[blockMesh] blockMesh cylinder with two inlets

cfd4res · March 7, 2018, 04:53

Hello everyone. I am new to openFOAM. I managed to blockmesh a cylinder using the m4 file in this link.
https://www.ehsanmadadi.com/cylinder-mesh/

Then I want to create a second inlet on the wall as shown in the image attached. Can anyone please tell me how to write this in blockmesh.
pipe.JPG

piu58 · March 7, 2018, 05:10

Very probably there exist some ways to handle this.

If I had to manage this case, I would generate a regular cylinder with a slightly different formulation for the wall speed (which is zero in most places at the wall).

It is possible to use for a surface a nonuniform velocity in the form

Code:

type  fixedValue;
value nonuniform List<vector> {elements} (
   (ux0 uy0 uz0)
   (ux1 uy1 uz1)
   :
)

You have to play around a little bit to catch the right elements with non zeror velocity, but there is some kind of systematic in it (which depends on how you build your blocks)

cfd4res · March 7, 2018, 05:23

Thank you very much for the quick reply. Really appreciate it. I will definitely try this.

Antimony · March 7, 2018, 21:44

Hi,

If you are using OF 5, then you could try their new "project" feature: https://cfd.direct/openfoam/user-guide/blockmesh/

(Look for section 5.3.3)

Cheers,
Antimony

cfd4res · March 9, 2018, 12:02

Thank you very much for the info. Really appreciate it. I will try this.

March 7, 2018, 04:53	blockMesh cylinder with two inlets	#1
cfd4res New Member anonymous Join Date: Mar 2018 Posts: 11 Rep Power: 8	Hello everyone. I am new to openFOAM. I managed to blockmesh a cylinder using the m4 file in this link. https://www.ehsanmadadi.com/cylinder-mesh/ Then I want to create a second inlet on the wall as shown in the image attached. Can anyone please tell me how to write this in blockmesh. pipe.JPG

March 7, 2018, 05:10		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	Very probably there exist some ways to handle this. If I had to manage this case, I would generate a regular cylinder with a slightly different formulation for the wall speed (which is zero in most places at the wall). It is possible to use for a surface a nonuniform velocity in the form Code: type fixedValue; value nonuniform List<vector> {elements} ( (ux0 uy0 uz0) (ux1 uy1 uz1) : ) You have to play around a little bit to catch the right elements with non zeror velocity, but there is some kind of systematic in it (which depends on how you build your blocks) cfd4res likes this. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

March 7, 2018, 21:44		#4
Antimony Senior Member Join Date: Aug 2013 Posts: 407 Rep Power: 15	Hi, If you are using OF 5, then you could try their new "project" feature: https://cfd.direct/openfoam/user-guide/blockmesh/ (Look for section 5.3.3) Cheers, Antimony cfd4res likes this.

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March 7, 2018, 05:23		#3
cfd4res New Member anonymous Join Date: Mar 2018 Posts: 11 Rep Power: 8	Thank you very much for the quick reply. Really appreciate it. I will definitely try this.

March 9, 2018, 12:02		#5
cfd4res New Member anonymous Join Date: Mar 2018 Posts: 11 Rep Power: 8	Thank you very much for the info. Really appreciate it. I will try this.