Ground temperature

hyderkhan74 · July 25, 2012, 04:49

Hi
I just wonder how to model the ground temperature, when using conjugate heat transfer method in CFD programs to make simulation for the thermal processes (energy simulation) in building. In other words if I use CFD program to make thermal simulation for the building (with CFD simulation) ,how to set the thermal boundary condition at the ground.
With regards

Richard Parker · July 25, 2012, 07:14

Hello,

Naturally, it depends in the CFD package you use. In Fluent, for example, you can enable the Energy equations and then add Temperature or Heat Flux in the Wall Boundary condition.

It should be straightforward!

Josep

hyderkhan74 · July 25, 2012, 09:17

Dear Josep ,thank you for your prompt reply ,I know about the energy equation but I ask about the ground (in touch with earth mass) which can`t deal with it as normal wall ?

flotus1 · July 25, 2012, 10:32

Assuming that the heat storage capacity of the earth is quite huge, you could go wit a fixed temperature boundary condition.

If this is not accurate enough, your computational domain could encompass the ground to a certain depth.

July 25, 2012, 04:49	Ground temperature	#1
hyderkhan74 Member hayder Join Date: Jan 2012 Posts: 32 Rep Power: 14	Hi I just wonder how to model the ground temperature, when using conjugate heat transfer method in CFD programs to make simulation for the thermal processes (energy simulation) in building. In other words if I use CFD program to make thermal simulation for the building (with CFD simulation) ,how to set the thermal boundary condition at the ground. With regards

July 25, 2012, 10:32		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Assuming that the heat storage capacity of the earth is quite huge, you could go wit a fixed temperature boundary condition. If this is not accurate enough, your computational domain could encompass the ground to a certain depth. hyderkhan74 likes this.

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July 25, 2012, 07:14		#2
Richard Parker New Member Richard Parker Join Date: Jul 2012 Posts: 10 Rep Power: 13	Hello, Naturally, it depends in the CFD package you use. In Fluent, for example, you can enable the Energy equations and then add Temperature or Heat Flux in the Wall Boundary condition. It should be straightforward! Josep

July 25, 2012, 09:17		#3
hyderkhan74 Member hayder Join Date: Jan 2012 Posts: 32 Rep Power: 14	Dear Josep ,thank you for your prompt reply ,I know about the energy equation but I ask about the ground (in touch with earth mass) which can`t deal with it as normal wall ?