Reference parameter specification in .cfg file for compressible viscous flows

SumanVajjala · June 19, 2014, 03:19

Hi,

I am using SU2 to simulate viscous compressible flows. In creating a .cfg file I want to know how REF_PRESSURE, REF_TEMPERATURE and REF_DENSITY are calculated. Are they freestream values? Also, in Euler simulations FREESTREAM_PRESSURE, FREESTREAM_TEMPERATURE is specified. What is the rationale behind this? Is FREESTREAM_TEMPERATURE different from REF_TEMPERATURE?

As a separate discussion what is the equation for the CFL ramping. In the included testcases (TestCases/rans/oneram6/turb_ONERAM6.cfg) CFL number is greater than CFL limit? Is this correct?

Many Thanks
Suman

fpalacios · June 26, 2014, 00:58

Dear Suman,
The nondimensionalization is described in
http://su2.stanford.edu/documents/SU2_AIAA_ASM2013.pdf
If you are interested, the implementation is in
void CConfig::SetNondimensionalization(unsigned short val_nDim, unsigned short val_iZone)

The CFL ramp is described in

void CConfig::UpdateCFL(unsigned long val_iter)

Thanks for using Su2,
Cheers,
Francisco

June 19, 2014, 03:19	Reference parameter specification in .cfg file for compressible viscous flows	#1
SumanVajjala New Member Suman Vajjala Join Date: Jun 2014 Posts: 4 Rep Power: 12	Hi, I am using SU2 to simulate viscous compressible flows. In creating a .cfg file I want to know how REF_PRESSURE, REF_TEMPERATURE and REF_DENSITY are calculated. Are they freestream values? Also, in Euler simulations FREESTREAM_PRESSURE, FREESTREAM_TEMPERATURE is specified. What is the rationale behind this? Is FREESTREAM_TEMPERATURE different from REF_TEMPERATURE? As a separate discussion what is the equation for the CFL ramping. In the included testcases (TestCases/rans/oneram6/turb_ONERAM6.cfg) CFL number is greater than CFL limit? Is this correct? Many Thanks Suman

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June 26, 2014, 00:58		#2
fpalacios Super Moderator Francisco Palacios Join Date: Jan 2013 Location: Long Beach, CA Posts: 404 Rep Power: 15	Dear Suman, The nondimensionalization is described in http://su2.stanford.edu/documents/SU2_AIAA_ASM2013.pdf If you are interested, the implementation is in void CConfig::SetNondimensionalization(unsigned short val_nDim, unsigned short val_iZone) The CFL ramp is described in void CConfig::UpdateCFL(unsigned long val_iter) Thanks for using Su2, Cheers, Francisco