Modeling PCB in CFX

P_J_B · December 22, 2011, 08:55

Hi,

I will perform thermal management simulations for a electronic box, contaning heatgenerating components attatched to an PCB-card. ISs there anyone that have any "smart" idea how to model the PCB? implementing a detailed model of the PCB-card will be horrible to handel and as far as I know ther is no predefined PCB-models in CFX.

HELP ME!!!

ghorrocks · December 22, 2011, 16:57

You can simply model it as a heat source. Is that all you are looking for? You can make the heat source as complex as you like if you want the heat coming out of individual components, or simple and just assume it is a big box with evenly distributed heat.

P_J_B · December 23, 2011, 02:43

That I know, my question is more about the modelin of the PBC-card to simulate the ortotropic heat transfer in the direction of the cupper layers.

ghorrocks · December 23, 2011, 05:00

CFX has orthotropic thermal conductivity. But my PCBs are generally made of copper, haven't seen many made of cupper.

RaceCarDriver16 · March 29, 2012, 19:34

1)Hand calc thermal properties in each direction
2)use orthotropic material in CFX
3) Profit

ghorrocks · March 30, 2012, 00:30

Nice one, but I think the underpants gnome skip step 2

The Slant Star · July 3, 2014, 13:10

I'm also doing similar simulations. Can anybody tell me does it make much difference using orthogonal thermal conductivity than just simply use isotropic thermal conductivity? I recall I did comparisons with horrible boundary layer mesh and the result was similar. But I don't believe in it anymore since I realized the mesh was way under standard.

December 22, 2011, 08:55	Modeling PCB in CFX	#1
P_J_B New Member Join Date: Dec 2011 Posts: 2 Rep Power: 0	Hi, I will perform thermal management simulations for a electronic box, contaning heatgenerating components attatched to an PCB-card. ISs there anyone that have any "smart" idea how to model the PCB? implementing a detailed model of the PCB-card will be horrible to handel and as far as I know ther is no predefined PCB-models in CFX. HELP ME!!!

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December 22, 2011, 16:57		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	You can simply model it as a heat source. Is that all you are looking for? You can make the heat source as complex as you like if you want the heat coming out of individual components, or simple and just assume it is a big box with evenly distributed heat.

December 23, 2011, 02:43		#3
P_J_B New Member Join Date: Dec 2011 Posts: 2 Rep Power: 0	That I know, my question is more about the modelin of the PBC-card to simulate the ortotropic heat transfer in the direction of the cupper layers.

December 23, 2011, 05:00		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	CFX has orthotropic thermal conductivity. But my PCBs are generally made of copper, haven't seen many made of cupper.

March 29, 2012, 19:34		#5
RaceCarDriver16 New Member Join Date: Mar 2012 Posts: 2 Rep Power: 0	1)Hand calc thermal properties in each direction 2)use orthotropic material in CFX 3) Profit

March 30, 2012, 00:30		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Nice one, but I think the underpants gnome skip step 2

July 3, 2014, 13:10		#7
The Slant Star New Member Zhou Zhenhao Join Date: Jul 2014 Posts: 2 Rep Power: 0	I'm also doing similar simulations. Can anybody tell me does it make much difference using orthogonal thermal conductivity than just simply use isotropic thermal conductivity? I recall I did comparisons with horrible boundary layer mesh and the result was similar. But I don't believe in it anymore since I realized the mesh was way under standard.