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Modelling a Simple Draining Funnel

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Old   July 3, 2002, 15:15
Default Modelling a Simple Draining Funnel
Rupp Carriveau
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I wondered if anyone new a "simple" procedure for modeling water draining through a funnel. I would like it to be an unsteady problem where the water surface moves as it would under gravity (draining without replenishment). I am unsure if I have to specify all the boundaries as moving, and if I do, am I responsible for dictating the rate?


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Old   July 3, 2002, 23:57
Default Re: Modelling a Simple Draining Funnel
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For simple: check Bird, Stewart and Lightfoot, "Transport Phenomena", and Munson et al, "Fluid Mechanics"

For complex: use a free-surface model like the VOF model in FLUENT. You'll have two phases: gas and liquid (water). Since the gas will be entering from the top of the funnel as the liquid level recedes, you need to specify the pressure at the boundary = Patm. This method will be able to predict (through the correct inputs) vortex formation in the liquid surface.

For more complex: use a moving mesh model. Here you prescribe the motion of the liquid surface through a complex user-defined function on the basis on the analytical solutions provided in the simple approach above
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Old   July 4, 2002, 09:00
Default Re: Modelling a Simple Draining Funnel
Rupp Carriveau
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Thanks for the great tips! I am anxious to give them a go!

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