Cells And Points

gimli79 · May 4, 2010, 17:33

Hi everyone,
I have some questions to the polymesh in OpenFoam 1.6.
For my further computations I need the pressureloads on the several wall elements, without using a postprocessor.
So I tried to find the pressures in the P file. There, they are all listet, but I am not able to identify the correct cell id.
My problem here is that I dont know which cell id corresponds to which wall id. I tried to get these via the points and the cells file in the polymesh, but in version 1.6 no cell file is created.
So my questions are:

Where is the information to the relation between points and cells stored and how can I get access to it ?

Is it possible to say OpenFoam that a cell file should be created?

Is it possible to transform the pressure to nodalforces on the wallpoints and can this then be written out ?

Is it possible to define a kind of outputset, for which the pressures are written out?

I hope that somebody can help me with all these questions.

So,thanks a lot

Andy

AlanR · May 4, 2010, 20:33

Andy, I don't have access to Foam from here to check the details, but the boundary file in the polymesh directory should help you figure out what point/cell range applies to each of your patches. There is a post processing utility called sample that will help you access data. It has a dictionary file with a lot of settings - I haven't spent much time exploring it yet, but I was able to pull out a set of velocity points. You can search the forum on sample for more info. Good luck,

Alan

May 4, 2010, 17:33	Cells And Points	#1
gimli79 New Member Andreas Beck Join Date: Apr 2010 Posts: 5 Rep Power: 16	Hi everyone, I have some questions to the polymesh in OpenFoam 1.6. For my further computations I need the pressureloads on the several wall elements, without using a postprocessor. So I tried to find the pressures in the P file. There, they are all listet, but I am not able to identify the correct cell id. My problem here is that I dont know which cell id corresponds to which wall id. I tried to get these via the points and the cells file in the polymesh, but in version 1.6 no cell file is created. So my questions are: Where is the information to the relation between points and cells stored and how can I get access to it ? Is it possible to say OpenFoam that a cell file should be created? Is it possible to transform the pressure to nodalforces on the wallpoints and can this then be written out ? Is it possible to define a kind of outputset, for which the pressures are written out? I hope that somebody can help me with all these questions. So,thanks a lot Andy

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May 4, 2010, 20:33		#2
AlanR Member Alan Russell Join Date: Aug 2009 Location: Boise, Idaho USA Posts: 61 Rep Power: 17	Andy, I don't have access to Foam from here to check the details, but the boundary file in the polymesh directory should help you figure out what point/cell range applies to each of your patches. There is a post processing utility called sample that will help you access data. It has a dictionary file with a lot of settings - I haven't spent much time exploring it yet, but I was able to pull out a set of velocity points. You can search the forum on sample for more info. Good luck, Alan