CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Method for solving the adjoint equations

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

LinkBack Thread Tools Display Modes
Old   June 12, 2011, 21:31
Default Method for solving the adjoint equations
Senior Member
Fumiya Nozaki
Join Date: Jun 2010
Location: Yokohama, Japan
Posts: 217
Blog Entries: 1
Rep Power: 11
fumiya is on a distinguished road

I have run several cases and found it difficult to obtain a converged
solution of the adjoint N-S equations. I think it is related to the adjoint
transpose convection term. I use the SIMPLE algorithm to couple the
adjoint velocity and pressure.

What should I do to improve convergence of the adjoint equations?
Any information, however small, would be appreciated.

Best regards,
fumiya is offline   Reply With Quote

Old   June 13, 2011, 00:18
New Member
Felipe Hernandez
Join Date: Apr 2011
Posts: 13
Rep Power: 8
Petrov is on a distinguished road
First, check that you should get a solution that converges. For high Re, (even about 40 in some cases), you would get a time-dependent solution. To check that it works for low Re, increase the viscosity, decrease the velocity, etc. If this doesn't work, there is a problem.

I don't know much about the SIMPLE algorithm, but if it involves solving a system of equations, try using a pre-conditioner. Without a pre-conditioner, I was not able to get a good result quickly. I implemented the gauss-siedel conditioner and it works like a charm. (Though maybe I should use SSOR!)

Good luck!
Petrov is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Adjoint solver for flow problems jelmer OpenFOAM Running, Solving & CFD 11 March 12, 2017 07:52
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
CFD governing equations m.gos Main CFD Forum 0 April 30, 2011 14:21
A question about discrete adjoint method Thomas Main CFD Forum 3 August 9, 2006 12:37
What is Density-Based method? C-H Kuo Main CFD Forum 4 November 18, 1998 17:11

All times are GMT -4. The time now is 13:49.