3D Annulus Cylinders
 

Hi all of you

I'm working on concentric and eccentric annulus using nanofluids.

My issue is with laminar flow (Re = 100-1500) and specify the gravity the solution did not converge. without applying the gravity had good convergence and the heat transfer coefficient as follows

h = 28 without gravity
h = 30 with gravity


How to deal with this issue as I have to study the buoyancy force???

You might have some luck with different Pressure-Velocity coupling or pressure discretizations, particularly Body-Force-Weighted.