CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Co-simulation between two flow simulations

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

Like Tree1Likes
  • 1 Post By km.sergeenko

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 23, 2015, 09:44
Question Co-simulation between two flow simulations
  #1
Member
 
Join Date: Oct 2011
Location: Thessaloniki, Greece
Posts: 75
Rep Power: 11
crevoise is on a distinguished road
Hello

I am wondering if a co-simulation between 2 flow simulations in StarCCM+ is possible.
So far, from what am reading on the user manual, it seems only fluid - solid co-simulation can be done.

My problem is the following: I have one part (let call it Part2) of my geometry which has fixed definition.
However, I have several different Part1 connected to it, that I want to test, which are provided independently to me. My aim is to be able to run Part1 and Part2 together without having to do much actions.
I was wondering if it was possible to do a co-simulation of these two parts, by coupling the outlet of Part1 to Inlet of Part2. For the moment, I am not successful in doing so. I could do it with table exportation, but I would much prefer co-simulation. Does anyone has hint on this?

Thanks a lot
crevoise is offline   Reply With Quote

Old   March 23, 2015, 12:31
Default
  #2
Senior Member
 
Matt
Join Date: Aug 2014
Posts: 859
Rep Power: 14
fluid23 is on a distinguished road
I replied in another thread about this, but I think you are exactly describing the function of co-sim. If you are having issues getting it to work, you may want to contact tech support. They are very responsive to all issues. For reference, a clip from the help files is below...

'STAR-CCM+ allows you to couple two running simulations together in a co-simulation analysis. The STAR-CCM+ to STAR-CCM+ co-simulation capability targets simulations involving conjugate heat transfer (CHT), fluid-structure interaction (FSI) or exchange of scalar/vector fields across a coupling boundary.'
fluid23 is offline   Reply With Quote

Old   March 24, 2015, 03:47
Default
  #3
Member
 
Join Date: Oct 2011
Location: Thessaloniki, Greece
Posts: 75
Rep Power: 11
crevoise is on a distinguished road
Hello
Thanks for your 2 answers.
I am indeed thinking as you do, that what am describing is exactly what a co-simulation should do, and especially from the line your took from the user manual.
So far, I have trouble to make it work, so as you suggested, I will contact the tech support. I was asking on the forum, in case someone had some info on that.

In the same time, I went to the Steve Portal - Bright Idea, and found some comment such as:
""This may also be feasible once fluid-fluid co-simulation is made available"" which somehow means that a co-simulation fluid-fluid is not yet available.

I will keep updates once I find out the final answer on this point.
crevoise is offline   Reply With Quote

Old   April 14, 2015, 05:30
Default fluid-fluid co-simulation
  #4
New Member
 
Konstantin
Join Date: Sep 2014
Location: Moscow
Posts: 1
Rep Power: 0
km.sergeenko is on a distinguished road
Hi everyone,
I managed to do a fluid-fluid co-simulation in a simple region (pipe). Maybe it would be interesting for smb.
There were 3 regions: Inlet,middle,outlet.
Each region had 3 boundaries: velocity Inlet, non-slip wall, pressure-outlet.
It was two loops (velocity and pressure) and several steps.
Velocity loop (transfers the velocity from inlet region to outlet region):
First step solved only first region. Data of velocity profile on outlet boundary was written into a table.
Second step solved only middle region. Data of velocity profile on inlet boundary was observed from table of first step. Data of velocity profile on outlet boundary was written into a table.
Third step solved only outlet region. Data of velocity profile on inlet boundary was observed from table of second step. Data of pressure profile on inlet boundary were written into a table.
Pressure loop (transfers the pressure from outlet region to inlet region):
4st step solved only middle region. Data on pressure-outlet boundary was observed from the table of step 3. Data of pressure profile on inlet boundary were written into a table.
5 step solved only inlet region. Data on pressure-outlet boundary was observed from the table of step 4.
These two loops sholud be done for a several times.
In my simulation it was enough of 3 full loops to get the convergence. I compared the results with non-coupling region and it wasn't any differences.

There is two problems on in this algoritm:
1) It's impossible to transfer the gradients on the co-boundary.
2) If area doesn't propose a parallel flow, this algoritm should be done step by step (without a parallel solution of regions).
crevoise likes this.
km.sergeenko is offline   Reply With Quote

Reply

Tags
co-simulation

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
Help with slug flow simulation. Kes FLUENT 3 November 9, 2019 21:39
Review: Reversed flow CRT FLUENT 1 May 7, 2018 05:36
problems in synthetic jet flow simulation jackxu FLUENT 0 December 2, 2012 09:12
Problem, solidworks flow simulation castaway FloEFD, FloWorks & FloTHERM 3 September 11, 2012 12:44
Expert parameter to stop the fluid flow simulation KK CFX 1 February 25, 2008 16:29


All times are GMT -4. The time now is 18:31.