chtMultiRegionFoam: fluid-fluid interface
I am trying to use the different tutorial that deals with the chtMultiRegionFoam solver, but I can not find what I am looking for.
I see hot to treat the fluid-solid interface between region, but I can not understand how to treat the solid-solid and the fluid-fluid interface.
Which are the right BC on epsilon, k, U, p, p_rgh, T and so on on these interfaces?
Thanks for help,
I will attempt to answer your question, not because I am sure about the answer but rather to see if I have it right in my mind.
In the chtMultiRegionFoam/multiRegionHeater we can see that all interfaces of the heater with the rest of the parts have the same BC for the temperature:
As for the fluid-fluid: why do you have an interface in the first place? Can't you join these two parts? if you can't, you might need significant modifications in the solver.
thanks for answering.
Actually, as far as the solid-solid interface is concerned, you're right. It's enough to use the same BC that are used in the tutorial.
Also, I have 2 different fluid region because I would like to be able (but I need to modify the solver and I've not been able, yet) to impose the temperature in a certain FLUID volume, which is connected with another fluid volume. Altough I can't run my new solver, yet, I have a mesh with 2 detached fluid regions, with an interface. I thought that a zeroGradient condition was ok, but that's not true.
The simulation, in fact, seems to explode and it's like a source appear on the interface.
Do you think I should `unify the 2 regions'? Can't I deal a domain with to fluid regions detached by an interface?
If it really is just about imposing a different temperature on one of two fluid zones, I suggest using the "setFields" utility. That is much easier than writing a new solver, getting two zones to cooperate easily.
Nevertheless, if you made progress on the fluid-fluid-thingy, I would be happy if you could share your knowledge with me. Because at the moment I am trying to do something very similar. ;-)
of course I will share what I will discover.
And what about the setField? I need to impose temertature, but I need that it remains constant during the whole simulation. I was thinking about explicitSetValue (but it's not implemented in the multi regions solver). That's why I was editing the source.
Can I solve this with the setFields option?
Also, what about writing via email (firstname.lastname@example.org)? That would be much easier and we could post something useful if we reach our goal.
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