# Free surface is not falling (VOF MODEL, TANK DRAINAGE)

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 February 25, 2013, 14:25 Free surface is not falling (VOF MODEL, TANK DRAINAGE) #1 New Member   Join Date: Jul 2012 Location: India Posts: 18 Rep Power: 6 Hi, I am modeling a tank drainage on VOF model of Fluent. Tank has a simple rectangular shape having one inlet at the top and three outlets at bottom. Tank's lower volume is filled with water (using adapt region) and upper volume by air. Simulation Parameters: Inlet: Velocity inlet Outlets: Pressure outlet Incoming Fluid through inlet is water. Explicit scheme, CFL=2.0, Geo-reconstruct, Variable Time iteration Inlet area is large than the sum of three outlets. My problem: (a) When I put X m/s velocity at inlet BC, all three outlets shows about same outlet velocity. Is it correct? (b) There is no change in free surface level of water in the tank. I have checked REPORT FLUXES of inlet and all outlets, inlet flux=outlets fluxes. why free surface is not falling or rising? I have changed inlet velocity but there is no change in free surface and incoming & out going fluxes remains constant. In practical phenomenon free surface should fall. Image attached Please help me. Thanks Last edited by Blue; February 25, 2013 at 14:34. Reason: image

 February 26, 2013, 05:40 #2 New Member   Join Date: Jul 2012 Location: India Posts: 18 Rep Power: 6 Please any one reply

 July 4, 2013, 09:41 Volume of fraction #3 New Member   yes Join Date: Jul 2013 Posts: 7 Rep Power: 5 hi, I want to modelling reactor through volume of fraction please help how to make geometry and export this to fluent .Please guide me. Thankyou.

 November 28, 2013, 06:51 Same problem #4 New Member   ASHRAF ALFANDI Join Date: Oct 2012 Posts: 17 Rep Power: 5 Hi, I am trying to simulate water draining from at a tank at 10 meter elevation through a pipe. I am using ANSYS FLUENT to do that. I am using VOF for modelling. I am having difficulties in defining the inlet and outlet boundary condition. Right now, I am using pressure-inlet and pressure-outlet for inlet and outlet boundary conditions, but after running the code, it shows a lot of secondary flow within the tank and pipe. anyone have an idea about that?

 Tags fluent, tank drain, tank emptying, tank filling, vof model

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