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Am getting very strange pressure/velocity problems at the inlet after a while |
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July 25, 2019, 17:53 |
Am getting very strange pressure/velocity problems at the inlet after a while
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#1 |
New Member
Andrei Cojocea
Join Date: Jul 2019
Posts: 8
Rep Power: 7 |
Dear all,
I have been trying for a while now to simulate a 2D incompressible flow past a square cylinder using k-omega model and to obtain convergency. After creating the blockMesh and 0 files and system directories, I have managed to get the simulation started and it works fine for a while, but then it starts working wrong. |
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July 25, 2019, 17:55 |
part_2
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#2 |
New Member
Andrei Cojocea
Join Date: Jul 2019
Posts: 8
Rep Power: 7 |
Here are the rest of the files from OpenFoam.
Thank you very much. |
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July 25, 2019, 18:18 |
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#3 |
Senior Member
Join Date: Mar 2018
Posts: 115
Rep Power: 8 |
What is goining wrong?
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July 25, 2019, 19:00 |
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#4 |
New Member
Andrei Cojocea
Join Date: Jul 2019
Posts: 8
Rep Power: 7 |
First of all, thank you for your reply. I will upload some screenshots with the flow development for U,p and k in order to show you exactly what i get.
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July 25, 2019, 19:51 |
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#5 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,981
Blog Entries: 45
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Quick answers:
__________________
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July 25, 2019, 20:01 |
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#6 |
New Member
Andrei Cojocea
Join Date: Jul 2019
Posts: 8
Rep Power: 7 |
Ahhhh, i didn't think about total pressure. Thank you very much, I will start the simulation again, hopefully this time works.
In addition to my previous question, is it possible to define the inlet as a single patch? Instead of doing it block by block, just define the upper and lower edger for the whole inlet. |
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July 25, 2019, 20:45 |
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#7 | |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,981
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Quick answers:
Quote:
If you want to use only blockMesh... uh... Maybe use Blender with the SwiftBlock add-on? https://openfoamwiki.net/index.php/Contrib/SwiftBlock |
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July 26, 2019, 19:48 |
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#8 |
New Member
Andrei Cojocea
Join Date: Jul 2019
Posts: 8
Rep Power: 7 |
Thank you for your reply.
I have tried what you said about total pressure and the simulation is still not working. I get the same problem after a number of iterations. |
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July 27, 2019, 04:26 |
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#9 | |
Senior Member
Oskar
Join Date: Nov 2015
Location: Poland
Posts: 184
Rep Power: 11 |
Hello.
Why You are using those velocity and pressure inlets and outlets? I think Your simulation crashes when pressure wave reach inlet. Try to use different velocity and pressure inlet BC. https://www.openfoam.com/documentati...conditions.php Search for Inlet and Outlet BC. For example: Quote:
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July 27, 2019, 10:29 |
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#10 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,981
Blog Entries: 45
Rep Power: 128 |
Quick suggestion: This blog post has a ton of information on how to set-up these kinds of simulations: http://matveichev.blogspot.com/2014/...ex-street.html
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Tags |
blockmesh, k-omega simualtions, openfoam 1.6 |
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