How do I solve the following heat transfer problem?

Sorabh · January 18, 2019, 12:37

I have the following problem to solve: a steel block is subjected to laser irradiation for a small amount of time. It’s then switched off and liquid nitrogen is flushed onto the metal. I wish to observe the thermal effects of such a process on the steel block.

How should I proceed? How do I make a '2D enclosure'? Any input would be greatly appreciated.

LuckyTran · January 18, 2019, 14:33

Well first you need to mesh the domain (steel block + nitrogen domain). What meshing tools have you decided to use? Have you done any tutorials.

Sorabh · January 19, 2019, 20:58

Quote:

Originally Posted by LuckyTran

Well first you need to mesh the domain (steel block + nitrogen domain). What meshing tools have you decided to use? Have you done any tutorials.

I am yet to understand how to define and differentiate the 2 different domains. All the tutorials I have checked do not take into account any thermophysical processes in the steel block..

LuckyTran · January 19, 2019, 21:32

You need separate cell zones. Once you've you've got a mesh with two cell zones, you just specify the steel block as a solid cell zone and you're pretty much done. It is a piece of cake. So your biggest hurdle is the meshing part.

Sorabh · January 24, 2019, 10:40

Yeah, I made the geometry part with relative ease, but I am stuck at meshing.

I can't seem to control the mesh of the inner zone no matter what mesh control methods I use.
I used edge sizing on all the edges, but the mesh of the inner zone won't change...
Help, please??

Sorabh · January 24, 2019, 10:43

EDIT: <removed double post>

Bluewave · February 4, 2019, 04:15

I suppose you're using Ansys meshing. Can you share a pic of the geometry? Sometimes Ansys meshing is a bad tool for meshing CFD domains.

RaiderDoctor · February 5, 2019, 20:22

Just out of curiosity, are you sure that when you are using edge sizing you are actually selecting the correct body? For instance, if you hide the exterior (gray) body and then apply edge sizing to the inner (blue) body, does it work?

mayurb · April 27, 2020, 13:54

Quote:

Originally Posted by Sorabh

I am yet to understand how to define and differentiate the 2 different domains. All the tutorials I have checked do not take into account any thermophysical processes in the steel block..

Dear Sorabh,

Have you solved your problem? Can you suggest me proper tutorial for this ? Thanks in advance

January 18, 2019, 12:37	How do I solve the following heat transfer problem?	#1
Sorabh Member Saurabh Das Join Date: Jul 2018 Posts: 43 Rep Power: 8	I have the following problem to solve: a steel block is subjected to laser irradiation for a small amount of time. It’s then switched off and liquid nitrogen is flushed onto the metal. I wish to observe the thermal effects of such a process on the steel block. How should I proceed? How do I make a '2D enclosure'? Any input would be greatly appreciated.

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January 18, 2019, 14:33		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,751 Rep Power: 66	Well first you need to mesh the domain (steel block + nitrogen domain). What meshing tools have you decided to use? Have you done any tutorials.

January 19, 2019, 21:32		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,751 Rep Power: 66	You need separate cell zones. Once you've you've got a mesh with two cell zones, you just specify the steel block as a solid cell zone and you're pretty much done. It is a piece of cake. So your biggest hurdle is the meshing part.

January 24, 2019, 10:40		#5
Sorabh Member Saurabh Das Join Date: Jul 2018 Posts: 43 Rep Power: 8	Yeah, I made the geometry part with relative ease, but I am stuck at meshing. I can't seem to control the mesh of the inner zone no matter what mesh control methods I use. I used edge sizing on all the edges, but the mesh of the inner zone won't change... Help, please??

January 24, 2019, 10:43		#6
Sorabh Member Saurabh Das Join Date: Jul 2018 Posts: 43 Rep Power: 8	EDIT: <removed double post>

February 4, 2019, 04:15		#7
Bluewave New Member SS Join Date: Sep 2018 Posts: 6 Rep Power: 8	I suppose you're using Ansys meshing. Can you share a pic of the geometry? Sometimes Ansys meshing is a bad tool for meshing CFD domains.

February 5, 2019, 20:22		#8
RaiderDoctor Senior Member Join Date: Dec 2016 Posts: 152 Rep Power: 10	Just out of curiosity, are you sure that when you are using edge sizing you are actually selecting the correct body? For instance, if you hide the exterior (gray) body and then apply edge sizing to the inner (blue) body, does it work?