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Flowsim Help: Typical Issue with surface body and geometry

Question asked by Karim Alame on Feb 26, 2013
Latest reply on Mar 1, 2013 by Karim Alame

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Hi everyone,

I hope I'm not repeating the same issue everyone has been asking but here it goes. I looked around and saw people asking about flowsim and surfaces and I noticed that the solution to that would either knit the surfaces or add thickness such as shelling or so. I'm trying to run a 3D simulation(Ihave already done the 2D for this body). So it meshes fine but once I hit run it gives me this error :

"There is no fluid volume in the project. Please check geometry or boundary conditions."

This is an external flow obviously and I'm following the typical tutorial presented on flow over a sphere in 3D which doesn't specify boundary conditions. Also my global goals are set for force in y-direction along with the velocities in both directions.

Any suggestions ? Thanks in advance!

Jared Conway Feb 28, 2013 1:57 PM

Correct Answer

knit them together

add a planar surface at the middle/symmetry plane

knit those together and form a solid

mirror the body

once you do that, you should be good to run a flow over it

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Jared Conway Feb 27, 2013 11:33 AM

is the part hollow?

can you delete the surface body and merge the rest of your bodies together?

what settings do you have for internal volumes and volumes without flow conditions?

also, do your initial conditions include a flow velocity?

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Karim Alame @ Jared Conway on Feb 27, 2013 6:56 PM

Hi Jared,

yes the part is hollow.

I don't quite understand what you meant with "can you delete the surface body and merge the rest of your bodies together" I mean I have 5 stations with cross sections drawn in them. I connected those using surfaces, which I knitted then ceated some thickness to.

I don't have anything set for the internal volumes and volumes without flow conditions. Could this be the problem ? I based this off of the external flow over a sphere example(they don't set anything for the above mentioned) although I can see a problem there since the sphere is a solid body and isn't hollow on the inside.

My initial conditions are set for a velocity of 10 m/s.

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Jared Conway @ Karim Alame on Feb 28, 2013 12:37 PM

hi karim, i'm suggesting to eliminate geometry that isn't important or that might be causing an issue

in the surface bodies folder, rightclick on the surface and choose "delete" to delete the body

use insert > feature > combine to combine all the solid bodies together. ideally i'd suggest filling in the hollow part with solid to see if that helps.

i'd also suggest a CTRL-Q with verification on rebuild enabled to make sure your geometry is good.

just to make sure your flow problem is setup correctly, something you might want to try is delete your solid body(ies) and then replace with just a solid sphere or block. that will confirm that your model is the issue.

if you want to upload your model, i can look deeper.

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Karim Alame @ Jared Conway on Mar 1, 2013 10:32 PM

Okay I'm going to upload the part, it's a little different from what I originally posted in the picture since I went back and tried to mess with it last night but never got to finish it. All I did was get rid of the boundary suraces and use lofts instead. How can I fill the hollow part with solids? I have a feeling that would take care of my problem.

Please find the part attached. Thank you for your time!

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Jared Conway @ Karim Alame on Feb 28, 2013 1:57 PM

knit them together

add a planar surface at the middle/symmetry plane

knit those together and form a solid

mirror the body

once you do that, you should be good to run a flow over it

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Karim Alame @ Jared Conway on Mar 1, 2013 10:32 PM

That worked perfectly. Thanks for your help!

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6 Replies

Jared Conway Feb 27, 2013 11:33 AM
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Correct Answer
is the part hollow?

can you delete the surface body and merge the rest of your bodies together?

what settings do you have for internal volumes and volumes without flow conditions?

also, do your initial conditions include a flow velocity?
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- Karim Alame @ Jared Conway on Feb 27, 2013 6:56 PM
  Mark Correct
  Correct Answer
  Hi Jared,
  yes the part is hollow.
  
  I don't quite understand what you meant with "can you delete the surface body and merge the rest of your bodies together" I mean I have 5 stations with cross sections drawn in them. I connected those using surfaces, which I knitted then ceated some thickness to.
  
  I don't have anything set for the internal volumes and volumes without flow conditions. Could this be the problem ? I based this off of the external flow over a sphere example(they don't set anything for the above mentioned) although I can see a problem there since the sphere is a solid body and isn't hollow on the inside.
  
  My initial conditions are set for a velocity of 10 m/s.
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  - Jared Conway @ Karim Alame on Feb 28, 2013 12:37 PM
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    Correct Answer
    hi karim, i'm suggesting to eliminate geometry that isn't important or that might be causing an issue
    in the surface bodies folder, rightclick on the surface and choose "delete" to delete the body
    use insert > feature > combine to combine all the solid bodies together. ideally i'd suggest filling in the hollow part with solid to see if that helps.
    i'd also suggest a CTRL-Q with verification on rebuild enabled to make sure your geometry is good.
    
    just to make sure your flow problem is setup correctly, something you might want to try is delete your solid body(ies) and then replace with just a solid sphere or block. that will confirm that your model is the issue.
    
    if you want to upload your model, i can look deeper.
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    - Karim Alame @ Jared Conway on Mar 1, 2013 10:32 PM
      Mark Correct
      Correct Answer
      Okay I'm going to upload the part, it's a little different from what I originally posted in the picture since I went back and tried to mess with it last night but never got to finish it. All I did was get rid of the boundary suraces and use lofts instead. How can I fill the hollow part with solids? I have a feeling that would take care of my problem.
      
      Please find the part attached. Thank you for your time!
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      - Jared Conway @ Karim Alame on Feb 28, 2013 1:57 PM
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        Correct Answer
        knit them together
        add a planar surface at the middle/symmetry plane
        knit those together and form a solid
        mirror the body
        
        once you do that, you should be good to run a flow over it
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        Karim Alame @ Jared Conway on Mar 1, 2013 10:32 PM
        Mark Correct
        Correct Answer
        That worked perfectly. Thanks for your help!
        Like • Show 0 Likes0
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Flowsim Help: Typical Issue with surface body and geometry

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