splitting boundary patch into several patches

A.Wendy · March 27, 2013, 05:33

Hi everybody,

is there a posibility after running snappyhexmesh etc. a boundary patch in for example 6 pieces along one direction?

the problem is the following:
i splitted a blade in 6 different stl files. the geometry is allways the same but at the region where 2 parts are connected the layer mesh looks very bad. so i want to mesh it as a single patch and splitt it afterwarts into several patches. so that i can extract forces along the blade.

is there a possibility?

best wishes

Andy

A.Wendy · April 2, 2013, 08:06

nobody an idea?

haakon · April 2, 2013, 08:41

Have you seen the new feature in version 2.2 that allows you to do approximately what you want, i.e. write forces in "bins" along a specific direction?

See the release notes: http://www.openfoam.org/version2.2.0...processing.php

A.Wendy · April 3, 2013, 01:46

Quote:

Originally Posted by haakon

Have you seen the new feature in version 2.2 that allows you to do approximately what you want, i.e. write forces in "bins" along a specific direction?

See the release notes: http://www.openfoam.org/version2.2.0...processing.php

hi,

i have to work with OpenFOAM 1.6 extend. Do you know if i can calculate the Forces after finisching the computation?

haakon · April 3, 2013, 02:23

In the case of using 1.6-ext I have no ideas (other than splitting the boundary patch as you suggested). Sorry.

(Perhaps you can take this piece of code back into 1.6-ext? I guess this part is pretty similar).

Akshay · April 15, 2013, 01:50

Hi AW!

Since you have those individual STL's, you could use them to create a faceSet( use topoSet). This faceSet can then be used to create patches using createPatch and you could call your force functions to calculate on these patches. This might work.

Cheers!
Akshay

Akshay · April 15, 2013, 01:59

Or...
You could use 'sample' utility. This works on STLs. But i doubt if the extend version has the 'SampledtriSurfaceMesh' type. But I believe you could setup the 2.1 'sample' code in your environment.

Cheers
Akshay

March 27, 2013, 05:33	splitting boundary patch into several patches	#1
A.Wendy Member Andreas Wendy Join Date: Aug 2012 Posts: 63 Rep Power: 2	Hi everybody, is there a posibility after running snappyhexmesh etc. a boundary patch in for example 6 pieces along one direction? the problem is the following: i splitted a blade in 6 different stl files. the geometry is allways the same but at the region where 2 parts are connected the layer mesh looks very bad. so i want to mesh it as a single patch and splitt it afterwarts into several patches. so that i can extract forces along the blade. is there a possibility? best wishes Andy

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April 2, 2013, 08:06		#2
A.Wendy Member Andreas Wendy Join Date: Aug 2012 Posts: 63 Rep Power: 2	nobody an idea?

April 2, 2013, 08:41		#3
haakon Member Håkon Strandenes Join Date: Dec 2011 Location: Norway Posts: 53 Rep Power: 3	Have you seen the new feature in version 2.2 that allows you to do approximately what you want, i.e. write forces in "bins" along a specific direction? See the release notes: http://www.openfoam.org/version2.2.0...processing.php

April 3, 2013, 02:23		#5
haakon Member Håkon Strandenes Join Date: Dec 2011 Location: Norway Posts: 53 Rep Power: 3	In the case of using 1.6-ext I have no ideas (other than splitting the boundary patch as you suggested). Sorry. (Perhaps you can take this piece of code back into 1.6-ext? I guess this part is pretty similar).

April 15, 2013, 01:50		#6
Akshay New Member Akshay Kumar Join Date: Aug 2010 Posts: 20 Rep Power: 4	Hi AW! Since you have those individual STL's, you could use them to create a faceSet( use topoSet). This faceSet can then be used to create patches using createPatch and you could call your force functions to calculate on these patches. This might work. Cheers! Akshay

April 15, 2013, 01:59		#7
Akshay New Member Akshay Kumar Join Date: Aug 2010 Posts: 20 Rep Power: 4	Or... You could use 'sample' utility. This works on STLs. But i doubt if the extend version has the 'SampledtriSurfaceMesh' type. But I believe you could setup the 2.1 'sample' code in your environment. Cheers Akshay