[Naaren]

Dear Community,

I am working on simulation of boiling heat transfer. The two phases (Liquid and Vapor) are tracked using a level set method. At the top of the domain, I am using an outflow boundary condition [setting the reference pressure as 0 and gradient of other quantities (u, v, w, T) to be 0]. With this boundary condition, I can observe a reverse flow of liquid at the top of the boundary when the vapor leaves the domain.

I would like to know if this is normal or I should match the volume flow rate of vapor going out and liquid coming in. I wish to kniw if there any better way to treat an outflow boundary in case of two phase simulations.

Thank you,

[fasgya30]

Hahaha I actually develop for CFX (although I work on TurboGrid, not the solver side). Changing state is very difficult to model because you don't actually model the cause-and-effect (conservation of energy is VERY hard to converge) instead we developed models for the 'macro' processes. They are only valid within certain ranges of conditions, and even then the convergence is limited.
pikashow
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