low mach number flow in su2

punyaplaban · August 24, 2020, 16:09

Hi there,
I was just trying to simulate my own wing joined to a cylindrical fuselage in SU2. For the transonic regime, JST gave pretty good results. However, when I try to simulate at low mach numbers (incompressible regime), the solution does not converge. I am using ROE scheme with MUSCL_FLOW = YES. Any suggestions about running the test case at low mach numbers? Can anyone explain how to impose artificial compressibility in SU2 for these low mach numbers and how to impose low mach number preconditioning?
Thanks in advance!

akoodlyr · August 25, 2020, 05:25

Hello,

You will have to use the incompressible solver. You can find examples and tutorials to set up here https://su2code.github.io/tutorials/...lent_NACA0012/ for example.

Cheers

aero_amit · August 25, 2020, 11:49

You can also try low Mach schemes like AUSMPLUSUP and SLAU. These schemes do well for Mach 0.01 or even lower (proper scaling of numerical dissipation). But without Time derivative preconditioning, I recommend you to use them upto Mach 0.1 and also add option USE_ACCURATE_FLUX_JACOBIANS = YES with above schemes (AUSMPLUSUP/UP2 or SLAU/SLAU2).

punyaplaban · September 10, 2020, 14:43

Thanks for the reply @aero.amit. I have tried LOW_MACH_CORR = YES and MUSCL_FLOW = YES options but that did not help. Does only USE_ACCURATE_FLUX_JACOBIANS = YES suffice for low mach case with the schemes you have suggested?

punyaplaban · September 10, 2020, 14:45

Thanks for the reply @akoodlyr. I have tried that but that did not help. Any other suggestions would be great.

aero_amit · September 12, 2020, 08:50

Quote:

Originally Posted by punyaplaban

Thanks for the reply @aero.amit. I have tried LOW_MACH_CORR = YES and MUSCL_FLOW = YES options but that did not help. Does only USE_ACCURATE_FLUX_JACOBIANS = YES suffice for low mach case with the schemes you have suggested?

Did you try AUSMPLUSUP scheme instead of JST?

punyaplaban · September 12, 2020, 15:29

No, I have not tried that. Are you saying to try AUSMPLUSUP with USE_ACCURATE_FLUX_JACOBIANS = YES setting? Should I turn the MUSCL_FLOW = YES also for a second order scheme?

aero_amit · September 12, 2020, 16:02

Yes, try the above settings

August 24, 2020, 16:09	low mach number flow in su2	#1
punyaplaban New Member Join Date: Jun 2020 Posts: 14 Rep Power: 6	Hi there, I was just trying to simulate my own wing joined to a cylindrical fuselage in SU2. For the transonic regime, JST gave pretty good results. However, when I try to simulate at low mach numbers (incompressible regime), the solution does not converge. I am using ROE scheme with MUSCL_FLOW = YES. Any suggestions about running the test case at low mach numbers? Can anyone explain how to impose artificial compressibility in SU2 for these low mach numbers and how to impose low mach number preconditioning? Thanks in advance!

August 25, 2020, 11:49		#3
aero_amit Member Amit Join Date: May 2013 Posts: 85 Rep Power: 13	You can also try low Mach schemes like AUSMPLUSUP and SLAU. These schemes do well for Mach 0.01 or even lower (proper scaling of numerical dissipation). But without Time derivative preconditioning, I recommend you to use them upto Mach 0.1 and also add option USE_ACCURATE_FLUX_JACOBIANS = YES with above schemes (AUSMPLUSUP/UP2 or SLAU/SLAU2). Last edited by aero_amit; September 12, 2020 at 16:05.

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August 25, 2020, 05:25		#2
akoodlyr Member Akshay Koodly Join Date: Aug 2017 Location: The Netherlands Posts: 43 Rep Power: 9	Hello, You will have to use the incompressible solver. You can find examples and tutorials to set up here https://su2code.github.io/tutorials/...lent_NACA0012/ for example. Cheers

September 10, 2020, 14:43		#4
punyaplaban New Member Join Date: Jun 2020 Posts: 14 Rep Power: 6	Thanks for the reply @aero.amit. I have tried LOW_MACH_CORR = YES and MUSCL_FLOW = YES options but that did not help. Does only USE_ACCURATE_FLUX_JACOBIANS = YES suffice for low mach case with the schemes you have suggested?

September 10, 2020, 14:45		#5
punyaplaban New Member Join Date: Jun 2020 Posts: 14 Rep Power: 6	Thanks for the reply @akoodlyr. I have tried that but that did not help. Any other suggestions would be great.

September 12, 2020, 15:29		#7
punyaplaban New Member Join Date: Jun 2020 Posts: 14 Rep Power: 6	No, I have not tried that. Are you saying to try AUSMPLUSUP with USE_ACCURATE_FLUX_JACOBIANS = YES setting? Should I turn the MUSCL_FLOW = YES also for a second order scheme?

September 12, 2020, 16:02		#8
aero_amit Member Amit Join Date: May 2013 Posts: 85 Rep Power: 13	Yes, try the above settings