What Is the Overflow Boundary Condition in Fluent?

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The "overflow" boundary condition in Fluent is not well-documented, leading to confusion among users. There are vague references online, but no clear explanations or guidelines are available in the help files or academic journals. It is speculated that this condition may relate to liquid-only outflow at a free surface. Users seeking clarity on its purpose and applications find themselves without adequate resources. The lack of information suggests a need for further exploration or clarification from Fluent's support.
Topher925
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Apparently Fluent has this thing called an "overflow" boundary condition. I tried searching the help files and found absolutely nothing about it. Does anyone know what this is and why someone would want to use it?
 
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Hmmm, google turned up nothing except a few vague references to using an OVERFLOW boundary conditions (note that all references I found used an all-caps notation). Even a journal search turned up nothing.

Perhaps it has to do with actual overflow. That is, it can be a "liquid-only" outflow boundary condition at a free surface?

Other than that guess, I haven't a clue; I've never heard of it.
 

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