ANSYS System coupling for the problem of pipe thermal expansion

Alzy · May 10, 2020, 04:15

Hi everyone,

I'm trying to evaluate how pipe's thermal expansion due to a flow of hot air inside it affects the flow. It is supposed to be a steady-state simulation. I understand that I should couple ANSYS CFX, Steady-state Thermal and Static Structural results while solving. I have seen lots of tutorials on two-way fluid-solid interaction, yet there are only pressure fields exported from CFX/Fluent.

The problem is that I have to make solvers share not only pressure fields (on pipe surface) but also temperature ones (firstly, on internal pipe's surface, from CFX to Steady-state Thermal, then from Steady-state Thermal to Static Structural to evaluate displacements in pipe).

I tried to solve the problem using Ansys System Coupling, but it doesn't support 3 analysis systems. I'm aware of Ansys Multifield, yet don't have a clue how to use it.

Does anyone have suggestions? Is it possible to solve the problem using two-way FSI?

evcelica · May 12, 2020, 09:07

You don't need 2-way FSI. Why do you need steady state thermal if you have already solved for the pipes Temperature in CFX? Or did you leave the pipe out?
I any case, just export your data of interest from CFX post as a table of values (x,y,z,T). (File >> Export) Use "external data" in workbench to use that table in any other mechanical analysis.

May 10, 2020, 04:15	ANSYS System coupling for the problem of pipe thermal expansion	#1
Alzy New Member Almir Zinnatullin Join Date: May 2020 Posts: 1 Rep Power: 0	Hi everyone, I'm trying to evaluate how pipe's thermal expansion due to a flow of hot air inside it affects the flow. It is supposed to be a steady-state simulation. I understand that I should couple ANSYS CFX, Steady-state Thermal and Static Structural results while solving. I have seen lots of tutorials on two-way fluid-solid interaction, yet there are only pressure fields exported from CFX/Fluent. The problem is that I have to make solvers share not only pressure fields (on pipe surface) but also temperature ones (firstly, on internal pipe's surface, from CFX to Steady-state Thermal, then from Steady-state Thermal to Static Structural to evaluate displacements in pipe). I tried to solve the problem using Ansys System Coupling, but it doesn't support 3 analysis systems. I'm aware of Ansys Multifield, yet don't have a clue how to use it. Does anyone have suggestions? Is it possible to solve the problem using two-way FSI?

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May 12, 2020, 09:07		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	You don't need 2-way FSI. Why do you need steady state thermal if you have already solved for the pipes Temperature in CFX? Or did you leave the pipe out? I any case, just export your data of interest from CFX post as a table of values (x,y,z,T). (File >> Export) Use "external data" in workbench to use that table in any other mechanical analysis.