FSI modeling of a surface effect ship!!!

smn · January 4, 2010, 05:06

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?
regards

stumpy · January 6, 2010, 15:34

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).

Abou ali · January 6, 2010, 16:59

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.

smn · January 11, 2010, 07:10

Quote:

Originally Posted by stumpy

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

stumpy · January 11, 2010, 15:03

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).

smn · January 12, 2010, 07:07

Quote:

Originally Posted by stumpy

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

ghorrocks · January 12, 2010, 18:05

This stuff was vastly improved in V12. Don't even bother trying to do it in V11.

smn · January 17, 2010, 07:02

Quote:

Originally Posted by ghorrocks

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?

ghorrocks · January 17, 2010, 17:15

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.

smn · January 26, 2010, 03:33

Quote:

Originally Posted by ghorrocks

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?
regards

ghorrocks · January 26, 2010, 17:26

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!

January 4, 2010, 05:06	FSI modeling of a surface effect ship!!!	#1
smn Member Join Date: Jun 2009 Posts: 56 Rep Power: 17	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? regards

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January 6, 2010, 15:34		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	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).

January 6, 2010, 16:59		#3
Abou ali Member Join Date: Nov 2009 Posts: 49 Rep Power: 17	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.

January 11, 2010, 15:03		#5
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	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).

January 12, 2010, 18:05		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	This stuff was vastly improved in V12. Don't even bother trying to do it in V11.

January 17, 2010, 17:15		#9
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	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.

January 26, 2010, 17:26		#11
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	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!