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Search took 0.00 seconds. Search: Posts Made By: mkraposhin
Forum: OpenFOAM Running, Solving & CFD November 21, 2015, 07:17
Replies: 45
Views: 3,348
Posted By mkraposhin
1) Increase maxCo to 0.8-0.9, but at the cost of...

1) Increase maxCo to 0.8-0.9, but at the cost of chance of divergence
2) Use more CPU
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 07:15
Replies: 45
Views: 3,348
Posted By mkraposhin
No, if you are running transient simulation, you...

No, if you are running transient simulation, you don't need to use outer corrections, so you msut set nOuterCorrectors to 1. And all relaxation factors must be set to 1.
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 05:57
Replies: 45
Views: 3,348
Posted By mkraposhin
I saw this strange place in your fvSolution just...

I saw this strange place in your fvSolution just now:


relaxationFactors
{
U 0.1;
nuTilda 0.1;
p 0.1;
k 0.1;
omega...
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 04:58
Replies: 45
Views: 3,348
Posted By mkraposhin
PIMPLE { momentumPredictor false; //this...

PIMPLE
{
momentumPredictor false; //this disables prediction of velocity using pressures from old time step
nOuterCorrectors 1;
nCorrectors 2;
nNonOrthogonalCorrectors...
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 04:05
Replies: 45
Views: 3,348
Posted By mkraposhin
Hi, i think that your mesh is good. As i...

Hi, i think that your mesh is good.

As i undestrand, you are using transient solver (pimpleFoam?)

Try next:

1) Set momentumPredictor in fvSolution->PIMPLE to false
2) Set nCorrectors to 2...
Forum: OpenFOAM Running, Solving & CFD November 13, 2015, 04:20
Replies: 45
Views: 3,348
Posted By mkraposhin
Hi, did your simulation converged with the new...

Hi,
did your simulation converged with the new mesh?
Forum: OpenFOAM Running, Solving & CFD November 11, 2015, 04:17
Replies: 45
Views: 3,348
Posted By mkraposhin
You must inrease number of discretization points...

You must inrease number of discretization points in z direction for all blocks and number of discretization points for large blocks in x and y directions - blocks like 38-59-4-58.

Or, you can...
Forum: OpenFOAM Running, Solving & CFD November 11, 2015, 03:49
Replies: 45
Views: 3,348
Posted By mkraposhin
Because you introduced new block, that is not...

Because you introduced new block, that is not connected to others. You must split this block to connect to point 4, 59, 60, 61, 62, 1. See attached jpg for example, new points are marked with red...
Forum: OpenFOAM Running, Solving & CFD November 9, 2015, 09:46
Replies: 45
Views: 3,348
Posted By mkraposhin
Hi, i checked your blockMeshDict and i can...

Hi, i checked your blockMeshDict and i can propose next changes

1) If you want to comment something between '(' and ')' brackets, use two slashes, for example:

// inlet
// {
// ...
Forum: OpenFOAM Running, Solving & CFD November 7, 2015, 06:40
Replies: 45
Views: 3,348
Posted By mkraposhin
Just comment everything in boundaries section ...

Just comment everything in boundaries section

I mean here:

boundary
(
//
//
);
Forum: OpenFOAM Running, Solving & CFD November 7, 2015, 06:03
Replies: 45
Views: 3,348
Posted By mkraposhin
Hi, i think, you must start by adding...

Hi,

i think, you must start by adding blocks one by one to find which block causes error. Also, you must disable all patches at this step
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 05:05
Replies: 45
Views: 3,348
Posted By mkraposhin
I attached file with lower part of mesh

I attached file with lower part of mesh
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 04:59
Replies: 45
Views: 3,348
Posted By mkraposhin
Yes, you can, but if you will do lower part of...

Yes, you can, but if you will do lower part of mesh like in example tutorials/stressAnalysis/solidDisplacementFoam/plateHole
or like the top part, you will get better mesh quality, i think.

Also,...
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 04:37
Replies: 45
Views: 3,348
Posted By mkraposhin
Yes, this was expected result, because you must...

Yes, this was expected result, because you must take care of planar angles between edges in each block - they all should be near 90 degrees



Yes, they are arbitrary, and with their position you...
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 03:59
Replies: 45
Views: 3,348
Posted By mkraposhin
Hi, I think that with the descretization shown...

Hi,
I think that with the descretization shown above, you will also get mesh with high non-orthogonality. I made another version of block geometry (see attachment).

Grey regions are blocks

In...
Forum: OpenFOAM Running, Solving & CFD October 31, 2015, 05:52
Replies: 45
Views: 3,348
Posted By mkraposhin
I would propose another a bit more complex...

I would propose another a bit more complex configuration of blocks - see attachment
Forum: OpenFOAM Running, Solving & CFD October 30, 2015, 08:58
Replies: 45
Views: 3,348
Posted By mkraposhin
Yes You must locate cells where...

Yes


You must locate cells where non-orthogonality is high and change geometry of corresponding blocks in blockMeshDict. To locate this cells, run:

checkMest


then
Forum: OpenFOAM Running, Solving & CFD October 30, 2015, 04:31
Replies: 45
Views: 3,348
Posted By mkraposhin
The problem is in non-orthogonality, in fact...

The problem is in non-orthogonality, in fact OpenFOAM's implementation of FVM will not work with non-orthogonality larger then 60-70 degrees
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