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Waves and a floating body... in CFX?

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Old   January 9, 2011, 21:52
Default Waves and a floating body... in CFX?
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Hi, I'm relatively new to CFD, so please bear w/ me...

I want to look at the effectiveness of a breakwater on decreasing the sea state in open water, but the breakwater is a floating at the air/water interface due to it's own buoyancy.

Are you able to have a floating body in CFX? The minimal work I've done was where the object is in the flow field (airfoils, etc.).

I've done the 'flow over a bump' tutorial and gotten wave action by varying the speed over the bump, but not sure if this is the most effective way to 'induce' waves. Am I even using the right software (CFX)?

Thanks in advance to any help!

Last edited by salvooch; January 10, 2011 at 16:19.
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Old   January 10, 2011, 17:33
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This is best done in CFX V13 using immersed solids and the 6 DOF solver.
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Old   January 12, 2011, 18:30
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I'll do the immersed solids tutorial (buoy) an see if I the output is useable for what I want to look at. Thanks, and I welcome any additional information!
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Old   January 13, 2011, 02:36
Default Tutorial done...
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Ok, after running the tutorial, looks like what I need. That said, does anyone know how to induce different sea states? or create a wave pool?

Meaning, anyone already run code to induce sea state 2, 3, etc., or know what type of movement of the boundaries has to be done in order to induce waves of a specific period (like a wave pool or test tank would have)?

Thanks
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Old   January 13, 2011, 17:54
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Do a search on the forum for modelling ocean waves. There was a post on it some time ago which defined a good model for ocean waves.
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Old   January 13, 2011, 22:48
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Thanks, I'll do a search tonight
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Old   January 14, 2011, 06:04
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Sounds like Orcaflex could be suitable software to me.
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Old   January 15, 2011, 07:45
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Or ANSYS AQUA. This will be a tricky model to get accurate in any CFD code.
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Old   January 19, 2011, 18:53
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Thanks. For now (at least), I'm going to try the 6 DOF/immersed body method (tutorial 32).

For some reason, my university's Workbench doesn't have the hydro module available to tie into AQWA, yet we have AQWA available... Either way, I can't seem to get it to launch AQWA, and am in the process of asking IT and various CFD profs for help w/ it.
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Old   January 20, 2011, 05:03
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I don't know if this will be of any help, but Stephen Salter at Edinburgh university has done a lot of research on wave making. His papers might save you some time getting the type of waves that you want.
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