[mesh manipulation] Define patches after MirrorMesh

janepen · May 2, 2013, 12:05

Hi, I am trying to create a mesh with four identical cylinders in a domain. Then I want to define different patch name for these four cylinders.

I firstly create a cylinder in a quarter domain (1/4), and defined the patch name for this cylinder (namely, 'pile1'). I then mirror twice to get the whole domain with four cylinders inside.

Finally, the patch 'pile1' contains four cylinders, which is not what I want to.
Anyone can help me to solve this problem? thanks.

John

janepen · May 3, 2013, 07:17

I have solved my problem, thank you anyway.

Simply select the pile1 patch, copy it to four patches with different name, then
divide the number of faces by the number of cylinders, and change the start face accordingly.

Wish it helps your problem.

ngj · May 3, 2013, 08:17

Hi John,

Another way could have been to use the createPatch utility. If I remember correctly, then you can select some boundary faces and assign these to a different patch. This could avoid problems in the manual typing of the startFace and number of faces.

See the dictionary here:

Code:

<OF-path>/applications/utilities/mesh/manipulation/createPatch/createPatchDict

Kind regards

Niels

May 2, 2013, 12:05	Define patches after MirrorMesh	#1
janepen New Member John Peng Join Date: Oct 2012 Location: NL Posts: 7 Rep Power: 14	Hi, I am trying to create a mesh with four identical cylinders in a domain. Then I want to define different patch name for these four cylinders. I firstly create a cylinder in a quarter domain (1/4), and defined the patch name for this cylinder (namely, 'pile1'). I then mirror twice to get the whole domain with four cylinders inside. Finally, the patch 'pile1' contains four cylinders, which is not what I want to. Anyone can help me to solve this problem? thanks. John

May 3, 2013, 08:17		#3
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Hi John, Another way could have been to use the createPatch utility. If I remember correctly, then you can select some boundary faces and assign these to a different patch. This could avoid problems in the manual typing of the startFace and number of faces. See the dictionary here: Code: <OF-path>/applications/utilities/mesh/manipulation/createPatch/createPatchDict Kind regards Niels

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May 3, 2013, 07:17		#2
janepen New Member John Peng Join Date: Oct 2012 Location: NL Posts: 7 Rep Power: 14	I have solved my problem, thank you anyway. Simply select the pile1 patch, copy it to four patches with different name, then divide the number of faces by the number of cylinders, and change the start face accordingly. Wish it helps your problem.