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Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 23:22
Replies: 45
Views: 3,348
Posted By czhongrong
It seemed to be able to simulate past the error...

It seemed to be able to simulate past the error point. But its taking way too long~(about 6hours to reach 0.01) What are some ways where I can speed up the process without having it to diverge again?
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 07:08
Replies: 45
Views: 3,348
Posted By czhongrong
Yes, I'm running transient simulation. If I set...

Yes, I'm running transient simulation. If I set all the relaxationFactors to 1, do I still need to set the nOuterCorrectors to 20 as well?
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 05:01
Replies: 45
Views: 3,348
Posted By czhongrong
Alright, so I will set my deltaT as 0.25E-4,...

Alright, so I will set my deltaT as 0.25E-4, maxCo as 0.5 and make the changes in the PIMPLE block, and see how it goes.

Just wondering, would maxCo = 0.5 make my simulation to run for ages?...
Forum: OpenFOAM Running, Solving & CFD November 20, 2015, 04:32
Replies: 45
Views: 3,348
Posted By czhongrong
Yes, I'm using pimpleFoam. 1) I do not have...

Yes, I'm using pimpleFoam.

1) I do not have a "momentumPredictor" entry in fvSolution. Attached is my fvSolution file.

2) nCorrectors was initially 2.

3) Currently my deltaT is 1E-4 in...
Forum: OpenFOAM Running, Solving & CFD November 19, 2015, 23:37
Replies: 45
Views: 3,348
Posted By czhongrong
Hi mkraposhin, I've encountered some problem...

Hi mkraposhin,

I've encountered some problem with my simulation. It keeps getting this error. See attached for log(only an extract). It looks like it suddenly diverges. Is it a problem with my...
Forum: OpenFOAM Running, Solving & CFD November 13, 2015, 08:46
Replies: 45
Views: 3,348
Posted By czhongrong
UPDATE: The simulation seems to be running well!...

UPDATE: The simulation seems to be running well! Thanks a lot!
Forum: OpenFOAM Running, Solving & CFD November 13, 2015, 04:25
Replies: 45
Views: 3,348
Posted By czhongrong
The core processors are idling though, I will...

The core processors are idling though, I will update once I got it to run...
Forum: OpenFOAM Running, Solving & CFD November 11, 2015, 04:58
Replies: 45
Views: 3,348
Posted By czhongrong
Thanks!! I've managed to solve the undefined...

Thanks!! I've managed to solve the undefined patches! Now I'm trying to lower the max aspect ratio...

Thank you so much! It is of indeed great help for my project!
Forum: OpenFOAM Running, Solving & CFD November 11, 2015, 03:54
Replies: 45
Views: 3,348
Posted By czhongrong
How can I reduce the max aspect ratio? Would...

How can I reduce the max aspect ratio? Would simpleGrading help? Because now I'm just testing the mesh with simpleGrading (1 1 1), to see if it works...
Forum: OpenFOAM Running, Solving & CFD November 10, 2015, 06:52
Replies: 45
Views: 3,348
Posted By czhongrong
I've done according to what you've instructed,...

I've done according to what you've instructed, but now I encountered another error.:confused: Apparently, blockMesh said I have undefined faces, which I couldn't figure out as I have listed all the...
Forum: OpenFOAM Running, Solving & CFD November 7, 2015, 10:41
Replies: 45
Views: 3,348
Posted By czhongrong
blockMesh crashed while "creating topology...

blockMesh crashed while "creating topology patches" after I blocked out "boundary", and had the following error:
Forum: OpenFOAM Running, Solving & CFD November 7, 2015, 06:48
Replies: 45
Views: 3,348
Posted By czhongrong
Thanks a lot! I'll try it out soon...

Thanks a lot! I'll try it out soon...
Forum: OpenFOAM Running, Solving & CFD November 7, 2015, 06:16
Replies: 45
Views: 3,348
Posted By czhongrong
Erm, how can I disable patches?

