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P_J_B December 22, 2011 08:55

Modeling PCB in CFX

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.


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 18:34

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

ghorrocks March 29, 2012 23:30

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

The Slant Star July 3, 2014 12:10

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.

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