Hello @rtaheri ! I had presented a project link with you in one of our previous discussions. You can use the model there as a reference, because it’s possible to create a flow region inside that model.
There are no gaps in my geometry. I tried creating an internal flow volume but it fails because my seed face and boundary faces have an infinite flow.
Infinite flow region error actually means that there are openings or gaps in your model that were not specified as boundary faces. You can try uniting all your bodies to make sure which parts are causing any issues in generating the flow region.
Conjugate Heat Transfer IBM simulation type is relatively a new solver compared to the standard Conjugate Heat Transfer simulation. All features that we have in CHT will eventually be available in IBM simulations as well.
In case the issue persists, please feel free share a URL to your project making sure that it’s shared with support. I can have a quick look into the problem.
Thanks,
Kaan