Reply To: Volume Fraction too Low. How to Improve?

[abdullahhassan]

Hi Rob, 

I am expecting atleast 60% of liquid VF in simulation. it is a simple setup and next step is to simulate condensation over multiple tubes. 

Regarding choice of VOF model, majority of papers have used VOF to simulate condensation that's the reason i am using.

By thermal wall boundary condition, did you mean coupled wall or using heat flux? this is the condition i have applied.

Also at cell zone>tubewall>fixed terms > 273.15K. just to make sure the tube pipe will remain subcooled for condensation.

let me also share the mesh of this geometry, as i am also not confident on the mesh too. 

for the volumetric mesh, min size = 0.3mm, max size is 9.6mm , inflation layers 25 with first layer at 0.005mm and growth of 1.1. orthognal quality of 0.2.