Problem solving incomp. flow

A subforum specific to the development of the OpenFoam-based workbenches ( Cfd https://github.com/qingfengxia/Cfd and CfdOF https://github.com/jaheyns/CfdOF )

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Sidemountyucatan
Posts: 25
Joined: Wed Apr 17, 2019 2:08 pm

Problem solving incomp. flow

Postby Sidemountyucatan » Wed Jun 19, 2019 9:27 am

Dear all,

I tried to solve a problem but I got the following error message:

0.0: Checking dependencies...
0.0: OpenFOAM case writer is called
0.2: Write OpenFOAM case is completed
0.1: Starting solver command:
0.1: C:\BLUECF~1\OPENFO~1.X\..\msys64\usr\bin\bash --login -O expand_aliases -c cd "/c/users/t42/appdata/local/temp/case" && ./Allrun
0.1: Solver started
5.0: OpenFOAM fatal error: Cannot find file "points" in directory "polyMesh" in times 0 down to constant
5.0: Simulation exited with error

Due to the fact I am new on CFD and CFDOf especially could someone give me a hint whats gone wrong. I have attached the file.
Thanks a lot !!
Best Regards
Marcus
Attachments
Mischkammer_CFD.FCStd
(148.17 KiB) Downloaded 15 times
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oliveroxtoby
Posts: 336
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Location: South Africa

Re: Problem solving incomp. flow

Postby oliveroxtoby » Wed Jun 19, 2019 7:55 pm

Sidemountyucatan wrote:
Wed Jun 19, 2019 9:27 am
Dear all,

I tried to solve a problem but I got the following error message:

0.0: Checking dependencies...
0.0: OpenFOAM case writer is called
0.2: Write OpenFOAM case is completed
0.1: Starting solver command:
0.1: C:\BLUECF~1\OPENFO~1.X\..\msys64\usr\bin\bash --login -O expand_aliases -c cd "/c/users/t42/appdata/local/temp/case" && ./Allrun
0.1: Solver started
5.0: OpenFOAM fatal error: Cannot find file "points" in directory "polyMesh" in times 0 down to constant
5.0: Simulation exited with error

Due to the fact I am new on CFD and CFDOf especially could someone give me a hint whats gone wrong. I have attached the file.
Thanks a lot !!
Best Regards
Marcus
I don't get that error. Make sure that you generate the mesh before running the solver.

I get a different (floating point) exception when trying to run the case. I am fairly sure this is because the mesh is too coarse and no mesh faces on the second inlet. Some refinement should fix it.
Please provide all the information requested in this post before reporting problems with CfdOF.
Sidemountyucatan
Posts: 25
Joined: Wed Apr 17, 2019 2:08 pm

Re: Problem solving incomp. flow

Postby Sidemountyucatan » Thu Jun 20, 2019 11:25 am

Hi olivertoxoby,

I did another trial with a simpler problem just to investigate the "tricks" and challenges. It is simply a diffusor in between
2 pipes. (I did attach the file aswell). Interestingwise I got a error message too but I cannot evaluate why.
204.7: Simulation exited with error
I did mesh refinement. I used snappyhexmesh as net-tool.


Could you take a look to it and tell me why it wont work ? Would really give me help on my way to better understand the matter.


Thx a lot !
Attachments
Diffusor.FCStd
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Sidemountyucatan
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Re: Problem solving incomp. flow

Postby Sidemountyucatan » Thu Jun 20, 2019 11:50 am

… interestingwise I did make a transient run and than it worked ….. can you give me an indication why ? …….
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oliveroxtoby
Posts: 336
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Location: South Africa

Re: Problem solving incomp. flow

Postby oliveroxtoby » Fri Jun 21, 2019 5:45 am

Sidemountyucatan wrote:
Thu Jun 20, 2019 11:25 am
Hi olivertoxoby,

I did another trial with a simpler problem just to investigate the "tricks" and challenges. It is simply a diffusor in between
2 pipes. (I did attach the file aswell). Interestingwise I got a error message too but I cannot evaluate why.
204.7: Simulation exited with error
I did mesh refinement. I used snappyhexmesh as net-tool.


Could you take a look to it and tell me why it wont work ? Would really give me help on my way to better understand the matter.


Thx a lot !
This was an issue with the CfdOF - we were not writing pressure from the potential flow initialisation, resulting in a large imbalance with the 400 kPa boundary. Should be fixed now.
Please provide all the information requested in this post before reporting problems with CfdOF.