[ANSYS Meshing] Geometry-Air Domain

cysanghavi · May 16, 2016, 18:56

Hello,
I have a complex geometry, where I want to simulate the air flow within the cooling channel of a drilling tool.
simulate.JPG

I want to simulate only the air flow within the cooling channel and not exterior to the cooling channel.
how to delete the air domain, which does not belong to the cooling channel ?

Does this make physical sense ? Since I am only interested in the temperrature profile of the tool at the outlet.
this is a CHT type CFD application.

Hope I make my point clear,

Thanks and Regards
Chaitanya

Micael · May 17, 2016, 10:55

In either DesignModeler or ANSYS MESHING, can you pick the volume of the cooling channel? I mean, do you have a "body" that occupies only the cooling channel? If yes, you just have to "suppress" the other bodies and you will be left with only the body you are interrested to simulate.

cysanghavi · May 17, 2016, 17:14

Hi,
Nope, unfortunately, I directly got the .stp file for my project and I do not have that stored as a body. In that case, suppressing was a real good way out.
I will try to look into the meshing module.

Micael · May 17, 2016, 17:18

So, in Design Modeler you Create->Import External Geometry File... then pick your STP file, then press Generate?

cysanghavi · May 17, 2016, 17:25

Quote:

Originally Posted by Micael

So, in Design Modeler you Create->Import External Geometry File... then pick your STP file, then press Generate?

Yes. exactly.

Micael · May 17, 2016, 17:33

how many body do you get then? Can you provide a printscreen of DesignModeler tree?

cysanghavi · May 17, 2016, 17:36

Quote:

Originally Posted by Micael

how many body do you get then? Can you provide a printscreen of DesignModeler tree?

Capture.jpg

I just get the .stp file on import.check the screen shot

Steffen595 · May 18, 2016, 03:10

there is just 1 body then. Don't you have a CAD of sorts, where you can import it and then subtract it from a cylinder.
Or I guess in design modeller you can model a cylinder and then subtract thad body. I believe, there is somethong like that even in the mesher. There are a bunch of tutorials, multibody domain is the word(s). Shows how to make one solid inside the other one.
The most convenient way is use a CAD program.

Stuttgart, ey, Viertele-Schlotzer.

edit: there is a forum www.cad.de. I reckon, someone in there would extract what you want,if you are able to upload your stp file

Micael · May 18, 2016, 16:57

Pick the 2 edges I highlighted in red then create surfaces:
Concept->Surfaces From Edges
then try to fill the cavity:
Tools->Fill, choose "By Cavity"

Hopefully this will work.

cysanghavi · May 20, 2016, 10:12

It did not work. But I used Solidworks and managed to use surface commands to fill up the material and Export it.
I could not get the exact Profile since the cooling channels had a complex geometry.
But the model works. But, it could not recognize the Interface in the CFX pre-processor. :P
Hope,it gives convergence. !

cysanghavi · May 20, 2016, 10:13

Thanks for your Inputs and efforts. !!

Steffen595 · May 20, 2016, 18:43

would be just a sweep of a circle on a spiral?

cysanghavi · May 24, 2016, 09:39

Nope, sweep does not work. I have the outlet a curved surface. So, sweep does not work.
I found out a way:
1. Solidworks. - Use offset surfaces, offset entities, fill the surfaces, use surface knit with high GT for Gap. and it works. !!
2. Rhyno can also be used. !

May 16, 2016, 18:56	Geometry-Air Domain	#1
cysanghavi Member Chaitanya Join Date: Mar 2016 Location: Stuttgart, Germany Posts: 50 Rep Power: 10	Hello, I have a complex geometry, where I want to simulate the air flow within the cooling channel of a drilling tool. simulate.JPG I want to simulate only the air flow within the cooling channel and not exterior to the cooling channel. how to delete the air domain, which does not belong to the cooling channel ? Does this make physical sense ? Since I am only interested in the temperrature profile of the tool at the outlet. this is a CHT type CFD application. Hope I make my point clear, Thanks and Regards Chaitanya

May 18, 2016, 03:10		#8
Steffen595 Senior Member Join Date: May 2012 Location: Melbourne Posts: 161 Rep Power: 13	there is just 1 body then. Don't you have a CAD of sorts, where you can import it and then subtract it from a cylinder. Or I guess in design modeller you can model a cylinder and then subtract thad body. I believe, there is somethong like that even in the mesher. There are a bunch of tutorials, multibody domain is the word(s). Shows how to make one solid inside the other one. The most convenient way is use a CAD program. Stuttgart, ey, Viertele-Schlotzer. edit: there is a forum www.cad.de. I reckon, someone in there would extract what you want,if you are able to upload your stp file Last edited by Steffen595; May 18, 2016 at 07:54.

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May 17, 2016, 10:55		#2
Micael Senior Member Micael Join Date: Mar 2009 Location: Canada Posts: 156 Rep Power: 18	In either DesignModeler or ANSYS MESHING, can you pick the volume of the cooling channel? I mean, do you have a "body" that occupies only the cooling channel? If yes, you just have to "suppress" the other bodies and you will be left with only the body you are interrested to simulate.

May 17, 2016, 17:14		#3
cysanghavi Member Chaitanya Join Date: Mar 2016 Location: Stuttgart, Germany Posts: 50 Rep Power: 10	Hi, Nope, unfortunately, I directly got the .stp file for my project and I do not have that stored as a body. In that case, suppressing was a real good way out. I will try to look into the meshing module.

May 17, 2016, 17:18		#4
Micael Senior Member Micael Join Date: Mar 2009 Location: Canada Posts: 156 Rep Power: 18	So, in Design Modeler you Create->Import External Geometry File... then pick your STP file, then press Generate?

May 17, 2016, 17:33		#6
Micael Senior Member Micael Join Date: Mar 2009 Location: Canada Posts: 156 Rep Power: 18	how many body do you get then? Can you provide a printscreen of DesignModeler tree?

May 20, 2016, 10:12		#10
cysanghavi Member Chaitanya Join Date: Mar 2016 Location: Stuttgart, Germany Posts: 50 Rep Power: 10	It did not work. But I used Solidworks and managed to use surface commands to fill up the material and Export it. I could not get the exact Profile since the cooling channels had a complex geometry. But the model works. But, it could not recognize the Interface in the CFX pre-processor. :P Hope,it gives convergence. !

May 20, 2016, 10:13		#11
cysanghavi Member Chaitanya Join Date: Mar 2016 Location: Stuttgart, Germany Posts: 50 Rep Power: 10	Thanks for your Inputs and efforts. !!

May 20, 2016, 18:43		#12
Steffen595 Senior Member Join Date: May 2012 Location: Melbourne Posts: 161 Rep Power: 13	would be just a sweep of a circle on a spiral?

May 24, 2016, 09:39		#13
cysanghavi Member Chaitanya Join Date: Mar 2016 Location: Stuttgart, Germany Posts: 50 Rep Power: 10	Nope, sweep does not work. I have the outlet a curved surface. So, sweep does not work. I found out a way: 1. Solidworks. - Use offset surfaces, offset entities, fill the surfaces, use surface knit with high GT for Gap. and it works. !! 2. Rhyno can also be used. !