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Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 10:42

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

Using single region mesh and topoSet utility can...

Using single region mesh and topoSet utility can help locate a problem. Why can't you use topoSet?

Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 10:29

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

Well, there could be a problem with connection...

Well, there could be a problem with connection between two regions. I still can't get why do you need mesh with two regions. You can create single region mesh (if it's just a cylinder, you can even...

Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 10:16

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

ICs and BCs seem to be reasonable. I lost one...

ICs and BCs seem to be reasonable. I lost one bracket it my previous post, so the correct PIMPLE dictionary (which is in fvSolution file) is

PIMPLE
{
nOuterCorrectors 250;
...

Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 10:01

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

Well, Correction no. 1 is just a switch to a...

Well,

Correction no. 1 is just a switch to a lower order discretisation scheme.

To be sure about results you have to use residualControl to check convergence.

Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 09:58

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

Well, something greater than 1 ;) Start with 5....

Well, something greater than 1 ;) Start with 5. Or just switch to residualControl, i.e. you change PIMPLE dictionary to something like:

PIMPLE
{
nOuterCorrectors 250;
nCorrectors ...

Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 09:39

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

Try changing: 1. div(phi,U) Gauss...

Try changing:

1.

div(phi,U) Gauss linear;

to

Forum: OpenFOAM Running, Solving & CFD

June 20, 2014, 09:14

Replies: 15

PimpleFoam: High Courant and Instability Problem

Views: 2,686

Posted By alexeym

Hi, Can you post your... 1. checkMesh...

Hi,

Can you post your...

1. checkMesh output
2. fvSchemes
3. fvSolution

(surely it'll be easier if you just post case files)

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