Use of multiple domains simulations in CFD?

Hello everyone,

Currently doing the T-Flows crash course (available for free in the classroom section), I really recommend it for those who are starting their learning journey in CFD, it will introduce to a variety of important CFD topics.

And now I am in the session where we work on a multi domain simulation as we work on a conjugate heat transfer parallel plate benchmark problem where the plate in the top is a gas, the one in the middle is a solid, and the one in the bottom is also a gas. And basically in this problem, we view how the heat is transferred from one gas to the solid plate to the other gas.

And this case made me curious about when should we have the geometry for our cfd cases divided into multiple domains. I tried to Google it and search on YouTube but couldn't find anything. But my guess is that multi domain simulation come in handy when:

1.we are working with multiple fluids or multiphase flows.

2.fluids interacting with solids

It would be helpful if somebody can inform me on this topic or refer me to some resources.

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