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

Continuous adjoint VS finite differences

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 26, 2017, 04:59
Default Continuous adjoint VS finite differences
  #1
New Member
 
WANG,Hao
Join Date: Sep 2016
Location: Xi'an China
Posts: 19
Rep Power: 8
Haowang is on a distinguished road
Hello everyone,
I am evaluating the gradients of draft coefficient with respect to FFD design variables through continuous adjoint Navier-Stokes equations. But I found that the results from continuous adjoint don't agree with the results from finite diferences. I am sure my flow solver has fully converged.
Here are my complete configuration file, convergence history of RANS flow solver and adjoint solver, and the comparison between adjoint and finite differences (Yet I have calculated the gradients with respect to only four design variables by finite differences). The step for both cases is 0.001.
Could anyone give me some suggestion about that? Thank you sincerely!
convergence history of RANS and Adjoint.png

opt_crm.txt

Comparison of gradients from adjoint and finite difference.png

Last edited by Haowang; March 26, 2017 at 22:14.
Haowang 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 vs Continuous Adjoint solution variable: Scaling/normalization issue? asitav SU2 2 November 21, 2018 20:11
Gradient Computation: finite differences and adjoint method doan.nak SU2 3 November 22, 2017 06:37
conservative finite differences and finite volumes Joachim Main CFD Forum 7 January 23, 2014 17:32
Inaccurate gradient results from continuous Adjoint method Yminjo SU2 1 January 11, 2014 23:08
Question about Continuous Adjoint Method fumiya Main CFD Forum 6 November 1, 2011 11:09


All times are GMT -4. The time now is 13:31.