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

Questions regarding Discrete Adjoint Solver

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

Like Tree1Likes
  • 1 Post By Sprotte

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 19, 2021, 11:21
Default Questions regarding Discrete Adjoint Solver
  #1
Member
 
Join Date: Jun 2020
Posts: 30
Rep Power: 5
Daaman is on a distinguished road
Hi,

I tried simulating the Test case of Onera M6 using the SU2's discrete adjoint solver. I am new to the implementation of the sensitivity solver and trying to analyze the results generated from the implementation, and have the following questions-

1. What is the difference between the Surface_Sensitivity contours generated by surface_adjoint.szplt and surface_sens.szplt? Which ones are usually used for representing the sensitivity of the objective function wrt to design variables?

2. What does FINDIFF_STEP in of_grad_cd.csv represent?

I'm using v 7.1.1. I have attached the config file and gradient results as well.

I appreciate any inputs! Thanks!
Attached Files
File Type: txt of_grad_cd.txt (10.3 KB, 5 views)
File Type: txt Adjoint_Onera_M6.txt (29.0 KB, 3 views)

Last edited by Daaman; April 21, 2021 at 15:51.
Daaman is offline   Reply With Quote

Old   April 24, 2021, 06:25
Default
  #2
Member
 
Ole Burghardt
Join Date: Mar 2016
Location: Kiel, Germany
Posts: 60
Rep Power: 9
Sprotte is on a distinguished road
Hi,

Quote:
Originally Posted by Daaman View Post
1. What is the difference between the Surface_Sensitivity contours generated by surface_adjoint.szplt and surface_sens.szplt? Which ones are usually used for representing the sensitivity of the objective function wrt to design variables?

The first is the adjoint solution (from which sensitivities are derived, it's the objective function sensitivity w.r.t. flow solution), the latter is the objective function sensitivity w.r.t. surface mesh coordinates including mesh deformation, i.e. surface mesh coordinates as design variables.



Quote:
Originally Posted by Daaman View Post
2. What does FINDIFF_STEP in of_grad_cd.csv represent?
FINDIFF is used for finite differences, adjoints don't use it.

Best, Ole
Daaman likes this.
Sprotte 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
Discrete adjoint - Derivatives of the target function w.r.t. boundary conditions CFDEng1234 SU2 2 February 19, 2020 11:39
SU2 Discrete Adjoint Error!!!! vishu343 SU2 4 October 15, 2019 19:55
Discrete adjoint for multi-zone problems pgdelaserna SU2 0 September 18, 2019 05:44
Problems launching adjoint max_ SU2 2 March 12, 2016 12:32
hard to convergent with SU2 4.0 for Euler adjoint Xianguu SU2 1 July 14, 2015 18:09


All times are GMT -4. The time now is 11:19.