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FSI modeling of a surface effect ship!!!

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Old   January 4, 2010, 05:06
Default FSI modeling of a surface effect ship!!!
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smn
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hi:
i have done alot of fsi problems such as blood vessles and piping systems.Now i want to model a ship on water using fsi and analyze the effects of water on the ship and its movements...can anyone help me and introduce a similar tutarial?
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Old   January 6, 2010, 15:34
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Unless you are interested in hull stresses, I would not use 2-way FSI for this. Instead use the 6-DOF rigid body solver in version 12.0 or later (beta feature).
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Old   January 6, 2010, 16:59
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Hi,
Such CFD problems can be modeled in CFX by using features as Two fluids, Free surface, Mesh motion and Mesh adaptation, it seems to be a very complicate simulation but it is interesting.
In CFX Tutorial you can find two tutorials which help you to do this simulation:
1- Tutorial 7: Free Surface Flow Over a Bump;
2- Tutorial 20: Fluid Structure Interaction and Mesh Deformation.
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Old   January 11, 2010, 07:10
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Quote:
Originally Posted by stumpy View Post
Unless you are interested in hull stresses, I would not use 2-way FSI for this. Instead use the 6-DOF rigid body solver in version 12.0 or later (beta feature).
thank for your reply,would you please explain more,regards
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Old   January 11, 2010, 15:03
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If you turn on beta features in CFX-Pre v12 you'll find you can add a rigid body object to the simulation. CFX will calculate the motion of the hull due to the fluid forces, treating it as a rigid body. The mesh motion at the hull wall boundary can use the "from rigid body solution" option. I'm sure CFX tech support would have examples they can send. This is by far the easiest way to simulate hulls, as long as the deformation of the hull can be neglected (which implies no stresses are calculated).
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Old   January 12, 2010, 07:07
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Quote:
Originally Posted by stumpy View Post
If you turn on beta features in CFX-Pre v12 you'll find you can add a rigid body object to the simulation. CFX will calculate the motion of the hull due to the fluid forces, treating it as a rigid body. The mesh motion at the hull wall boundary can use the "from rigid body solution" option. I'm sure CFX tech support would have examples they can send. This is by far the easiest way to simulate hulls, as long as the deformation of the hull can be neglected (which implies no stresses are calculated).
Is it also possible in ver11?
would you please introduce a solved example or tutorial?
thanks
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Old   January 12, 2010, 18:05
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This stuff was vastly improved in V12. Don't even bother trying to do it in V11.
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Old   January 17, 2010, 07:02
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This stuff was vastly improved in V12. Don't even bother trying to do it in V11.
thhanks for your reply,would you please introduce tutorial or examples about that?
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Old   January 17, 2010, 17:15
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V12 comes with a number of tutorial examples in this area, and the CFX support have a lot more available on request. Talk to your CFX support person to get the examples.
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Old   January 26, 2010, 03:33
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V12 comes with a number of tutorial examples in this area, and the CFX support have a lot more available on request. Talk to your CFX support person to get the examples.
i cant get the helps of cfx supports...would you please tell me which options if v12 i should use? i mean for example explicit dynamic or others?
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Old   January 26, 2010, 17:26
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Have a look on the ANSYS CFX website and it will show you the cool new stuff you can do with the rigid body solver. It also has lots of upgrades on FSI if that is of interest too.

But seriously, you are kidding yourself doing this type of work without support. If you are a student then talk to your supervisor about research licenses. If you have a pirate version, well.... D'oh!
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