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

SU2 For 2D Cascades

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 11, 2015, 10:11
Default SU2 For 2D Cascades
  #1
Member
 
A. S.
Join Date: Apr 2009
Location: Raipur (INDIA)
Posts: 54
Rep Power: 15
apoorv is on a distinguished road
Hi,

I am a novice to C++ and want to use SU2_EDU as platform to learn use it for learning purpose and apply it specifically to turbomachnery.

I have simple question, can I apply periodic boundary for 2d blade analysis. I already have 2d h-grid generator and inviscid solver for it, though in fortran, but would like to use SU2, instead of trying to reinvent the wheel again.

The second question is that can I add customized source term to it as I want tom use for q3d and axi-sym analysis, also whether it has flux adapted to moving domain.

Best Regards

Apurva
apoorv is offline   Reply With Quote

Old   January 16, 2015, 04:05
Default
  #2
Super Moderator
 
Thomas D. Economon
Join Date: Jan 2013
Location: Stanford, CA
Posts: 271
Rep Power: 13
economon is on a distinguished road
Hi Apurva,

Indeed, we have a periodic boundary condition available in the main SU2 suite. In fact, we also have the VKI turbine example that uses the periodic BC within the TestCases repository here: https://github.com/su2code/TestCases.

Note that the periodic BC requires a preprocessing step. You might check out the post here for more info, and note that SU2_PBC has been absorbed into SU2_MSH in the recent versions of SU2: http://www.cfd-online.com/Forums/su2...-tutorial.html.

Lastly, source terms are relatively straightforward to add. We currently have an axisymmetric source term implemented, although I am not sure if you are interested in this particular implementation. You might check out the post here for a little more on source terms: http://www.cfd-online.com/Forums/su2...-equation.html.

Hope this helps,

Thomas D. Economon
SU2 lead developer
economon is offline   Reply With Quote

Old   January 28, 2016, 21:59
Default
  #3
New Member
 
Bartosz
Join Date: May 2014
Posts: 7
Rep Power: 10
Bartosz.Ziegler is on a distinguished road
Hi,
I am also trying to use SU2 for 2D cascades. I am trying to inversely design a 2D cascade geometry for given pressure (or Cp) distribution. I am currently trying to calculate an adjoint solution for the baseline geometry. I don't fully understand the inverse design test case. Among the files there is a file TargetCp.dat in it there is a surface_flow data of a target airfoil (with geometrical coordinates of target airfoil). In my case I simply took the surface_flow.csv from the direct calculation and "replaced" the Cp's from calculation to target Cps. The problem is that when I run SU2_CFD with that file called TargetCp.dat in the directory I get such error after 0th iteration:

Iter Time(s) Res[Psi_Rho] Res[Psi_E] Sens_Geo Sens_Mach
0 0.744626 6.473614 4.015626 1.6721e+05 5.5276e+05
[bartosz-ubuntu:06043] *** Process received signal ***
[bartosz-ubuntu:06043] Signal: Segmentation fault (11)
[bartosz-ubuntu:06043] Signal code: (128)
[bartosz-ubuntu:06043] Failing at address: (nil)
[bartosz-ubuntu:06043] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340) [0x7fed58b15340]
[bartosz-ubuntu:06043] [ 1] SU2_CFD() [0x817fee]
[bartosz-ubuntu:06043] [ 2] SU2_CFD() [0x78b185]
[bartosz-ubuntu:06043] [ 3] SU2_CFD() [0x5e5ee0]
[bartosz-ubuntu:06043] [ 4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fed58761ec5]
[bartosz-ubuntu:06043] [ 5] SU2_CFD() [0x6daade]
[bartosz-ubuntu:06043] *** End of error message ***
Naruszenie ochrony pamięci (core dumped) % memory violation (core dumped), in Polish

But if I run adjoint, with:
OBJECTIVE_FUNCTION= INVERSE_DESIGN_PRESSURE
INV_DESIGN_CP= YES
But without the file TargetCp.dat in the directory then some adjoint solution is calculating. I think I might be missing some general idea about inverse pressure design with SU2. I thought that the target pressure distribution is required for an adjoint calculation. Or maybe the pressure sensitivities are calculated without target distribution and the TargetCp.dat is required for gradient projection (but if so why is it preventing the adjoint from running if in the working directory). I am using the SU2 4.0.0 version (my first open source CFD so I am quite confused with everything).

I would greatly appreciate any help, especially that I am already late with my calculations.

Best Regards
Bartosz Ziegler

Edit: Oh, I found the reason why the SU2 crashed at 0th iteration, in the TargetCp.dat I had values separated with commas but without any other separator (like 1.8888,2.4355,3.4544,...) adding spaces between them helped and the adjoint is calculating but still with poor (very slow) convergence. But that may simply be the nature of transonic cascade flows. Another thing is that I get oscillations in surface sensitivities at blade suction surface, (positive for 2-3 nodes then negative for another 2-3 nodes) while pressure surface is fine. So still any advice could be useful.

Best regards
Bartosz

Last edited by Bartosz.Ziegler; January 29, 2016 at 12:54. Reason: I found the mistake (or at least one of them)
Bartosz.Ziegler is offline   Reply With Quote

Old   January 30, 2016, 08:54
Default
  #4
Member
 
A. S.
Join Date: Apr 2009
Location: Raipur (INDIA)
Posts: 54
Rep Power: 15
apoorv is on a distinguished road
Hi

I am trying inverse design through published open literature. How to do it by Adjoint, I have no idea;my advise may not be helpful

Apoorv
apoorv is offline   Reply With Quote

Old   September 22, 2021, 17:41
Default
  #5
New Member
 
Join Date: Jan 2011
Posts: 22
Rep Power: 14
Speng is on a distinguished road
Apurva,
Did you ever do any of the quasi-3D or Axi-symmetric modifications?

Cliff

Quote:
Originally Posted by apoorv View Post
Hi,
The second question is that can I add customized source term to it as I want tom use for q3d and axi-sym analysis, also whether it has flux adapted to moving domain.

Best Regards

Apurva
Speng 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
Tool to download: SU2 post-processing Combas SU2 2 June 5, 2014 15:55
Pointwise-SU2 joint webinar (April 29th) and SU2 v3.1.0 new release fpalacios SU2 News & Announcements 1 April 30, 2014 03:40
Official release of SU2 V3.0 and SU2 Educational V1.0 fpalacios SU2 News & Announcements 2 January 22, 2014 06:28
Welcome to the Stanford University Unstructured (SU2) forum! economon SU2 0 January 7, 2013 03:48
New SU2 Forum Opened at CFD Online pete Site News & Announcements 0 January 5, 2013 18:59


All times are GMT -4. The time now is 07:29.