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

Fluid Solid Interface

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 27, 2014, 00:48
Default Fluid Solid Interface
  #1
New Member
 
Nikini Gamage
Join Date: Aug 2014
Posts: 7
Rep Power: 12
npuh002 is on a distinguished road
Hi Everyone.

I am running a FSI simulation on ANSYS 14 (I am new to FSI simulations in ANSYS).

The problem that I am currently trying to solve is attached. It is very similar to the "Oscillating Plate with Two-Way Fluid-Structure Interaction" tutorial. However in my problem the fluid is enclosed inside a cylindrical shell. A force is exerted onto the top of the gel and I am trying to figure how it behaves with the fluid (Water).

Currently it solves the structural side of things in the first iteration however when it tries to sync the structural output to FLUENT, it gives me the following error.

"System Coupling Exception
Origin : Fluid Flow (FLUENT) (Solution 2)
Error Code : 2
Error Description :
Fluent encountered fatal error after sync point Solve
"

Not too sure what this error means or how to get over it. Any help would be greatly appreciated.

I can upload my model if that would help.

Cheers,
Nikini
Attached Images
File Type: jpg Diagram.jpg (9.7 KB, 40 views)
npuh002 is offline   Reply With Quote

Old   August 27, 2014, 18:24
Default
  #2
Senior Member
 
Join Date: Apr 2009
Posts: 531
Rep Power: 21
stumpy is on a distinguished road
The error just means Fluent failed. You'd have to look at the Fluent log to find out why.

I would recommend going through the Fluent FSI training material which can be downloaded from the ANSYS customer portal. It has some best practice advice and should help you figure out the problem. You should look at the force and displacement values that are getting passed to see if they are reasonable.
stumpy is offline   Reply With Quote

Old   September 1, 2014, 01:34
Default
  #3
New Member
 
Nikini Gamage
Join Date: Aug 2014
Posts: 7
Rep Power: 12
npuh002 is on a distinguished road
Hi Stumpy,

I have gone through the tutorials and set up my model to to the best of my ability. I am still stuck on this error.
I don't think it is the time stepping, ( I have reduced it and gives me the same error). I even applied the force in the middle of the simulation to check if it was due to passinf of the load from the gel, but it still gave the same error.
I have made sure that the Fluid Solid Interaction is set up in the structural side of things and also made the system coupling dynamic mesh in the fluent side of things. I also activated the appropriate remeshing and smoothing options in Fluent.

Really stumped with this one.

Cheers,
Nikini
npuh002 is offline   Reply With Quote

Old   September 18, 2014, 03:35
Default Problem solved?
  #4
New Member
 
Philipp
Join Date: Jul 2014
Posts: 6
Rep Power: 12
newuser! is on a distinguished road
Hi Nikini,

did you solved the problem?
I am going to model a quite similar system.... did you also tried to use CFX instead of Fluent?

Best regards
Philipp
newuser! is offline   Reply With Quote

Old   September 27, 2014, 08:54
Default
  #5
New Member
 
Nikini Gamage
Join Date: Aug 2014
Posts: 7
Rep Power: 12
npuh002 is on a distinguished road
Hi,

Yeah I did solve this problem. Now moving onto realistic models... not going to be fun.
The main problem was that I was using and the automatic section called 'water-interior' as my internal deformable nodes. However this was not correct. i should have used the another one called just 'water'. I also had to change some of the remshing properties. But those are problem specific.

Cheers,
Nikini
npuh002 is offline   Reply With Quote

Reply

Tags
ansys, fleunt, fsi


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
An error has occurred in cfx5solve: volo87 CFX 5 June 14, 2013 18:44
Problem Interface Solid Fluid with wall velocity Solver v12 hills1 CFX 2 October 12, 2009 06:36
increasing mesh quality is leading to poor convergence tippo CFX 2 May 5, 2009 11:55
Concentric tube heat exchanger (Air-Water) Young CFX 5 October 7, 2008 00:17
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55


All times are GMT -4. The time now is 12:44.