CFX multi grid method

manupanand · November 23, 2022, 02:10

I have a few questions.

1) Is CFX using multigrid method? If yes how to enable it in CFX?

2)How can we change solver methodology change discretization schemes in CFX?

3) How to enable eularian or lagrangian approach?

where can I find solver control?

I am new to CFX

ghorrocks · November 23, 2022, 04:23

Yes, CFX uses a multigrid method for the linear solver. It is already activated by default.

Assuming by "discretisation scheme" you mean advection, transient and diffusion scheme - yes, you can change these.

You cannot change the coupled solver approach, it is the only one available. So you cannot use SIMPLE or something like that.

The Eulerian and Lagrangian approaches are both available under multiphase models. Have a look at the multiphase tutorials for how to use them.

manupanand · November 23, 2022, 20:12

Quote:

Originally Posted by ghorrocks

Yes, CFX uses a multigrid method for the linear solver. It is already activated by default.

Assuming by "discretisation scheme" you mean advection, transient and diffusion scheme - yes, you can change these.

You cannot change the coupled solver approach, it is the only one available. So you cannot use SIMPLE or something like that.

The Eulerian and Lagrangian approaches are both available under multiphase models. Have a look at the multiphase tutorials for how to use them.

Thank you, for the valuable inputs

November 23, 2022, 02:10	CFX multi grid method	#1
manupanand Member MANU P ANAND Join Date: Jul 2014 Location: Daegu , REPUBLIC OF KOREA Posts: 36 Rep Power: 12	I have a few questions. 1) Is CFX using multigrid method? If yes how to enable it in CFX? 2)How can we change solver methodology change discretization schemes in CFX? 3) How to enable eularian or lagrangian approach? where can I find solver control? I am new to CFX

November 23, 2022, 04:23		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,781 Rep Power: 143	Yes, CFX uses a multigrid method for the linear solver. It is already activated by default. Assuming by "discretisation scheme" you mean advection, transient and diffusion scheme - yes, you can change these. You cannot change the coupled solver approach, it is the only one available. So you cannot use SIMPLE or something like that. The Eulerian and Lagrangian approaches are both available under multiphase models. Have a look at the multiphase tutorials for how to use them. Opaque and manupanand like this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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