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Forum: OpenFOAM Running, Solving & CFD

February 12, 2013, 08:08

Replies: 22

Boundary Conditions Problem

Views: 2,397

Posted By asoltoon

Hi, According to CFL condition, your dt...

Hi,

According to CFL condition, your dt should be less than 1.2e-14 sec, so you should make a coarser mesh. I am not an expert on openFoam but as much as I know if you don't overconstrain the B.Cs...

Forum: OpenFOAM Running, Solving & CFD

February 4, 2013, 07:11

Replies: 22

Boundary Conditions Problem

Views: 2,397

Posted By asoltoon

Hello again, you can reduce time-step, it...

Hello again,
you can reduce time-step, it doesn't affect the solution but will reduce the Co number and can help your solution to converge. you should determine your time-step such as your Co number...

Forum: OpenFOAM Running, Solving & CFD

February 4, 2013, 06:04

Replies: 22

Boundary Conditions Problem

Views: 2,397

Posted By asoltoon

Hi, As I see the problem settings is such...

Hi,

As I see the problem settings is such that the courant number becomes much larger than allowed value and so cause the solution to diverge. you must change your boundary as the courant number...

Forum: OpenFOAM Running, Solving & CFD

February 3, 2013, 01:39

Replies: 22

Boundary Conditions Problem

Views: 2,397

Posted By asoltoon

Hi, When the error occures? after a few...

Hi,

When the error occures? after a few timesteps going on or before the solution starts?
zeroGradient means that your variable has equal magnitude to the cell beside it. so if your B.C. is...

Forum: OpenFOAM Running, Solving & CFD

February 2, 2013, 07:54

Replies: 22

Boundary Conditions Problem

Views: 2,397

Posted By asoltoon

Hi himanshu28, I don't know what the error...

Hi himanshu28,

I don't know what the error means, but it seems that your pressure B.C. is OK. How about the velocity B.C.? Did you define it correctly? the inlet velocity B.C. should be...

Forum: OpenFOAM Running, Solving & CFD

January 30, 2013, 10:26

Replies: 22

Boundary Conditions Problem

Views: 2,397

Posted By asoltoon

Hi himanshu28, According to the problem...

Hi himanshu28,

According to the problem geometry that you have attached the velocity Inlet should be (0 -2 0), not (-2 0 0).

Regards,
Ali

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