I'm new to SW Simulation and am trying to model a hot water vessel to determine heat loss. The trouble is that I appear to get wildly different results when playing about, these range from unrealistically low to high and I therefore don't trust the results.
It's a simple model as far as I'm concerned - I've created a block of PIR insulation and extruded a cavity inside, then placed a water volume inside it. I then assigned a temperature to the water volume surface (45 degrees C) and a convection coefficient of 7.7 W/m2K to all external surfaces of the insulation. Clearly, I've ignored the metal cylinder itself.
Any thoughts on why results seem to fluctuate? I've used a curvature based mesh on the finest setting