Thermal Solid and CFD analysis combined in Fluent.

cysanghavi · April 14, 2016, 07:59

Is is possible to simulate condcution- convection of heat in a solid in Fluent. ?
Application:
I have an air flow throguh a solid tube, but the temperature of the solid tube is different along the length of the tube due to conduction and convection processes. ?
If yes, can some send me the tutorial associated with this?

LuckyTran · April 15, 2016, 15:28

This is a conjugate heat transfer simulation. It is fairly straighforward to do a long as you have a basic understanding of CFD.

You just need to mesh both the fluid and solid regions and create an mesh interface at the solid-fluid interface. Do this is your meshing utility. The exact way to do it depends on what you are using to generate the grid. The meshing rules in the solid region are fairly lax.

Define the materials for each mesh zone and apply them to the solid zone and fluid zone respectively.

Give the appropriate boundary conditions at all the other boundaries (fluid inlet, fluid outlet, and the other boundaries for the solid). At the interface, use the no-slip condition for velocity/momentum and coupled for thermal.

Note if your solid is thin, you can model the heat conduction at the thin walls using the thin wall & shell conduction models in the wall boundary conditions (you won't need to mesh the solid this way).

April 14, 2016, 07:59	Thermal Solid and CFD analysis combined in Fluent.	#1
cysanghavi Member Chaitanya Join Date: Mar 2016 Location: Stuttgart, Germany Posts: 50 Rep Power: 10	Is is possible to simulate condcution- convection of heat in a solid in Fluent. ? Application: I have an air flow throguh a solid tube, but the temperature of the solid tube is different along the length of the tube due to conduction and convection processes. ? If yes, can some send me the tutorial associated with this?

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April 15, 2016, 15:28		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,762 Rep Power: 66	This is a conjugate heat transfer simulation. It is fairly straighforward to do a long as you have a basic understanding of CFD. You just need to mesh both the fluid and solid regions and create an mesh interface at the solid-fluid interface. Do this is your meshing utility. The exact way to do it depends on what you are using to generate the grid. The meshing rules in the solid region are fairly lax. Define the materials for each mesh zone and apply them to the solid zone and fluid zone respectively. Give the appropriate boundary conditions at all the other boundaries (fluid inlet, fluid outlet, and the other boundaries for the solid). At the interface, use the no-slip condition for velocity/momentum and coupled for thermal. Note if your solid is thin, you can model the heat conduction at the thin walls using the thin wall & shell conduction models in the wall boundary conditions (you won't need to mesh the solid this way).