[Other] Openfoam output-format for calculix (FEM) - create the "cells" file in OpenFoam

gillers18 · February 17, 2015, 08:11

Greetings All ,

I m working with another Colleage on a problem dealing with Fluid Sturcture Interaction. He is responsible for the fluid simulation in Openfoam and I will continue with the FEM-Simualtion in Calculix. As for Calculix, 3 files are necessary in order to import Openfoam results and they are:

points

faces

cells

According to my colleague, the file "cells" doesn´t exist in the new OpenFoam Versions anymore and have benn replaced by 2 files named "neighbour" and "owner".

It is possible in OpenFoam to generate the file "cells" again?

I found a link to a code for that on the internet which was unfornetaly not applicable anymore.

Help!

Best regards

Thierry

elvis · February 18, 2015, 07:04

Hello Thierry,

may I ask you one Question. Which OpenFOAM Version are you using?
That from the Extend-Communty http://sourceforge.net/projects/openfoam-extend/files/ or OpenFOAM Foundation

If you use the Extend-Version you might benefit from using GGI-Interface that helps you when the nodes on the FEM and CFD are not conforming

gillers18 · February 19, 2015, 09:56

Hello Elvis,

Thx for your answer. I am using none of the both versions. Indeed, I have a windows-version installed on my PC and have started it once or twice. Actually my Issue is to tell
my colleague in which Format he has to export the results of his OpenFoam Simulation so that I can continue with the FEM-Simulation with the so called Open Source Calculix. I tried to convert the result in a foam-format but calculix can´t read it.
While browsing the Internet I came across the above-mentioned method and that is:

"Extract the data from the files: Points, Faces, and Cells" from OpenFoam

somehow the File Cells doesn´t exist in the newest versions of Openfoam anymore and has been replaced by the Files Neighbour and Owner. Is there a way to create that file Cells again?

Thx

roma-aeterna · April 27, 2015, 04:59

@gillers18: I'm working on a quite similar problem, so I was wondering if you have got a solution for that problem?

What I want to do is to calculate the pressure distribution of a panel, then map this solution on a panel in Calculix and calculate the displacements. According to these displacements I want to create a new mesh in OpenFoam and recalculate the pressure distribution, map it to the panel in Calculix, and so on. So that is kind of a Fluid-Structure Interaction. I am working with the OpenFoam Version 2.3.1.
Thanks for all ideas,
roma-aeterna

gillers18 · April 28, 2015, 04:24

Hey roma-aeterna,

I have not found a solution to the problem but I made another Thread on this site and I looking forward for some Help. I think from that thread you can see how far I have come and which problem I currently have. See the following Link.

http://www.cfd-online.com/Forums/ope...tml#post543517

Please Let me know If u find smth.

Best Regards

Thierry

February 17, 2015, 08:11	Openfoam output-format for calculix (FEM) - create the "cells" file in OpenFoam	#1
gillers18 New Member Join Date: Feb 2015 Location: Stuttgart Posts: 7 Rep Power: 11	Greetings All , I m working with another Colleage on a problem dealing with Fluid Sturcture Interaction. He is responsible for the fluid simulation in Openfoam and I will continue with the FEM-Simualtion in Calculix. As for Calculix, 3 files are necessary in order to import Openfoam results and they are: points faces cells According to my colleague, the file "cells" doesn´t exist in the new OpenFoam Versions anymore and have benn replaced by 2 files named "neighbour" and "owner". It is possible in OpenFoam to generate the file "cells" again? I found a link to a code for that on the internet which was unfornetaly not applicable anymore. Help! Best regards Thierry

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February 18, 2015, 07:04		#2
elvis Senior Member Elvis Join Date: Mar 2009 Location: Sindelfingen, Germany Posts: 620 Blog Entries: 6 Rep Power: 24	Hello Thierry, may I ask you one Question. Which OpenFOAM Version are you using? That from the Extend-Communty http://sourceforge.net/projects/openfoam-extend/files/ or OpenFOAM Foundation If you use the Extend-Version you might benefit from using GGI-Interface that helps you when the nodes on the FEM and CFD are not conforming

February 19, 2015, 09:56		#3
gillers18 New Member Join Date: Feb 2015 Location: Stuttgart Posts: 7 Rep Power: 11	Hello Elvis, Thx for your answer. I am using none of the both versions. Indeed, I have a windows-version installed on my PC and have started it once or twice. Actually my Issue is to tell my colleague in which Format he has to export the results of his OpenFoam Simulation so that I can continue with the FEM-Simulation with the so called Open Source Calculix. I tried to convert the result in a foam-format but calculix can´t read it. While browsing the Internet I came across the above-mentioned method and that is: "Extract the data from the files: Points, Faces, and Cells" from OpenFoam somehow the File Cells doesn´t exist in the newest versions of Openfoam anymore and has been replaced by the Files Neighbour and Owner. Is there a way to create that file Cells again? Thx

April 27, 2015, 04:59		#4
roma-aeterna New Member Anna Join Date: Apr 2015 Location: Stuttgart, Germany Posts: 3 Rep Power: 11	@gillers18: I'm working on a quite similar problem, so I was wondering if you have got a solution for that problem? What I want to do is to calculate the pressure distribution of a panel, then map this solution on a panel in Calculix and calculate the displacements. According to these displacements I want to create a new mesh in OpenFoam and recalculate the pressure distribution, map it to the panel in Calculix, and so on. So that is kind of a Fluid-Structure Interaction. I am working with the OpenFoam Version 2.3.1. Thanks for all ideas, roma-aeterna

April 28, 2015, 04:24		#5
gillers18 New Member Join Date: Feb 2015 Location: Stuttgart Posts: 7 Rep Power: 11	Hey roma-aeterna, I have not found a solution to the problem but I made another Thread on this site and I looking forward for some Help. I think from that thread you can see how far I have come and which problem I currently have. See the following Link. http://www.cfd-online.com/Forums/ope...tml#post543517 Please Let me know If u find smth. Best Regards Thierry