Hi,

I'm trying to do a flow simulation on a closed loop system. Until now, I had worked with open systems to get used with flow simulations.

For this simulation, the inputs are what in an open system would be the outputs: outputs and inputs are the same. I guess that I should define some initial conditions of the fluid (temperature, mass flow,...), but I don't know how to define that given that for this problem I don't have "Lids" as I use to have.

I'll start with a simulation without gravity, and once I know how to do this simulations I'll include gravity and apply a difference of pressure between A and B (see picture)

There is a picture for doing this question more understandable:

I don't have a lot of experience with this type of simulation, but I would start with setting wall boundary conditions on the inner surfaces of your fluid container. You can define temperate, heat exchange coefficients, etc... You will probably need to slice your model up into seperate solid bodies in order to isolate sections of your inner walls.