FLUENT - VOF to model draining tank, swirling liquid, vortex at the drain
drain.
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It is possible to model a draining tank filled with a swirling liquid, and to capture the vortex that forms at the drain. The goal was to pinpoint the time at which the first gas reaches the drain. A pressure inlet was used to maintain the tank pressure (otherwise the assumption of incompressibility in FLUENT is violated, and one gets pockets of gas in the liquid). A Custom Field Function was used to set up an initial swirl velocity. The drain was treated in a counter-intuitive manner: a velocity inlet was used as the boundary condition, with the direction vector pointing out of the tank, and with the volume fraction of liquid equal to unity. |
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