Learning Forum

[nhatey]

Hello! I am trying to model a simple box with 2 inlets and 1 outlet. The fluid is air. The system is driven by the one outlet pushing air OUT of the system, and the 2 inlets pulling air in from the atmosphere. I am analyzing the system under transient conditions.

How would I go about modeling the boundary conditions for this?

I currently have the outlet as "mass-flow-outlet" and the 2 inlets as "inlet-vent". Multiple phases are turned off. Dynamic mesh with implicit updates are turned on.

I keep getting the point float error although my model has good enough skewness and orthogonal quality. Am I having a mesh issue? Or is it an issue with initial conditions?

[Rob]

I'd use a velocity boundary with a negative component/value and two pressure inlets. Vent is intended for something else (read the User's Guide) as I can't remember the definitions.
Floating point could be mesh or boundary condition related. Just because the cells are good doesn't mean the mesh is: you may not have resolved the flow features sufficiently.