CompressibleInterDyMFoam with 6DOF body

im_lenny · January 27, 2017, 15:55

I'm trying to determine how to best simulate a large object hanging by a cable under water. The goal is to prescribe the motion of the top of the cable and simulate the motion of the large object as it moves through the water. The motion of the object will be large compared to the domain (20% of the length), so I worry about the mesh. Is it possible to set up a case that occasionally re-meshes as time goes on, or will the dynamic mesh be able to handle it.

My object is a complicated .stl. I normally use snappyhexmesh to generate 3D volume mesh with about 10 million cells. Is it possible to use snappy or do I need to switch to overset grids?

Can I prescribe the motion of the upper end of the cable? Maybe making the cable a very stiff spring and moving the upper end is an option?

I am running OpenFoam version 3.0, but I am willing to upgrade to version 4.1.

Regards,
Lenny

r.taheri · July 17, 2017, 10:15

hi dear
My model is a body floating in water that with flexible cables anchored.
Can OpenFoam software do the modeling of flexible cables and their transformations?
help me please

im_lenny · July 17, 2017, 10:33

OpenFOAM does not model cables.

gsg001 · July 19, 2017, 05:26

Hi Leonard and Reza,

Waves2foam has added the ability to model mooring lines 3 months ago.

https://github.com/ogoe/waves2Foam/t...es2FoamMooring

r.taheri · July 19, 2017, 09:40

hi sir
thank you for this gaide.
good luck

January 27, 2017, 15:55	CompressibleInterDyMFoam with 6DOF body	#1
im_lenny New Member Leonard Cassady Join Date: Aug 2015 Posts: 14 Rep Power: 11	I'm trying to determine how to best simulate a large object hanging by a cable under water. The goal is to prescribe the motion of the top of the cable and simulate the motion of the large object as it moves through the water. The motion of the object will be large compared to the domain (20% of the length), so I worry about the mesh. Is it possible to set up a case that occasionally re-meshes as time goes on, or will the dynamic mesh be able to handle it. My object is a complicated .stl. I normally use snappyhexmesh to generate 3D volume mesh with about 10 million cells. Is it possible to use snappy or do I need to switch to overset grids? Can I prescribe the motion of the upper end of the cable? Maybe making the cable a very stiff spring and moving the upper end is an option? I am running OpenFoam version 3.0, but I am willing to upgrade to version 4.1. Regards, Lenny Last edited by im_lenny; January 30, 2017 at 12:32.

July 17, 2017, 10:15	flexible cable	#2
r.taheri New Member rezataheri Join Date: Jul 2017 Posts: 3 Rep Power: 9	hi dear My model is a body floating in water that with flexible cables anchored. Can OpenFoam software do the modeling of flexible cables and their transformations? help me please

July 19, 2017, 05:26	Mooring Line	#4
gsg001 New Member G Grewal Join Date: Aug 2010 Posts: 6 Rep Power: 16	Hi Leonard and Reza, Waves2foam has added the ability to model mooring lines 3 months ago. https://github.com/ogoe/waves2Foam/t...es2FoamMooring Last edited by gsg001; July 19, 2017 at 05:27. Reason: Spelling

July 19, 2017, 09:40	appreciation	#5
r.taheri New Member rezataheri Join Date: Jul 2017 Posts: 3 Rep Power: 9	hi sir thank you for this gaide. good luck

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July 17, 2017, 10:33		#3
im_lenny New Member Leonard Cassady Join Date: Aug 2015 Posts: 14 Rep Power: 11	OpenFOAM does not model cables.