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Active Member
0785725
Posts: 9
Registered: ‎01-18-2013
Accepted Solution

Convergence problem

183 Views, 2 Replies
04-23-2013 02:28 PM

I have this 2D CFD simulation which I can  get in no way to converge. I have tried almoost anything, but no luck came to me. I would be very obliged if someone could take a peek and possiblly give me a clue to what I am doing wrong.

 

Thanks in advance.

With regards, Floris

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Valued Mentor
AstroJohnPE
Posts: 498
Registered: ‎08-30-2012

Re: Convergence problem

05-01-2013 09:22 AM in reply to: 0785725

Hi Floris,

 

I am not clear whether your model did not converge on any time steps, or converged until step X, or "converged" but with stagnation.

 

I made one simple change to your model (see attached), and it ran to completion. (The change was removing the prescribed velocity at the corners of the inlet and the wall.) There was a warning on each time step about stagnation, but I did not investigate the issue any further.

 

When I opened the model, it asked me if I wanted to update it to the current version. So either my newer version (2013 SP2) or the change I mentioned helped.

John Holtz, PE
Mechanical Engineer
Pittsburgh, PA

16 years experience with Simulation Mechanical
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Active Member
0785725
Posts: 9
Registered: ‎01-18-2013

Re: Convergence problem

05-03-2013 01:32 PM in reply to: AstroJohnPE

Hi AstroJohnPE,

 

It didn't converge after time step 2. It just stopped with a message.

 

But your litle trick worked out realy well  :smileyhappy:, it ran smoothly to the end.

So, thank you so much.

 

Best wishes, Floris

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