Erm, how can I disable patches?
Forum: OpenFOAM Running, Solving & CFD November 3, 2015, 04:01
Replies: 45
Views: 3,348
Posted By czhongrong
Hi mkraposhin, HELP! I've created the mesh...

Hi mkraposhin,

HELP! I've created the mesh and encountered some error in blockMesh as follows. I'm not sure if my labelling sequence in hex blocks are correct. :confused: Attached is my schematic...
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 05:12
Replies: 45
Views: 3,348
Posted By czhongrong
Thanks so much! I will give it a try and update...

Thanks so much! I will give it a try and update again!
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 05:03
Replies: 45
Views: 3,348
Posted By czhongrong
Save blocks?

Save blocks?
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 04:51
Replies: 45
Views: 3,348
Posted By czhongrong
For the lower part of my geometry, can I just...

For the lower part of my geometry, can I just model it like how I used to, in my earlier posts? By the diagonals 0-12 and 13-1?
Forum: OpenFOAM Running, Solving & CFD November 2, 2015, 04:20
Replies: 45
Views: 3,348
Posted By czhongrong
Hi mkraposhin, Yes, indeed my discretisation...

Hi mkraposhin,

Yes, indeed my discretisation still yields 88 deg of non-orthogonality.

1) Are points 4, 6, 8, 9, 13, 14 all arbitrary points on the circle which I can choose on my own?

2) I...
Forum: OpenFOAM Running, Solving & CFD November 1, 2015, 10:49
Replies: 45
Views: 3,348
Posted By czhongrong
By the way, I've tried to mesh in a different...

By the way, I've tried to mesh in a different layout. See attached for layout. But I keep getting the following error from blockMesh - "face 3 in patch 2 does not have neighbour cell face: 4(3 4 7...
Forum: OpenFOAM Running, Solving & CFD October 31, 2015, 23:59
Replies: 45
Views: 3,348
Posted By czhongrong
Thanks for the layout, but just a few questions,...

Thanks for the layout, but just a few questions, I couldn't quite visualise properly:o:

1) I see 2 circles, do I have to model that outer circle? If yes, is the area in-between the 2 circles...
Forum: OpenFOAM Running, Solving & CFD October 30, 2015, 21:16
Replies: 45
Views: 3,348
Posted By czhongrong
Hi mkraposhin, Is there any rule of thumb or...

Hi mkraposhin,

Is there any rule of thumb or guideline that we can follow to avoid high non-orthogonality? As seen from my geometry in my previous reply #3, I find it difficult to change the...
Forum: OpenFOAM Running, Solving & CFD October 30, 2015, 04:37
Replies: 45
Views: 3,348
Posted By czhongrong
So I would need to reduce the "Mesh...

So I would need to reduce the "Mesh non-orthogonality Max" to be below 60-70? If so, how can I do that? Do I still need to care about the max skewness?
Forum: OpenFOAM Running, Solving & CFD October 30, 2015, 03:10
Replies: 45
Views: 3,348
Posted By czhongrong
Hi akidess, I can't get my STL to work,...

Hi akidess,

I can't get my STL to work, that's why I use blockMeshDict to mesh my geometry.
Forum: OpenFOAM Running, Solving & CFD October 30, 2015, 02:02
Replies: 45
Views: 3,348
Posted By czhongrong
Hi vishal3, My geometry is a cylinder with a...

Hi vishal3,

My geometry is a cylinder with a protruded top on its surface(see attached). I just can't seem to be able to decrease the max skewness. May I know what parameters I could try editing?...
Forum: OpenFOAM Running, Solving & CFD October 29, 2015, 20:20
Replies: 45
Views: 3,348
Posted By czhongrong
Diverging simulation

Hi, my simulation is diverging. I've tried increasing nNonOrthogonalCorrectors up to 10, and also introducing residualControl in fvSolution, but nothing helps. My checkMesh log is as follows.

The...
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