ANSA 2D Meshing?

eishinsnsayshin · March 24, 2012, 11:10

Hello All,
This might sound like a stupid question. I'm an undergrad who has co-oped in the automotive industry doing CFD. I've used ANSA for lots of 3D meshing. For school projects, is there any way ANSA can be used to mesh for a 2D problem (like flow over a 2D airfoil)? I was thinking about it and I'm not sure how I would do that...The ANSA I'm familiar with is only 3D...is there a 2D version or something?

Thanks for any help!

eishinsnsayshin · March 26, 2012, 11:06

OK, so I figure no one has responded because I'm not specific enough or something. That's usually the case. Let me try something else:

Let's say I have a circular surface (cross section of a cylinder) floating in space that I want to run a simulation in fluent around. So I make a circle in ANSA in the x-z plane. I then make a rectangular surface for the domain in the same plane around the circle. I mesh both surfaces, so everything is still just in the x-z plane.

Now I don't know what to do. To use 2D FLUENT, do I extrude these two surfaces in the Y direction by one step (using volumes>extrude), then use elements>vol-shel along the outer boundaries to make shells for an inlet, and the outlets to assign PID's? I can't get the .msh file to read into FLUENT.

The other option is to use trasf.>copy and make a duplicate translated copy some distance in the y direction. Then close the surface using surf>coons or something, then do a volume mesh for the inside and create an STL, but this doesnt seem to work either. Any ideas? I would imagine someone out there has probably done something like this! How do you create something 3d in ANSA be able to be read in 2D fluent?

Thanks!

vangelis · March 27, 2012, 04:01

Hi there,

In order to prepare a model in ANSA for Fluent 2D
you need first of all to draw your model in
XY plane (not along Z axis).

For a flow past a cylinder example, you need to
draw a rectangular domain and in it the circle which you will Project and cut on the domain.
You will delete the Face inside the circle and mesh the outer with a nice ADV.FR or CFD mesh.

You should activate the FLUENT 2D Deck in ANSA
so that you can also assign the Boundary Conditions along the boundary CONS. Please refer to section 23.3.3 of the ANSA Users Guide.

Let me know if there is a problem.
Best regards
Vangelis

eishinsnsayshin · March 27, 2012, 17:27

Hey thanks for the reply, I got everything working now!

vangelis · March 28, 2012, 07:10

glad it worked for you

March 24, 2012, 11:10	ANSA 2D Meshing?	#1
eishinsnsayshin Member Join Date: Jun 2011 Posts: 48 Rep Power: 3	Hello All, This might sound like a stupid question. I'm an undergrad who has co-oped in the automotive industry doing CFD. I've used ANSA for lots of 3D meshing. For school projects, is there any way ANSA can be used to mesh for a 2D problem (like flow over a 2D airfoil)? I was thinking about it and I'm not sure how I would do that...The ANSA I'm familiar with is only 3D...is there a 2D version or something? Thanks for any help!

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March 26, 2012, 11:06		#2
eishinsnsayshin Member Join Date: Jun 2011 Posts: 48 Rep Power: 3	OK, so I figure no one has responded because I'm not specific enough or something. That's usually the case. Let me try something else: Let's say I have a circular surface (cross section of a cylinder) floating in space that I want to run a simulation in fluent around. So I make a circle in ANSA in the x-z plane. I then make a rectangular surface for the domain in the same plane around the circle. I mesh both surfaces, so everything is still just in the x-z plane. Now I don't know what to do. To use 2D FLUENT, do I extrude these two surfaces in the Y direction by one step (using volumes>extrude), then use elements>vol-shel along the outer boundaries to make shells for an inlet, and the outlets to assign PID's? I can't get the .msh file to read into FLUENT. The other option is to use trasf.>copy and make a duplicate translated copy some distance in the y direction. Then close the surface using surf>coons or something, then do a volume mesh for the inside and create an STL, but this doesnt seem to work either. Any ideas? I would imagine someone out there has probably done something like this! How do you create something 3d in ANSA be able to be read in 2D fluent? Thanks!

March 27, 2012, 04:01		#3
vangelis Senior Member Vangelis Skaperdas Join Date: Mar 2009 Location: Thessaloniki, Greece Posts: 115 Rep Power: 7	Hi there, In order to prepare a model in ANSA for Fluent 2D you need first of all to draw your model in XY plane (not along Z axis). For a flow past a cylinder example, you need to draw a rectangular domain and in it the circle which you will Project and cut on the domain. You will delete the Face inside the circle and mesh the outer with a nice ADV.FR or CFD mesh. You should activate the FLUENT 2D Deck in ANSA so that you can also assign the Boundary Conditions along the boundary CONS. Please refer to section 23.3.3 of the ANSA Users Guide. Let me know if there is a problem. Best regards Vangelis

March 27, 2012, 17:27		#4
eishinsnsayshin Member Join Date: Jun 2011 Posts: 48 Rep Power: 3	Hey thanks for the reply, I got everything working now!

March 28, 2012, 07:10		#5
vangelis Senior Member Vangelis Skaperdas Join Date: Mar 2009 Location: Thessaloniki, Greece Posts: 115 Rep Power: 7	glad it worked for you