HTC on two sides wall

igor_vidic · June 26, 2019, 12:06

Hello everyone,
Can somebody please explain me how Fluent solve heat trsnsfer problem on coupled wall. For example I am modeling fluid flow around cylinder with energy source in it. I don understand how fluent calculate heat transfer coefficient between fluid and solid. I read that coupling wall means that heat flux is the same on boundary and its shadow zone.

LuckyTran · June 26, 2019, 17:54

The heat flux on both sides of the interface is the same on the coupled wall (via energy balance). On the fluid side, the energy transport equation is solved for temperature/energy. On the solid side, the heat equation is solved for temperature/energy. Eventually you can get a heat flux.

It's similar to solving the flow around a cylinder with a heat flux boundary condition, except that the heat flux is now a free variable and not a fixed value.

Heat transfer coefficient is a post-processed quantity that is calculated after-the-fact using the heat flux.

igor_vidic · June 27, 2019, 03:51

Thank you very much for your replay. Does it mean that solver calculate temperature values in every cell from these two equation (transport energy equation for fluid and heat equation for solid)?

June 26, 2019, 12:06	HTC on two sides wall	#1
igor_vidic New Member Igor Vidic Join Date: Apr 2019 Posts: 12 Rep Power: 7	Hello everyone, Can somebody please explain me how Fluent solve heat trsnsfer problem on coupled wall. For example I am modeling fluid flow around cylinder with energy source in it. I don understand how fluent calculate heat transfer coefficient between fluid and solid. I read that coupling wall means that heat flux is the same on boundary and its shadow zone. Last edited by igor_vidic; June 26, 2019 at 15:48.

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June 26, 2019, 17:54		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	The heat flux on both sides of the interface is the same on the coupled wall (via energy balance). On the fluid side, the energy transport equation is solved for temperature/energy. On the solid side, the heat equation is solved for temperature/energy. Eventually you can get a heat flux. It's similar to solving the flow around a cylinder with a heat flux boundary condition, except that the heat flux is now a free variable and not a fixed value. Heat transfer coefficient is a post-processed quantity that is calculated after-the-fact using the heat flux.

June 27, 2019, 03:51		#3
igor_vidic New Member Igor Vidic Join Date: Apr 2019 Posts: 12 Rep Power: 7	Thank you very much for your replay. Does it mean that solver calculate temperature values in every cell from these two equation (transport energy equation for fluid and heat equation for solid)?