[sameedakber]

Hi all. I'm simulating heat transfer for an open channel flow over multiple cylindrical bodies. All thermophysical properties are constant. Water enters inlet at 38 C. Initial temperature is 22C so there is some temp gradient in the domain. There is a zero gradient temperature BC on side walls (including cylinder walls).

I'm a bit confused about which of the two solvers should be used in this case. Since I'm taking density to be constant, there should be no buoyant forces. However, I'm getting different results from the two solvers. I've also included temperature profiles over time in close vicinity of one of the cylinder which shows this difference.

I would appreciate any help.