, about this and my desire to "verify" that the boundary condition I specified actually was interpereted correctly and used by FLUENT's solver. He provided me with a user defined function (UDF) for this purpose. Although I don't want to unleash a mass amount of telephone calls to Amish, he can be reached at 1-800-445-4454 (x640).

Re: check of boundary conditions
 

Isn't the UDF somewhere on a www-server ? If all fluent users call Amish Thaker he will do nothing but mailing the next days..