Learning Forum

[Chinmaya Kumar Patra]

I am trying to do a two-phase boiling simulation in fluent in a rectangular channel including conjugate heat transfer analysis.. I have given constant heat flux BC at  the bottom wall and the rest walls are given zero heat flux (adiabatic). Should I mention the wall thickness for all walls in BC setup of fluent for simulating the model or the wall thickness should be kept at 0 (default setting) for conjugate heat transfer analysis? I have attached the screenshot of the wall and fluid with BCs.

[DrAmine]

If you are not resolving the walls then you can provide a thickness for the walls to model the steady heat conduction through the solids but only in the normal direciton of the walls. Tangetial / transversal heat conduction in not captured by this approach.

[Chinmaya Kumar Patra]

I have resolved the wall kindly find the mesh for the computational domain in the screenshot attached and suggest whether to give wall thickness for all walls or some specific walls. I am doing flow boiling simulation in the channel.

 

[DrAmine]

You do not need to provide any thickness for the walls in Fluent as they are now resolved and modeled as solid domain!

[DrAmine]

Fluid Mesh should be much more finer but I recommend to use log-wall type of mesh for stability reasons when using one of Boiling Models (and you are running turbulent).

[Chinmaya Kumar Patra]

I am not using turbulent model as my complete flow domain is laminar. I will refine the mesh for fluid but what is long-wall type of mesh?