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February 15, 2013, 08:03 |
Modeling a thin sail in Fluent
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#1 |
Member
Bart A.
Join Date: Feb 2012
Posts: 45
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I am trying to model a tetrahedral kite in CFD.
The model only consists of the sails, the aerodynamic influence of the frame is neglected. To get started I'm now only trying to model one cell of the tetrahedral kite, so only two sails. As the sail material is very thin I am wondering how to model this geometry for use in Fluent. The only way I can think of right now is a flat plate with a thickness to chord ratio of around 0.05%. However, this will require very fine meshing to capture the small thickness of the edges of the sail. Is there some best practice to model thin sails? |
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February 16, 2013, 08:34 |
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#3 |
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Bart A.
Join Date: Feb 2012
Posts: 45
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No, unfortunately not. I'm still hoping someone here might know how to model this.
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February 16, 2013, 13:42 |
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#4 |
Super Moderator
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
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if what you want is a really really thin sail then you are talking about surface. zero thickness. you can do that in every CAD program, go with designmodeler.
create points or edges, then create a surface from those edges, for the surrounding fluid, you will have to create a body like a sphere or square around that surface. |
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February 16, 2013, 14:49 |
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#5 |
Member
Bart A.
Join Date: Feb 2012
Posts: 45
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And after that do I just proceed modelling as if I have a solid? So I would make an enclosure around the surface and then perform a boolean operation subtracting the surface from the enclosure body?
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February 16, 2013, 17:19 |
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#6 |
Member
Join Date: Sep 2012
Location: FL
Posts: 79
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make a surface of the sail in designmodeler. Draw an enclosure around it . Use boolean op to subtract the volume. Change the volume to fluid. Mesh and solve. BASIC STEPS.
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March 14, 2013, 08:57 |
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#7 |
Member
Bart A.
Join Date: Feb 2012
Posts: 45
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I have made a surface, drawn an enclosure around it but I could not perform a subtract boolean operation on the enclosure as this would create a non-manifold geometry. How do I subtract the zero-thickness sail from the volume? Or do I subtract it at all?
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March 14, 2013, 18:02 |
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#8 |
Senior Member
Stuart Buckingham
Join Date: May 2010
Location: United Kingdom
Posts: 267
Rep Power: 26 |
Bart,
If you are using Ansys DM, there is no need to do the boolean.Just select all the parts (fluid body and surfaces) in the object tree on the left side of the screen, right-click, and choose Form New Part. This approach allows you to have surfaces "floating" in a solid. Stu |
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May 31, 2013, 22:43 |
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#9 |
Senior Member
Brett
Join Date: May 2013
Posts: 212
Rep Power: 14 |
Hey guys
Does anyone know how to attach the base of a fin/sail to one side of the enclosure? ie cushion value = 0 Cheers Brett |
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June 2, 2013, 21:27 |
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#10 |
Senior Member
Stuart Buckingham
Join Date: May 2010
Location: United Kingdom
Posts: 267
Rep Power: 26 |
Brett,
Not sure what you mean, does your geometry have a thin wall attaching to a wall (like a baffle)? Stu |
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June 2, 2013, 22:43 |
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#11 |
Senior Member
Brett
Join Date: May 2013
Posts: 212
Rep Power: 14 |
Hey Stu,
im essentially wanting to join the base of a solid to one face of a flow enclosure. Does that make more sense? Brett |
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Tags |
geometry preparation, mesh generation, thin film |
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