How to find the number of points in a boundary?

Verse · July 19, 2016, 10:39

Hello, I was wondering if someone could help me with a simple problem - I'm looking to be able to obtain the total number of points in a certain boundary (say, "wall"). I know to obtain the total number of points one needs, say:

Code:

int nPoints = mesh.nPoints();

But how do I do this for just one specific boundary?

Jerryfan · July 20, 2016, 13:28

Hi Verse,

The following is my idea, I hope it can help you.

Quote:

//First of all, you need to get the patch you are interested in, for example, "movingwall"
const label patchI = mesh.findPatchID("movingwall");
const fvPatch& patch = mesh.boundary()[patchI];
//Then return the total points in the patch
const label ntPoints = patch.nPoints();

Verse · July 20, 2016, 14:45

Thanks Jerry! Works perfectly, really appreciate it.

July 19, 2016, 10:39	How to find the number of points in a boundary?	#1
Verse New Member Dominic Join Date: May 2016 Posts: 27 Rep Power: 10	Hello, I was wondering if someone could help me with a simple problem - I'm looking to be able to obtain the total number of points in a certain boundary (say, "wall"). I know to obtain the total number of points one needs, say: Code: int nPoints = mesh.nPoints(); But how do I do this for just one specific boundary? Last edited by Verse; August 18, 2016 at 09:59.

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July 20, 2016, 14:45		#3
Verse New Member Dominic Join Date: May 2016 Posts: 27 Rep Power: 10	Thanks Jerry! Works perfectly, really appreciate it.