Not the results i expected

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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Budahn
Posts: 12
Joined: Fri Jul 01, 2022 9:56 pm

Not the results i expected

Post by Budahn »

Thats it, i can run the simulation perfectly but when i see the results in Paraview it not goes the way i expected, i dont know if its a geometry problem, maybe the XOR or a boundary error that im having. Please if someone can help me ill be gratefull. Thanks!!!
Attachments
randomthing.FCStd
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Jee-Bee
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Posts: 2536
Joined: Tue Jun 16, 2015 10:32 am
Location: Netherlands

Re: Not the results i expected

Post by Jee-Bee »

If you don't post wat you expect and what you want to achieve... how should we know?
Syres
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Posts: 1718
Joined: Thu Aug 09, 2018 11:14 am

Re: Not the results i expected

Post by Syres »

Looking at the file I'm guessing you're not grasping that you should only mesh the base geometry of where your fluid (air in this case) is to flow. So I'm again guessing from your model that Tubo is the only geometry that should be meshed. If you need 'Problem' wall as part of the case then you will have to make Tubo up from two objects with the join being at the plane where Problem resides. The whole box and it's fixing holes are redundant IMHO.

Have you done any of the tutorials at http://www.opensim.co.za/training.html , the demo files are part of the workbench in your users/home....\Mod\CfdOF\Demos folder?

Code: Select all

OS: Windows 7 Version 6.1 (Build 7601: SP 1)
Word size of FreeCAD: 64-bit
Version: 0.20.1.29410 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: f5d13554ecc7a456fb6e970568ae5c74ba727563
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: English/United Kingdom (en_GB)
Installed mods: 
  * A2plus 0.4.56a
  * Assembly3 0.11.3
  * CfdOF 1.17.7
  * Curves 0.5.4
  * fasteners 0.3.51
  * fcgear 1.0.0
  * freecad.xray 2022.4.17
  * Manipulator 1.4.9
  * Plot 2022.4.17
  * sheetmetal 0.2.56
  * Silk 1.0.0
Budahn
Posts: 12
Joined: Fri Jul 01, 2022 9:56 pm

Re: Not the results i expected

Post by Budahn »

Jee-Bee wrote: Thu Aug 11, 2022 8:15 am If you don't post wat you expect and what you want to achieve... how should we know?
Im sorry if i wasnt clear, with that simulation im tryyng to fill the box with the air of the tube but the air suddenly stop at the wall of the box and i dont know how to make it through
Budahn
Posts: 12
Joined: Fri Jul 01, 2022 9:56 pm

Re: Not the results i expected

Post by Budahn »

Syres wrote: Thu Aug 11, 2022 10:00 am Looking at the file I'm guessing you're not grasping that you should only mesh the base geometry of where your fluid (air in this case) is to flow. So I'm again guessing from your model that Tubo is the only geometry that should be meshed. If you need 'Problem' wall as part of the case then you will have to make Tubo up from two objects with the join being at the plane where Problem resides. The whole box and it's fixing holes are redundant IMHO.

Have you done any of the tutorials at http://www.opensim.co.za/training.html , the demo files are part of the workbench in your users/home....\Mod\CfdOF\Demos folder?

Code: Select all

OS: Windows 7 Version 6.1 (Build 7601: SP 1)
Word size of FreeCAD: 64-bit
Version: 0.20.1.29410 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: f5d13554ecc7a456fb6e970568ae5c74ba727563
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: English/United Kingdom (en_GB)
Installed mods: 
  * A2plus 0.4.56a
  * Assembly3 0.11.3
  * CfdOF 1.17.7
  * Curves 0.5.4
  * fasteners 0.3.51
  * fcgear 1.0.0
  * freecad.xray 2022.4.17
  * Manipulator 1.4.9
  * Plot 2022.4.17
  * sheetmetal 0.2.56
  * Silk 1.0.0
thanks for the response!! i wanted to fill the box with the fluid from the tube, so ill try to delete the "problem" wall maybe that works.
Thanks for the tutorials im definitely gonna do them
Syres
Veteran
Posts: 1718
Joined: Thu Aug 09, 2018 11:14 am

Re: Not the results i expected

Post by Syres »

Budahn wrote: Thu Aug 11, 2022 5:34 pm i wanted to fill the box with the fluid from the tube
I thought the best next step was to give you a working example as near to what you're trying to achieve (thanks go to Thomas for this https://forum.freecadweb.org/viewtopic. ... 32#p412832) and brought it up-to-date so it wouldn't error using the latest CfdOF workbench version 1.17.7. I also removed some extra geometry that might have confused a new user. Notice there's no mixing of Part and Part Design, it's just simple cylinders and booleans operations to cut one 3D object from another. You'll see when you mesh it that the deflector plates are cut from the inner tank to leave the volume of the flow. It's a much larger tank than your box so the cfMesh element size of 50mm will be too big for you so scale it down accordingly, guesstimate of 2.5mm won't be too far wrong.
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separator_th_1_17_7.FCStd
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