ROE-TURKEL Preconditioning

Akash C · July 29, 2013, 07:34

Hi,
I have seen Roe-Turkel preconditioning being mentioned in one of the pictures at SU2's twitter account for low mach numbers. I was wondering how to enable it.
I tried specifying the following in the initial portion of config file for the simulation problem definition(got the clue from Cconfig class)

Code:

ROE_TURKEL_PREC= YES

But this doesn't seem to work and the history graph with and without the preconditioning show the same trend. Or should I change the default false value in the source code and recompile it for the time being.

I am trying an external aerodynamic case using a mach no. of 0.062, using the incompressible formulation I obtained pretty descent results and was hoping for a better correlation with the preconditioning turned on.

Please correct me if I am going wrong.
Akash

economon · August 19, 2013, 17:09

Hi Akash,

Roe-Turkel preconditioning (ROE_TURKEL_PREC= YES) is set up to work with the compressible solver only when choosing also the Roe method for computing convective fluxes (CONV_NUM_METHOD_FLOW= ROE-1ST_ORDER or 2nd order).

Hope this helps!
Tom

July 29, 2013, 07:34	ROE-TURKEL Preconditioning	#1
Akash C Member Akash Chaudhari Join Date: Dec 2012 Location: Pune, India Posts: 31 Rep Power: 14	Hi, I have seen Roe-Turkel preconditioning being mentioned in one of the pictures at SU2's twitter account for low mach numbers. I was wondering how to enable it. I tried specifying the following in the initial portion of config file for the simulation problem definition(got the clue from Cconfig class) Code: ROE_TURKEL_PREC= YES But this doesn't seem to work and the history graph with and without the preconditioning show the same trend. Or should I change the default false value in the source code and recompile it for the time being. I am trying an external aerodynamic case using a mach no. of 0.062, using the incompressible formulation I obtained pretty descent results and was hoping for a better correlation with the preconditioning turned on. Please correct me if I am going wrong. Akash

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August 19, 2013, 17:09		#2
economon Super Moderator Thomas D. Economon Join Date: Jan 2013 Location: Stanford, CA Posts: 271 Rep Power: 15	Hi Akash, Roe-Turkel preconditioning (ROE_TURKEL_PREC= YES) is set up to work with the compressible solver only when choosing also the Roe method for computing convective fluxes (CONV_NUM_METHOD_FLOW= ROE-1ST_ORDER or 2nd order). Hope this helps! Tom