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Forum: Main CFD Forum

January 1, 2010, 18:08

Replies: 10

first order converged--second order diverged

Views: 7,069

Posted By gmwsy

Dear Kingjewel1: Thanks for reply. I know...

Dear Kingjewel1:

Thanks for reply. I know about the adaption function in Fluent, but it might not help a lot. I recently found a potential solution for this problem: using a k-e model to get a...

Forum: Main CFD Forum

December 30, 2009, 04:37

Replies: 10

first order converged--second order diverged

Views: 7,069

Posted By gmwsy

Dear Koo, Thank you for your reply. I have...

Dear Koo,

Thank you for your reply. I have checked the mesh and obviously the problem occurs at the boundary layer. :mad:Because I am not using the wall function and thus y+ is around 1, so the...

Forum: Main CFD Forum

December 25, 2009, 08:39

Replies: 10

first order converged--second order diverged

Views: 7,069

Posted By gmwsy

Thank you! But this is just what I have done. The...

Thank you! But this is just what I have done. The iteration diverged when switched to 2nd order from a converged solution using 1st order...:mad:

Forum: Main CFD Forum

December 23, 2009, 12:45

Replies: 10

first order converged--second order diverged

Views: 7,069

Posted By gmwsy

Dear Tele, Thank you for your reply. But...

Dear Tele,

Thank you for your reply. But what i am doing is actually a steady case:D...so there does not exist time steps or initial solution.:(

Forum: Main CFD Forum

November 27, 2009, 09:48

Replies: 10

first order converged--second order diverged

Views: 7,069

Posted By gmwsy

Hi Ztdep, I am sorry I do not quite...

Hi Ztdep,

I am sorry I do not quite understand what you mean by the implementation. Could you please give a more detailed explanation?

Underralaxation factor has been tuned down, but it...

Forum: Main CFD Forum

November 26, 2009, 12:44

Replies: 10

first order converged--second order diverged

Views: 7,069

Posted By gmwsy

first order converged--second order diverged

Dear all,

In my case, I use first order upwind scheme and get a very well converged solution:D; however, when I switch to second order upwind scheme, totally diverge!!!:mad:

Any one has some...

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