CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

diffusivity selection for modified displacementLaplacian solver for FSI problems

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 23, 2016, 11:02
Default diffusivity selection for modified displacementLaplacian solver for FSI problems
  #1
New Member
 
ZHENKAI ZHAO
Join Date: Oct 2015
Posts: 14
Rep Power: 10
zhaozhenkai is on a distinguished road
Hi, guys,

I have encountered a severe problem about dynamic mesh motion.

I used my modified displacementLaplacian Solver to couple with external software to deal with FSI multi-body motion problem. the settings in my dynamicMeshDict is as follows:

Code:
dynamicFvMesh      dynamicMotionSolverFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

solver           MBdisplacementLaplaciancouple;
 
MBdisplacementLaplaciancoupleCoeffs
{
  diffusivity   quadratic inverseDistance (wing1 wing2 wing3);
  patches1    (wing1);
  patches2    (wing2);
  patches3    (wing3);
  rhoName    rhoInf;
  rhoInf    1000;
}
I have got some questions to ask for my settings

1. how did diffusivity solver works? it solver for each patch one by one, or it solves all the patches at the same time?

2. I saw some case put the number 1 behind inverseDistance, what does that mean?

3. for the moving patches, I have set the BC as fixedValue in the pointDisplacement file, is that right. I have tried to use calculated BC but error occurred.

4. I have attached some images showing my incorrect mesh motion for internal mesh that caused wrong oriented faces near the patch. I guess that is because when I get all the patch data from external solver correctly, the internal mesh solved by OpenFOAM didnot move together correctly with the patch so the error appears as in the image. Dose it corresponding to any of my settings in the dynamicMeshDict?

Any help from any Foamer is much appreciated.
Attached Images
File Type: png b.png (29.7 KB, 52 views)
File Type: png a.png (35.8 KB, 36 views)
zhaozhenkai is offline   Reply With Quote

Old   November 10, 2016, 14:43
Default
  #2
New Member
 
mobina.h.miri
Join Date: Jul 2015
Posts: 3
Rep Power: 10
mobina is on a distinguished road
Hi dear zhao
could you find how to solve this issue?
I want to put 3 patches in diffusivity but i can't find how to fix it.
thank you
mobina is offline   Reply With Quote

Old   November 11, 2016, 05:41
Default
  #3
New Member
 
ZHENKAI ZHAO
Join Date: Oct 2015
Posts: 14
Rep Power: 10
zhaozhenkai is on a distinguished road
Quote:
Originally Posted by mobina View Post
Hi dear zhao
could you find how to solve this issue?
I want to put 3 patches in diffusivity but i can't find how to fix it.
thank you
Hi, mobina,

Do you want to put 3 patches into the laplacian solver that contains solving diffusivity or just want to put 3 patch names in the dynamicMeshDict?

If you want to put 3 patches in the dynamicMeshDict, Just do what I have written in the previous post. Don't put number '1' behind the inverseDistance as it can only be used when you have 1 patch.

Also, you need to lookup the patch name specified in dynamicMeshDict in your corresponding laplacianSolver, or maybe SBRStressSolver.

ZHENKAI
zhaozhenkai 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
[ANSYS Meshing] Script Connection Friction arpeedesign ANSYS Meshing & Geometry 4 April 11, 2019 08:17
mach number and selection of the fluent solver turbinesv FLUENT 4 April 24, 2011 00:14
Working directory via command line Luiz CFX 4 March 6, 2011 20:02
Questions to Dynamic Mesh solver and diffusivity florian_krause OpenFOAM Running, Solving & CFD 12 January 11, 2008 21:33
compressible two phase flow in CFX4.4 youngan CFX 0 July 1, 2003 23:32


All times are GMT -4. The time now is 06:07.