[GAMBIT] Meshing in Gambit for analysis of flow past cylinders

PSYMN · February 25, 2012, 17:51

With mapped hexa blocks, the number of nodes on parallel edges must match (except where they are multiplied by a refinement factor).

For instance, if you have 10 nodes across one index, it must be the same the whole way across your model. You can't just set one particular edge to 7 nodes... that 7 must propagate.

The option to propagate distributions is for the "distribution" (the mesh law, initial spacing, etc.), the number of nodes must be propagated...

Far · March 11, 2012, 01:22

@PSYMN: Any solution to this problem (mesh refinement) for 2-D grids in ICEM

PSYMN · March 13, 2012, 09:33

@Far... It is a defect and has been reported. It should be sorted out for 14.5.

Far · March 13, 2012, 10:09

Thankyou very much for very detailed analysis about problem and your time. As I can see things are improving at rapid pace at ANSYS (especially due to Sr product manager

)

Far · March 28, 2012, 14:59

Quote:

With mapped hexa blocks, the number of nodes on parallel edges must match

I saw one of your presentations where you have explained that by deleting (permanently) the inner block of cylinder we can avoid this constraint on parallel edges.

Far · April 2, 2012, 09:49

I made the youtube tutorial on how to create mesh of circular cylinder in ICEM.
This is two part video tutorial.http://www.cfd-online.com/Forums/ans...-tutorial.html

Far · October 24, 2017, 03:27

This time i have solved this flow (Re=40) using chimera/overset mesh. And Cd comes out to be 1.518. So there is not much difference in results.

February 25, 2012, 17:51		#61
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	With mapped hexa blocks, the number of nodes on parallel edges must match (except where they are multiplied by a refinement factor). For instance, if you have 10 nodes across one index, it must be the same the whole way across your model. You can't just set one particular edge to 7 nodes... that 7 must propagate. The option to propagate distributions is for the "distribution" (the mesh law, initial spacing, etc.), the number of nodes must be propagated... lth likes this. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

March 13, 2012, 09:33		#63
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	@Far... It is a defect and has been reported. It should be sorted out for 14.5. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

March 13, 2012, 10:09	Thankyou	#64
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	Thankyou very much for very detailed analysis about problem and your time. As I can see things are improving at rapid pace at ANSYS (especially due to Sr product manager ) Last edited by Far; March 13, 2012 at 10:28.

April 2, 2012, 09:49		#66
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	I made the youtube tutorial on how to create mesh of circular cylinder in ICEM. This is two part video tutorial.http://www.cfd-online.com/Forums/ans...-tutorial.html Last edited by Far; April 2, 2012 at 23:23. Reason: correct link

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March 11, 2012, 01:22		#62
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	@PSYMN: Any solution to this problem (mesh refinement) for 2-D grids in ICEM