How to Determine Patch Size

mgdenno · July 28, 2011, 14:20

Does anyone know how to determine the size of a patch (in say square meters)? I used snappyHexMesh to generate a mesh that conforms to an irregular surface and now I am trying to determine the inlet boundary patch size.

Thanks,

MD

bigphil · July 28, 2011, 14:57

Hi,

If you use the "patchIntegrate" utility, it will tell you the area of a patch.

patchIntegrate takes two arguments, the first is the volScalarField you wish to integrate, and the second is the patch you want to integrate over. In your case just specify any volScalarField you have. It will print out the patch area as well as the integrated value.

Hope it helps,
Philip

mgdenno · July 28, 2011, 17:06

Phil,

Thanks for your help. I don't have my boundaries set up yet for this project so I don't have any scaler fields yet either...I will do as you suggested as soon as I get to that point.

Thanks again,

MD

doubtsincfd · July 28, 2011, 17:14

http://www.cfd-online.com/Forums/ope...ces-patch.html

mgdenno · July 30, 2011, 13:52

Phil and doubtsincfd thank you for your suggestions.

Phil I did as you suggested and it worked - thanks.

doubtsincfd I took a look at the link you suggested. It looked like a good solution, but maybe a little above my ability in OF at the moment as I haven't tried to do any coding with OF yet. Planning to try soon.

July 28, 2011, 14:20	How to Determine Patch Size	#1
mgdenno Senior Member Matthew Denno Join Date: Feb 2010 Posts: 138 Rep Power: 16	Does anyone know how to determine the size of a patch (in say square meters)? I used snappyHexMesh to generate a mesh that conforms to an irregular surface and now I am trying to determine the inlet boundary patch size. Thanks, MD

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July 28, 2011, 14:57		#2
bigphil Super Moderator Philip Cardiff Join Date: Mar 2009 Location: Dublin, Ireland Posts: 1,097 Rep Power: 34	Hi, If you use the "patchIntegrate" utility, it will tell you the area of a patch. patchIntegrate takes two arguments, the first is the volScalarField you wish to integrate, and the second is the patch you want to integrate over. In your case just specify any volScalarField you have. It will print out the patch area as well as the integrated value. Hope it helps, Philip

July 28, 2011, 17:06		#3
mgdenno Senior Member Matthew Denno Join Date: Feb 2010 Posts: 138 Rep Power: 16	Phil, Thanks for your help. I don't have my boundaries set up yet for this project so I don't have any scaler fields yet either...I will do as you suggested as soon as I get to that point. Thanks again, MD

July 28, 2011, 17:14		#4
doubtsincfd Senior Member Join Date: Nov 2009 Location: Michigan Posts: 135 Rep Power: 17	http://www.cfd-online.com/Forums/ope...ces-patch.html

July 30, 2011, 13:52		#5
mgdenno Senior Member Matthew Denno Join Date: Feb 2010 Posts: 138 Rep Power: 16	Phil and doubtsincfd thank you for your suggestions. Phil I did as you suggested and it worked - thanks. doubtsincfd I took a look at the link you suggested. It looked like a good solution, but maybe a little above my ability in OF at the moment as I haven't tried to do any coding with OF yet. Planning to try soon.