Radtiation System Coupling Ansys

ehecboy · July 3, 2020, 08:54

My system consists of Fluent and Transient Structural. My goal is to pass on a heat flow consisting of radiation from Fluent to Mechanical. For this, Fluent gives the heat flow to Mechanical and Mechanical gives the wall temperature to Fluent. In addition, the cells in Mechanical were converted into "SOLID226" elements.

Unfortunately there is no heat exchange. Is there a way or is this ability not supported?

Gweher · July 3, 2020, 13:53

Hi,

First to start with, how did you setup your models in Workbench? There are different ways to transfer data between the systems to achieve what you need.

The Solid226 with the proper keyopt shouldn't be a limitation

ehecboy · July 3, 2020, 18:42

Thanks for your Reply,

In Mechanical I have a fluid-solid interface that receives the heat flow from Fluent. This interface is a Wall BC in Fluent. This is selected in the thermal as system coupling. Fluent recives Mechanical's interface temperature. The DO is used as the radiation model.
Which Keyopts do I need? Keyopts(2) and (6) are set to 1

Gweher · July 6, 2020, 02:11

Ok, just to be sure, you are using 3 systems:

- Fluent
- Transient Structural
- System coupling

The Fluent and Transient Structural setups cells should be connected to the setup cell of the system coupling.

In Mechanical you need to define the solid226 element with keyopt 1 = 11 as you want to perform a thermal-structural analysis (DOF, Ux, Uy, Uz, Temp).

Add a fluid solid interface and define the transfer to "All System Coupling Data Transfers".

Then in the system coupling you should define which load is transfer to the particular systems (Fluent / Transient Structural).

This should do the trick,

Have fun

ehecboy · July 7, 2020, 01:59

Thats more or less the exact setup of my calculation. Additional Keyopt(9)=1 and I have on the Interface a radiation AND convection heat flow. Could this be the problem that there can be just one heat flow?

Gweher · July 8, 2020, 02:52

If you're using surf152 element at that boundary it shouldn't be a problem as you can use them to define both radiation and convection.

Do you get any warning / error message from the coupling system or any of the Fluent / Mechanical setups ?

ehecboy · July 9, 2020, 12:43

There are no warnings regarding radiation.

I didn't specifically define the BC as a SURF152 Element. But I will give it a try.

Is there a command for defining a named selection?

July 3, 2020, 08:54	Radtiation System Coupling Ansys	#1
ehecboy New Member Join Date: Jul 2019 Posts: 23 Rep Power: 6	My system consists of Fluent and Transient Structural. My goal is to pass on a heat flow consisting of radiation from Fluent to Mechanical. For this, Fluent gives the heat flow to Mechanical and Mechanical gives the wall temperature to Fluent. In addition, the cells in Mechanical were converted into "SOLID226" elements. Unfortunately there is no heat exchange. Is there a way or is this ability not supported?

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July 3, 2020, 13:53		#2
Gweher Senior Member Gwenael H. Join Date: Mar 2011 Location: Switzerland Posts: 392 Rep Power: 20	Hi, First to start with, how did you setup your models in Workbench? There are different ways to transfer data between the systems to achieve what you need. The Solid226 with the proper keyopt shouldn't be a limitation

July 3, 2020, 18:42		#3
ehecboy New Member Join Date: Jul 2019 Posts: 23 Rep Power: 6	Thanks for your Reply, In Mechanical I have a fluid-solid interface that receives the heat flow from Fluent. This interface is a Wall BC in Fluent. This is selected in the thermal as system coupling. Fluent recives Mechanical's interface temperature. The DO is used as the radiation model. Which Keyopts do I need? Keyopts(2) and (6) are set to 1

July 6, 2020, 02:11		#4
Gweher Senior Member Gwenael H. Join Date: Mar 2011 Location: Switzerland Posts: 392 Rep Power: 20	Ok, just to be sure, you are using 3 systems: - Fluent - Transient Structural - System coupling The Fluent and Transient Structural setups cells should be connected to the setup cell of the system coupling. In Mechanical you need to define the solid226 element with keyopt 1 = 11 as you want to perform a thermal-structural analysis (DOF, Ux, Uy, Uz, Temp). Add a fluid solid interface and define the transfer to "All System Coupling Data Transfers". Then in the system coupling you should define which load is transfer to the particular systems (Fluent / Transient Structural). This should do the trick, Have fun

July 7, 2020, 01:59		#5
ehecboy New Member Join Date: Jul 2019 Posts: 23 Rep Power: 6	Thats more or less the exact setup of my calculation. Additional Keyopt(9)=1 and I have on the Interface a radiation AND convection heat flow. Could this be the problem that there can be just one heat flow?

July 8, 2020, 02:52		#6
Gweher Senior Member Gwenael H. Join Date: Mar 2011 Location: Switzerland Posts: 392 Rep Power: 20	If you're using surf152 element at that boundary it shouldn't be a problem as you can use them to define both radiation and convection. Do you get any warning / error message from the coupling system or any of the Fluent / Mechanical setups ?

July 9, 2020, 12:43		#7
ehecboy New Member Join Date: Jul 2019 Posts: 23 Rep Power: 6	There are no warnings regarding radiation. I didn't specifically define the BC as a SURF152 Element. But I will give it a try. Is there a command for defining a named selection?