CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > SU2

Problem with restart in FSI unsteady simulation

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 20, 2018, 09:44
Lightbulb Problem with restart in FSI unsteady simulation
New Member
David Mocholi Gonzalez
Join Date: Mar 2018
Posts: 1
Rep Power: 0
david_mocholi is on a distinguished road

I'm currently working in a FSI software implementation using the python bindings from the SU2 pywrapper. As a baseline for my implementation I used the found inside the py_wrapper_folder in TestCases. Prior to execute the FSI unsteady simulation I run a steady case with SU2 in order to use the converged parameters of the steady solution as the initial condition for the unsteady case. To do so, I am using the restart solution option in the PROBLEM DEFINITION part of the configure file (RESTART_SOL= YES) as well as the corresponding options in the UNSTEADY SIMULATION part (UNSTEADY_SIMULATION= DUAL_TIME_STEPPING-2ND_ORDER and UNST_RESTART_ITER= 2). When I run the unsteady simulation with these parameters, SU2 seems to be reading properly both restart files needed for the second order dual time stepping. However, a closer look in the results shows that the first unsteady iteration does not start from the converged parameters ( Residuals, Cl and Cd) coming from the steady case.

Trying to track down the source of the error, I found that the the restart works as expected just running an unsteady case without grid deformation. What means that the problem comes from the way of applying the neccesary grid deformation for a FSI simulation (GRID_MOVEMENT_KIND= FLUID_STRUCTURE). I checked the source code defining the grid movement ( grid_movement_structure.cpp and iteration_structure.cpp) and I found that somehow for the FLUID_STRUCTURE case the stat_mesh boolean variable (static mesh) was set to TRUE. As a first possible solution a changed that to be FALSE, in order for the code to access what I found to be a necessary function to properly execute the restart.

This solution is working so far, but I'm not completely sure if I am overcomplicating things here and there is a simpler solution to this issue. So... have anyone experienced a similar problem??

Thank's in advanced

david_mocholi is offline   Reply With Quote

Old   June 24, 2023, 06:06
New Member
Join Date: Oct 2021
Location: Bangalore, India
Posts: 6
Rep Power: 4
mag10100 is on a distinguished road

How did you solve it?
mag10100 is offline   Reply With Quote


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
Unsteady Turbomachinery Simulation Andrew2 Main CFD Forum 0 December 1, 2016 20:09
Rigid body motion error when restarting a terminated FSI simulation lingdeer ANSYS 1 May 19, 2013 01:40
Problem within simulation after restart :A face cannot be split into triangles. aziz56 STAR-CD 1 January 26, 2012 10:41
Problem about FLUENT-MPCCI-ABAQUS FSI simulation! whpsoft FLUENT 0 May 24, 2006 10:22
SOS: About VOF-Dynamic mesh unsteady problem whpsoft FLUENT 4 May 9, 2006 19:26

All times are GMT -4. The time now is 22:43.