# hull resistance need help

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 March 14, 2006, 17:43 hull resistance need help #1 hakan ozdemir Guest   Posts: n/a hull resistance I am trying to set up a problem in fluent. I want mesh a ship in gambit. I want to use multiphase model. Would you please help me. This is my turn project and I need a detailed help as a university student. I would appreciate if you help me. Thanks for advance. Regards Hakan

 March 15, 2006, 03:51 Re: hull resistance need help #2 Ahmed Guest   Posts: n/a Let us assume you can export your geometry as IGES or STEP file, import that file in GAMBIT, roll up your sleevs and form one volume form the imported faces. Construct a big brick around that ship, subtract the two using boolean operations, and pay attention not to keep the ship volume. Mesh the resulting volume, enjoy your project.

 March 23, 2006, 04:37 Re: hull resistance need help #4 Nando Guest   Posts: n/a I see there are many people interested to hull resistance. I want to post you, Ahmed, a problem I can't solve. I did many analysis on a tanker hull, I choose the 1:1 scale and VOF model. In this way, the convergence is more difficult, because I have Re = 10E7 instead 10E5, and you have to pay attention to mesg quality, discretization order and turbulence models. However, the results are very good, compare to tanks data. My objective was also to capture the wake at propeller plane, for this I choose a 1:1 scale, to avoid unknown scale effects. In all my analysis w (Taylor notation) is 0.20-0.23, the expected value is 0.29-0.32. This means, velocity inflow at propeller is greater then expected. I tried k-w SST, k-e Realizable, different type of mesh... I have always a lower w. Yes, there are a separation zone behind hull, but it is well predicted. From other parameters, i suspect my model is very good for "global" values (overall lift and drag, wave pattern..) but not so for "local" variables, like velocity in a little surface behind hull. Have you any experiences or suggestion about? Thanks and regards Nando

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