CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > SU2

low mach number flow in su2

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 24, 2020, 16:09
Default low mach number flow in su2
  #1
New Member
 
Join Date: Jun 2020
Posts: 14
Rep Power: 6
punyaplaban is on a distinguished road
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!
punyaplaban is offline   Reply With Quote

Old   August 25, 2020, 05:25
Default
  #2
Member
 
Akshay Koodly
Join Date: Aug 2017
Location: The Netherlands
Posts: 43
Rep Power: 9
akoodlyr is on a distinguished road
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
akoodlyr is offline   Reply With Quote

Old   August 25, 2020, 11:49
Default
  #3
Member
 
Amit
Join Date: May 2013
Posts: 85
Rep Power: 13
aero_amit is on a distinguished road
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.
aero_amit is offline   Reply With Quote

Old   September 10, 2020, 14:43
Default
  #4
New Member
 
Join Date: Jun 2020
Posts: 14
Rep Power: 6
punyaplaban is on a distinguished road
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 is offline   Reply With Quote

Old   September 10, 2020, 14:45
Default
  #5
New Member
 
Join Date: Jun 2020
Posts: 14
Rep Power: 6
punyaplaban is on a distinguished road
Thanks for the reply @akoodlyr. I have tried that but that did not help. Any other suggestions would be great.
punyaplaban is offline   Reply With Quote

Old   September 12, 2020, 08:50
Default
  #6
Member
 
Amit
Join Date: May 2013
Posts: 85
Rep Power: 13
aero_amit is on a distinguished road
Quote:
Originally Posted by punyaplaban View Post
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?
aero_amit is offline   Reply With Quote

Old   September 12, 2020, 15:29
Default
  #7
New Member
 
Join Date: Jun 2020
Posts: 14
Rep Power: 6
punyaplaban is on a distinguished road
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?
punyaplaban is offline   Reply With Quote

Old   September 12, 2020, 16:02
Default
  #8
Member
 
Amit
Join Date: May 2013
Posts: 85
Rep Power: 13
aero_amit is on a distinguished road
Yes, try the above settings
aero_amit is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Foam::error::PrintStack almir OpenFOAM Running, Solving & CFD 92 May 21, 2024 08:56
[snappyHexMesh] Error snappyhexmesh - Multiple outside loops avinashjagdale OpenFOAM Meshing & Mesh Conversion 53 March 8, 2019 10:42
[OpenFOAM.org] OF2.3.1 + OS13.2 - Trying to use the dummy Pstream library aylalisa OpenFOAM Installation 23 June 15, 2015 15:49
[blockMesh] --> foam fatal error: lillo763 OpenFOAM Meshing & Mesh Conversion 0 March 5, 2014 11:27
Turbulent flow at low Mach number robyTKD SU2 5 January 3, 2014 04:18


All times are GMT -4. The time now is 11:29.