groovyBC for gradual inlet velocity
 

Hi everyone,

I'm doing a 2D forced convection case with chtMultiRegionSimpleFoam (steady case). I had no problem with relatively slow inlet velocity, but for higher one (100m/s), it diverged at some time!!!

I have tried all I could find in the forum to solve this problem: modified relaxation factors, tolerances, MaxCo number, timesteps, etc... but none was effective (it only delayed the crash).

I bet I can do several cases with gradually higher velocities each (mapping the results of previous case into the next one, and so on). That would be time consuming (not a problem for a 2D case, indeed,but for further studies in 3D...), therefore, I'd like to know:

With this great tool (groovyBC), how would you define the inlet velocity such as varying from 0 m/s to 100 m/s? with a kind of "log"like shape?
My knowledges in this matter are really weak :o

If this subject has already been discuss in another thread, please, be kind to redirect me to it :)

Best regards

My bad guys,

I discovered timeVaryingUniformFixedValue and it seems to be perfect :D

How do you implement it? I'm very interested in this It does not render your model to blow up?:confused:

Hi Charlie,

Yes it does... I'm still working on it to solve the matter