Mapping fields between different programs

batta31 · February 25, 2013, 04:04

Hi guys, I have this question:
I have to import the velocity and pressure field from another program (STAR CCM+), and I need to use these fields as inlet condition on my case, which has the same geometry (in terms of body and patches) of the case run in STAR, but a different volume mesh (which is made with ANSA). Is there a way to interpolate those fields in order to use them with OpenFOAM?

I heard about the utility mapFields, to be used with different solvers inside OF, but I don't know if it can be used also between different programs.

Thank you for your replies!
Simone

deepsterblue · February 25, 2013, 08:52

You may want to take a look at MPCCI - not sure how relevant it is, though

wyldckat · February 25, 2013, 17:56

Greetings to all!

I'll quote myself from the other day, because it seems to fit quite nicely:

Quote:

Originally Posted by wyldckat

I believe what you're looking for is exemplified in the tutorial "incompressible/simpleFoam/pitzDailyExptInlet", in particular inside the folder "constant/boundaryData/inlet/".
There isn't much more I know of this tutorial, so I can only suggest you study it and do tell us if you have problems with it!

In essence: you need to export the inlet data you want to use, to CSV or something else, on Star-CCM+. Then refurbish the CSV data to the format in the example I quoted and there you have it!

Best regards,
Bruno

batta31 · February 26, 2013, 02:41

Thanks for your answer Bruno, it's a starting point for sure. But I have (maybe) a little problem, which is linked to the fact that also the inlet patch from which I extract the data in STAR has a different grid (and so different nodes) with respect to the one that will be used in ANSA. The file "points" in your example has generic coordinates or maybe those points are exactly the nodes of the inlet? This could be the answer..

wyldckat · February 26, 2013, 04:16

You could probe/sample/interpolate the points on the original mesh...

February 25, 2013, 04:04	Mapping fields between different programs	#1
batta31 Member Simone Join Date: Sep 2012 Posts: 95 Rep Power: 13	Hi guys, I have this question: I have to import the velocity and pressure field from another program (STAR CCM+), and I need to use these fields as inlet condition on my case, which has the same geometry (in terms of body and patches) of the case run in STAR, but a different volume mesh (which is made with ANSA). Is there a way to interpolate those fields in order to use them with OpenFOAM? I heard about the utility mapFields, to be used with different solvers inside OF, but I don't know if it can be used also between different programs. Thank you for your replies! Simone

February 25, 2013, 08:52		#2
deepsterblue Senior Member Sandeep Menon Join Date: Mar 2009 Location: Amherst, MA Posts: 403 Rep Power: 25	You may want to take a look at MPCCI - not sure how relevant it is, though __________________ Sandeep Menon University of Massachusetts Amherst https://github.com/smenon

February 26, 2013, 04:16		#5
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	You could probe/sample/interpolate the points on the original mesh... __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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February 26, 2013, 02:41		#4
batta31 Member Simone Join Date: Sep 2012 Posts: 95 Rep Power: 13	Thanks for your answer Bruno, it's a starting point for sure. But I have (maybe) a little problem, which is linked to the fact that also the inlet patch from which I extract the data in STAR has a different grid (and so different nodes) with respect to the one that will be used in ANSA. The file "points" in your example has generic coordinates or maybe those points are exactly the nodes of the inlet? This could be the answer..