MultiRegions: How are neighbouring domains coupled?

Ivooo · January 8, 2013, 11:05

Hi,

I'm working on an extension of EHDFoam (the one found on the wiki). So far I achieved quite good results for the multiphase fluid simulations. I now want to include a solid phase in these simulations, so I need to have multiple regions solved separately.

The chtMultiRegionFoam program has been a good example so far. I removed the parts about heat transfer, changed everything so that it basically solves 'interFoam' in the fluid part, and set up the electric field equations. I'm now designing a test-case, where I need to couple the electric potential (scalar field) via a shared boundary patch. The question is, is this done automatically by using the same variable name? Or do I need to impose the boundary conditions (BC) for each region explicitly in the code, or perhaps via an additional, specialized library? For the chtMultiRegionFoam I found the coupling occurs via a BC called 'type compressible::turbulentTemperatureCoupledBaffleMix ed;'. Frankly, the code of this particular BC library seems quite elaborate for 'just' passing on the right value+gradient for the temperature from one domain to the other. It also seems much more 'low-level' programming than the actual solver. Therefore I wondered if there would be a more straightforward way of coupling the two (or more) regions.

TL;DR: When using the multi-region framework provided by OpenFOAM, do I always need a separate library to couple the boundaries of two adjacent domains?

styleworker · September 11, 2013, 06:19

I'm interested in combing chtMultiRegionFoam with interFoam. Did you make any progress?

logo · May 24, 2016, 08:58

Hi styleworker and Ivooo,

I am facing a similar problem with you. I want to create a coupling BC for the interface between the solid and fluid domain. More specific I am looking for an electric field coupling condition..
As this is an old thread, can you suggest me o solution .?

January 8, 2013, 11:05	MultiRegions: How are neighbouring domains coupled?	#1
Ivooo New Member Ivo Join Date: Feb 2012 Posts: 26 Rep Power: 14	Hi, I'm working on an extension of EHDFoam (the one found on the wiki). So far I achieved quite good results for the multiphase fluid simulations. I now want to include a solid phase in these simulations, so I need to have multiple regions solved separately. The chtMultiRegionFoam program has been a good example so far. I removed the parts about heat transfer, changed everything so that it basically solves 'interFoam' in the fluid part, and set up the electric field equations. I'm now designing a test-case, where I need to couple the electric potential (scalar field) via a shared boundary patch. The question is, is this done automatically by using the same variable name? Or do I need to impose the boundary conditions (BC) for each region explicitly in the code, or perhaps via an additional, specialized library? For the chtMultiRegionFoam I found the coupling occurs via a BC called 'type compressible::turbulentTemperatureCoupledBaffleMix ed;'. Frankly, the code of this particular BC library seems quite elaborate for 'just' passing on the right value+gradient for the temperature from one domain to the other. It also seems much more 'low-level' programming than the actual solver. Therefore I wondered if there would be a more straightforward way of coupling the two (or more) regions. TL;DR: When using the multi-region framework provided by OpenFOAM, do I always need a separate library to couple the boundaries of two adjacent domains?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[ANSYS Meshing] Displaying solid domains in CFD Post without meshing them.	hda	ANSYS Meshing & Geometry	5	October 24, 2016 09:26
Coupled domains with two different fluids	General_Gee	OpenFOAM Running, Solving & CFD	3	October 11, 2010 12:51
Examples of implicitly coupled domains	nadine	OpenFOAM Running, Solving & CFD	3	August 15, 2008 18:53
Multiple Solid Domains - Interfaces	Scott	CFX	8	July 31, 2008 15:20
Coupled 1D/3D STAR-CD Training	CD adapco Group Marketing	Siemens	1	November 13, 2002 15:48

September 11, 2013, 06:19		#2
styleworker Member Join Date: May 2012 Posts: 55 Rep Power: 14	I'm interested in combing chtMultiRegionFoam with interFoam. Did you make any progress?

May 24, 2016, 08:58		#3
logo New Member dklogo Join Date: May 2015 Posts: 11 Rep Power: 10	Hi styleworker and Ivooo, I am facing a similar problem with you. I want to create a coupling BC for the interface between the solid and fluid domain. More specific I am looking for an electric field coupling condition.. As this is an old thread, can you suggest me o solution .?