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M
MW_104247924-Participant
4-Participant
September 21, 2022
Solved

flow model solid components not showing in results

  • September 21, 2022
  • 1 reply
  • 2489 views

I am modeling an electronics chassis with circuit cards in it.  The material properties of the PCBs are defined in the model and they are showing as solid components in the  simulation domains list.  The fluid domain appears to appropriately have "negative space" where the PCBs are.

 

MW_10424792_0-1663787997506.png

MW_10424792_1-1663788057065.png

 

However, when I run the model and I try to investigate the surface temperatures of the PCBs by selecting them in "boundary conditions", selecting "yes" for surfaces and "Temperature" for a variable, nothing shows up.  When I do a cut plane through the chassis, the heat dissipation from the PCBs is obviously changing the air temperature, but I can't see the PCBs themselves 

 

MW_10424792_2-1663788108322.png

MW_10424792_3-1663788154193.png

 

I'm a relatively new user so I suspect there's something basic I'm missing.  I've reviewed the tutorials and online documentation and it's not obvious to me what's going on.   

 

@tmoser you were very helpful yesterday - much appreciated!  If you have any insight to my issue above I'd be grateful 

 

Thanks

 

Mark

Best answer by tmoser

Yeah, that's right. You can keep the display on by setting "Keep drawing" to Yes on the View tab of those interfaces. If it gets in the way just set it back to No.

 

tmoser_0-1663792571418.png

 

1 reply

T
tmoser12-Amethyst
12-Amethyst
September 21, 2022

Could you show the physics that you have selected. And then a few more questions.

What are the properties for the PCB"s? Density, specific heat and thermal conductivity

How is the heat source set up?

How are the interfaces between the PCB's and the air defined? 

M
MW_104247924-ParticipantAuthor
4-Participant
September 21, 2022

Thanks for the quick reply!  Here are the physics

MW_10424792_0-1663790305495.png

 

here are the density, cond, spec heat, and load properties for each PCB

 

MW_10424792_1-1663790402749.png

here are the interfaces between the fluid (air) and the pcbs

MW_10424792_2-1663790547352.png

Any info you can provide would be great - thanks again!

 

Mark

 

 

 

 

M
MW_104247924-ParticipantAuthor
4-Participant
September 21, 2022

OK, since I highlighted the fluid - pcb interface, I see how that went active in the display.  I was able to select view surface and temperature in the interface section and now I can seethe temperatures of the PCBs.  For some reason I thought to see the temperatures of other components I needed to look under boundary conditions!  Is that basically the answer - select the interface and view that temperature?

 

thanks again

 

MW_10424792_3-1663791091094.png

 

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