I'm not very knowledgeable about Simulation or Flow, but I think you are correct. Thermal Simulation is normally used to figure out what happens to the solids, assuming any fluids around them are at a certain temperature. I think you need to use Flow if you want to find out what happens to the temperature of a fluid when a solid at a certain temperature is immersed in it.
Hi Francisco: Jerry is correct. You can calculate ambient temperatures (in surrounding fluid of gas or liquid) using "SolidWorks Flow Simulation". I believe it now retails for about $15k. You can set this discussion to "answered". Thank you.