FSI and 6DOF

Marcelo · March 24, 2009, 22:37

Dear All,

I have 2 questions

I need to know if star ccm+ works with ABAQUS in a FSI simulation

and

I need to model a free fall with 6dof (i am using a trial licence) could anybody help me with this? The institution could buy the software for me if I show a simple model

Regards
Marcelo
Chile

ping · April 16, 2009, 05:51

1. With STAR-CCM+ I read that you can both import and export surface data with abaqus, so you can do manual coupling of the codes (eg map temperatures from one to the other), and this could be automated to some extend with macros. STAR-CD can do two direct FSI coupling with abaqus so both solvers are running simultaneously.

But do you really need abaqus, since STAR-CCM+ can now solve the stress equations, so many FSI problems are very simple and much more efficiently solved than any other linking/mapping approach.

2. Free fall with 6DOF is very feasible - see an example of a shipping container falling into water here:

http://www.cd-adapco.com/media/videos/6dof/slamming.swf

and how to set up a ship 6DOF model too:

http://www.cd-adapco.com/media/demos.../DFBI_demo.swf

You can ignore the wave model and just set you free surface level somewhere below the object you want to free fall.

panda · April 16, 2009, 20:52

STAR-CCM+ can work together with ABAQUS, but I think the FSI is a one-way approach and thus the two software can only be loosely coulped. Maybe only CFX can do a fully coupled FSI simulation.

nomad · November 24, 2009, 21:20

Does this need region interfacing, or is it just a simple volume mesh? I tried this with a windmill rotor, but can't seem to get any rpm out of it.

ping · November 25, 2009, 00:02

It depends what you mean:
You only require multiple regions when you need different physics or mesh types within each. And then you only need interfacing if you want some connectivity between the regions. If the windmill is rotating (either MRF or rigid body motion) then you need a separate region to applied these conditions to. Can't see any need for 6DOF in this case since the stress solve will calculate the deflections.
If you what to solve stress within STAR-CCM+ then the solid rotor would also be another region and and interfaced to the fluid. Rotor deflection and coupling to the fluid is controlled automaticall for example by selecting the Large Deflection option after the Stress model is selected.
If you really want to couple to abaqus (not really required) you can do two way coupling in the code now by adding a macro to the solve and thus automate the backwards and forwards export and import process.

March 24, 2009, 22:37	FSI and 6DOF	#1
Marcelo New Member Marcelo Join Date: Mar 2009 Location: Valparaiso Chile Posts: 26 Rep Power: 17	Dear All, I have 2 questions I need to know if star ccm+ works with ABAQUS in a FSI simulation and I need to model a free fall with 6dof (i am using a trial licence) could anybody help me with this? The institution could buy the software for me if I show a simple model Regards Marcelo Chile

April 16, 2009, 20:52		#3
panda Member Join Date: Mar 2009 Posts: 35 Rep Power: 17	STAR-CCM+ can work together with ABAQUS, but I think the FSI is a one-way approach and thus the two software can only be loosely coulped. Maybe only CFX can do a fully coupled FSI simulation. Last edited by panda; April 19, 2009 at 22:45.

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April 16, 2009, 05:51		#2
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	1. With STAR-CCM+ I read that you can both import and export surface data with abaqus, so you can do manual coupling of the codes (eg map temperatures from one to the other), and this could be automated to some extend with macros. STAR-CD can do two direct FSI coupling with abaqus so both solvers are running simultaneously. But do you really need abaqus, since STAR-CCM+ can now solve the stress equations, so many FSI problems are very simple and much more efficiently solved than any other linking/mapping approach. 2. Free fall with 6DOF is very feasible - see an example of a shipping container falling into water here: http://www.cd-adapco.com/media/videos/6dof/slamming.swf and how to set up a ship 6DOF model too: http://www.cd-adapco.com/media/demos.../DFBI_demo.swf You can ignore the wave model and just set you free surface level somewhere below the object you want to free fall.

November 24, 2009, 21:20		#4
nomad Member John Join Date: Aug 2009 Posts: 92 Rep Power: 16	Does this need region interfacing, or is it just a simple volume mesh? I tried this with a windmill rotor, but can't seem to get any rpm out of it.

November 25, 2009, 00:02		#5
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	It depends what you mean: You only require multiple regions when you need different physics or mesh types within each. And then you only need interfacing if you want some connectivity between the regions. If the windmill is rotating (either MRF or rigid body motion) then you need a separate region to applied these conditions to. Can't see any need for 6DOF in this case since the stress solve will calculate the deflections. If you what to solve stress within STAR-CCM+ then the solid rotor would also be another region and and interfaced to the fluid. Rotor deflection and coupling to the fluid is controlled automaticall for example by selecting the Large Deflection option after the Stress model is selected. If you really want to couple to abaqus (not really required) you can do two way coupling in the code now by adding a macro to the solve and thus automate the backwards and forwards export and import process.