I'm using FloWorks from within SolidWorks 2008. That could be my first problem. Here's what I have going on:
A plate with fins on one side (the outside) and heat generators (132W total) mounted on the other side (the inside). A thin metal cover goes over the heat generators, enclosing that side of the plate, but a rubber gasket seals the juncture between the plate and the cover. I am running an external analysis but not excluding internal spaces because I care about the heat conducted from the heat generators through the air and out the cover. There will be air flow but I ran it without any at first and things seems to be getting exorbitantly hot when I expected more heat to be conducted away by natural convection. Then I assigned an initial air flow condition and ended up with negative temperatures well below the ambient temp of 20C, which seems completely wrong. Has anyone else ever had this experience? I am currently in the process of testing out an even more simple model to try to wrap my head around what FloWorks is doing.
Any input is welcome. Thanks!
UPDATE: I added files for a very simplified version of the problem. The other model was impractical to troubleshoot because it would take some 9 hours to run... which means I should probably adjust the mesh settings right? Anyway, this one lacks a rubber gasket but I'm not too worried about it. I noticed that it's the min fluid temperature that is dropping below ambient and not the min solid temp. This is a little less disconcerting but still doesn't make sense to me. I have ambient set to 20C and the min fluid temp comes out to be about 14C. How is this possible?