How to set up transient one way coupling?

peiji1984 · November 16, 2010, 14:41

Hello everyone!

From the "Oscillating Plate with Two-Way Fluid-Structure Interaction" in CFX Tutorials and other documents, I found that generally for ANSYS packet(CFX and multi-field solvor) two way coupling calculation can be transient, but many cases for one way coupling are steady. I mean, like exporting the CFX result files and adding it to strucure in Workbench manually for each time step.
How can I set up a transient one way coupling calculation using MFX which can be calculate for every time step automatically, or some other mehtod? I didn't find many statements about it in ANSYS help, just something about using "Additional Coupling Sent Data" for coupling wall boundary specification and setting the mesh motion to stationay in CFX Pre. Is that way OK? It seems to be OK, but I am not sure. Also, if to do so, is just single stagger iteration enough? Convergence criterion for stagger iteration is unmeaningful, right?

Thank you~

jfmorissette · March 18, 2011, 08:52

Hi,

actually, ANSYS doesn't make it really obvious, but the way to dot it is to use the transient 2-way FSI framework, but in CFX, you could specify to not send back displacement to CFX, so only fluid forces will be transfered to ansys.

Hope it will help!

peiji1984 · March 18, 2011, 09:44

Thank you for your reply and help, jfmorissette! It is very kind of you.

I think you are right, ANSYS doesn't make it really obvious. That's why I am not sure that this way is right or not.

Ji Pei

November 16, 2010, 14:41	How to set up transient one way coupling?	#1
peiji1984 New Member Ji Pei Join Date: Nov 2010 Posts: 8 Rep Power: 15	Hello everyone! From the "Oscillating Plate with Two-Way Fluid-Structure Interaction" in CFX Tutorials and other documents, I found that generally for ANSYS packet(CFX and multi-field solvor) two way coupling calculation can be transient, but many cases for one way coupling are steady. I mean, like exporting the CFX result files and adding it to strucure in Workbench manually for each time step. How can I set up a transient one way coupling calculation using MFX which can be calculate for every time step automatically, or some other mehtod? I didn't find many statements about it in ANSYS help, just something about using "Additional Coupling Sent Data" for coupling wall boundary specification and setting the mesh motion to stationay in CFX Pre. Is that way OK? It seems to be OK, but I am not sure. Also, if to do so, is just single stagger iteration enough? Convergence criterion for stagger iteration is unmeaningful, right? Thank you~

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March 18, 2011, 08:52		#2
jfmorissette New Member Jean-François Morissette Join Date: Dec 2010 Location: Montreal Posts: 4 Rep Power: 15	Hi, actually, ANSYS doesn't make it really obvious, but the way to dot it is to use the transient 2-way FSI framework, but in CFX, you could specify to not send back displacement to CFX, so only fluid forces will be transfered to ansys. Hope it will help!

March 18, 2011, 09:44		#3
peiji1984 New Member Ji Pei Join Date: Nov 2010 Posts: 8 Rep Power: 15	Thank you for your reply and help, jfmorissette! It is very kind of you. I think you are right, ANSYS doesn't make it really obvious. That's why I am not sure that this way is right or not. Ji Pei