[ANSYS Meshing] Reducing mesh size along z-axis for 3D conjugate heat transfer problem

fluentnewb · May 9, 2020, 14:02

Hi everyone

I am attempting to model a single fin of a heat sink, surrounded by air, as a conjugate heat transfer problem. As it is only a single fin, my domain is much larger in the x and y directions than it is in the z.

My problem is that I cannot get a fine enough mesh size in the z-direction to capture the boundary layer without making my entire mesh tiny, which I cannot really afford to do.

I have tried using edge sizing with hard behavior, with multizone, tetrehedral and even hex-dominant methods, but the size doesn't permeate through the whole domain. If I use inflation, ANSYS I can't the overall thickness to what I need it to be.

Is there a setting I am missing or is this approach completely inappropriate? I can upload a picture of the domain if it will help.

Cheers!

AtoHM · May 9, 2020, 16:50

Go ahead with that image

fluentnewb · May 9, 2020, 23:55

Quote:

Originally Posted by AtoHM

Go ahead with that image

This is the domain I have, please let me know if there's anything else that will help

fluentnewb · May 10, 2020, 03:51

domainall.png

It appears that my previous reply didn't link the image properly, hopefully this works, thanks

May 9, 2020, 14:02	Reducing mesh size along z-axis for 3D conjugate heat transfer problem	#1
fluentnewb New Member Anthony Join Date: May 2020 Posts: 4 Rep Power: 6	Hi everyone I am attempting to model a single fin of a heat sink, surrounded by air, as a conjugate heat transfer problem. As it is only a single fin, my domain is much larger in the x and y directions than it is in the z. My problem is that I cannot get a fine enough mesh size in the z-direction to capture the boundary layer without making my entire mesh tiny, which I cannot really afford to do. I have tried using edge sizing with hard behavior, with multizone, tetrehedral and even hex-dominant methods, but the size doesn't permeate through the whole domain. If I use inflation, ANSYS I can't the overall thickness to what I need it to be. Is there a setting I am missing or is this approach completely inappropriate? I can upload a picture of the domain if it will help. Cheers!

May 10, 2020, 03:51	Domain	#4
fluentnewb New Member Anthony Join Date: May 2020 Posts: 4 Rep Power: 6	domainall.png It appears that my previous reply didn't link the image properly, hopefully this works, thanks

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May 9, 2020, 16:50		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 703 Rep Power: 13	Go ahead with that image