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Old   June 11, 2014, 19:00
Question Solid object falling in water tank simulation
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Hello fellow CFD experts,
I need your help setting up this simulation in CFX. From the physical standpoint, the scenario is somewhat straight forward. The scenario goes as follows:
A stationary tank with water (like a glass of water) is subject to a solid object moving through (translation domain for the solid) from the top surface of the water to the bottom of the tank. After the solid is pushed to the bottom of the tank, it is left to interact with the fluid (and assuming its density is less than the liquid) one shall see the solid float to the surface.
The goal of the simulation is to visualize the transient fluid velocity profiles created as a result of the moving object. Ideally, I would like to estimate how long it takes for the water to get back to zero velocity (equilibrium) after one cycle (pushing the solid to the bottom of the tank and letting go of it and reach the surface).
This is obviously a transient simulation, with several domains (stationary and moving). Also, buoyancy would have to be enabled.
Any suggestions as to how to approach this setup would be greatly appreciated. After the simulation is setup, the ultimate goal is to optimize the shape of the solid object in order to "maximize" the time it takes for the water to get back to zero velocity.

Last edited by cassini83; June 11, 2014 at 22:18.
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buoyancy, tank

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