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October 2, 2007, 02:43 |
rotating bucket problem
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#1 |
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I am trying to validate a free surface modeling code (in CFX 11) for a rotating bucket problem.
I have taken the dia of the cylindrical bucket to be 5 cm and the total height is 10 cm. I have taken the height of water in the bucket at 7 cm. I have different values of rotation speeds at 1 rev/min and 10 rev/min. I ran the simulation as follows.Homogenous model for multiphase flow.for heat transfer model,i gave Isothermal(25 C).For interpahse transfer I used Mixture model. If I do not consider buoyancy the simulations converge,but if i do,they do not. I am not sure if the converged results are physically acceptable,becoz even at small speeds the free surface vertex is near the bottom of the vessel. I am alos not sure if buoyancy can be so conviniently neglected in free surface flows.!! SOme tips in this regard will be appreciated.. Thanks a ton,in advance, Brown.. |
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