[Anil15ume085]

Hello everyone,
I am new in ANSYS FLUENT (CFD simulation)
I want to simulate pool boiling in 3d.
Here is my geometry. I have set up the tube material and wall as steel.

I ran the simulation for 2D and 3d. In the case of 2d, I am getting bubbles, but the same is not happening in the case of 3D. Even if I am applying the same parameter for 3d I am not getting bubbles.

The results for both 2d and 3d in am attaching below.

I am using the following models
(1)K-epsilon, SST, Vicous heating
(2)No of time steps=2000
(3)Time step size=0.0001
(4)max iteration per time step=40

I am using the following solution method
(1)Scheme=Piso
(2)Gradient=Least square cell-based
(3)Pressure=Presto
(4)Volume fraction=Geo-Reconstruct