Geometry basics. How do i model an open domain to simulate a jet flow

canev.civelek · March 1, 2012, 10:52

Hi there,
I am a new user to ANSYS and im struggling to create the geometry of a simple open domain. This will be the volume i will mesh to investigate a simple jet flow.

Ive tried doing a simple line diagram of the size and shape of the domain in the geometry section in workbench however when trying to open this in mesh states 'unable bodies found'.

I also tried making 2 faces (For the front and rear faces) and connecting them together however im still getting errors.

I know its just a simple setting or way to set this up however i cant find any iformation regarding this in the users guide.

Please let me know if you can help or where i may be able to get help from.

Thanks so much

krisshoe · March 1, 2012, 12:09

Have you tried to use the extrude function? Draw a 2D sketch of one side of your box, and then extrude that sketch. You can specify the length of the extrusion.

canev.civelek · March 1, 2012, 12:14

Hi there.

My first thought was to extrude it but then it will become a solid.

I am trying to create an open 3D or even 2D area where i can simulate a jet flow and view the behaviour.

Do you know if its possible to mesh a solid and then define it as open air during simulation?

Thanks.

krisshoe · March 1, 2012, 12:33

You can change your body type from Solid to Fluid in the details of your body in Design Modeler. However, once you mesh your flow domain, you should be able to read it into FLuent, even if it is a solid body type. I'm certain I've done this before.

canev.civelek · March 1, 2012, 13:00

Can i change the body type into air?

Its a volume that i am meant to specify (Which is the domain) and simulate a air jet coming into this domain.
So its essentially air flow into air.

I just need to specify the volume to mesh.

I meshed a solid before however i was told this was not correct, that i cannot use a solid body. (I did try but couldnt work it out so thought he was right). Is he wrong?

Do you know how to change the solid body into an air domain?

Thanks for your input, its much appreciated.

scipy · March 1, 2012, 18:14

I think a video I just made might help you a bit. It was aimed more at vehicle aerodynamics, but since it's just about creating an air domain it might be useful.

Part 1a: http://www.youtube.com/watch?v=dZR7Wi70Vec
Part 1b: http://www.youtube.com/watch?v=oFD9346U8zM

Meshing and other parts will be up tomorrow or at the latest by the weekend.

canev.civelek · March 12, 2012, 05:49

Hi Scipy,

The tutorials were extremely helpful. Thanks so much for the link. I know what you mean by there being lack of support for beginners.

Will you have any more tutorials coming out any time soon?

Thanks again

scipy · March 12, 2012, 06:26

Yes, I've just been busy this week. There are Fluent and CFD-Post tutorials in the making, as the video descriptions say.

March 1, 2012, 10:52	Geometry basics. How do i model an open domain to simulate a jet flow	#1
canev.civelek New Member Jan Join Date: Feb 2012 Location: UK Posts: 24 Rep Power: 14	Hi there, I am a new user to ANSYS and im struggling to create the geometry of a simple open domain. This will be the volume i will mesh to investigate a simple jet flow. Ive tried doing a simple line diagram of the size and shape of the domain in the geometry section in workbench however when trying to open this in mesh states 'unable bodies found'. I also tried making 2 faces (For the front and rear faces) and connecting them together however im still getting errors. I know its just a simple setting or way to set this up however i cant find any iformation regarding this in the users guide. Please let me know if you can help or where i may be able to get help from. Thanks so much

March 1, 2012, 18:14		#6
scipy Senior Member Alex Pasic Join Date: Aug 2011 Location: Croatia Posts: 199 Rep Power: 16	I think a video I just made might help you a bit. It was aimed more at vehicle aerodynamics, but since it's just about creating an air domain it might be useful. Part 1a: http://www.youtube.com/watch?v=dZR7Wi70Vec Part 1b: http://www.youtube.com/watch?v=oFD9346U8zM Meshing and other parts will be up tomorrow or at the latest by the weekend. canev.civelek likes this.

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March 1, 2012, 12:09		#2
krisshoe New Member Join Date: Aug 2011 Posts: 9 Rep Power: 15	Have you tried to use the extrude function? Draw a 2D sketch of one side of your box, and then extrude that sketch. You can specify the length of the extrusion.

March 1, 2012, 12:14		#3
canev.civelek New Member Jan Join Date: Feb 2012 Location: UK Posts: 24 Rep Power: 14	Hi there. My first thought was to extrude it but then it will become a solid. I am trying to create an open 3D or even 2D area where i can simulate a jet flow and view the behaviour. Do you know if its possible to mesh a solid and then define it as open air during simulation? Thanks.

March 1, 2012, 12:33		#4
krisshoe New Member Join Date: Aug 2011 Posts: 9 Rep Power: 15	You can change your body type from Solid to Fluid in the details of your body in Design Modeler. However, once you mesh your flow domain, you should be able to read it into FLuent, even if it is a solid body type. I'm certain I've done this before.

March 1, 2012, 13:00		#5
canev.civelek New Member Jan Join Date: Feb 2012 Location: UK Posts: 24 Rep Power: 14	Can i change the body type into air? Its a volume that i am meant to specify (Which is the domain) and simulate a air jet coming into this domain. So its essentially air flow into air. I just need to specify the volume to mesh. I meshed a solid before however i was told this was not correct, that i cannot use a solid body. (I did try but couldnt work it out so thought he was right). Is he wrong? Do you know how to change the solid body into an air domain? Thanks for your input, its much appreciated.

March 12, 2012, 05:49		#7
canev.civelek New Member Jan Join Date: Feb 2012 Location: UK Posts: 24 Rep Power: 14	Hi Scipy, The tutorials were extremely helpful. Thanks so much for the link. I know what you mean by there being lack of support for beginners. Will you have any more tutorials coming out any time soon? Thanks again

March 12, 2012, 06:26		#8
scipy Senior Member Alex Pasic Join Date: Aug 2011 Location: Croatia Posts: 199 Rep Power: 16	Yes, I've just been busy this week. There are Fluent and CFD-Post tutorials in the making, as the video descriptions say.