sounds like your model needs a check
here is a good start SolidWorks Quick Tip - 4 Things to Do Before Every Flow Simulation Analysis
i would also recommend starting simpler. start with just the room. then add some components...etc
This will also help you identify which components are causing you issues
Thank you Jared, really appreciated your reply,
Suppose we have 10 identical component (let's say humans) inside the model. And all of them as a heat source are generating 120W (Surface source). While defining boundary conditions, Can I select all of them together at once? (If yes, should it be 120 W or 120*10W). Or do I have to define boundary conditions (120W) separately one by one. My problem is basically like that, When I defined combinedly (only 120W), the simulation runs but I find surface temperature very low and then I defined all of them one by one and it just doesn't iterate.
Above mentioned is just an example, I have several identical component as heat source inside model and defining boundary condition one by one is very time consuming.
flow simulation considers the value total
it is divided among all the entities relative to their % volume
so you need to put in 120*10 if they are 10 each
this should not affect the "prepare modeling" issue