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HELLO GUYS, NEED URGENT HELP WITH THICKENING A CAR MODEL, CFD PROJECT

Question asked by Majd Al Hyder on Nov 10, 2017
Latest reply on Nov 25, 2017 by J. Mather

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Hello, My second question on the forums and i hope to use the advantage of your experience,

i'm working on the CAMARO tutorial ( the one from 2010 ) to use it for a CFD analysis of drag and pressure loads at high speeds,

i'm at around 85% done with the model where i tried to run the simulation and after nearly 4 hours i realized that simulations don't work on surfaces, so i tried to thicken the model after applying knit surface, and started getting all sorts of messages that it won't work,

any advice would be greatly appreciated,

Thank you

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Iain McEwen Nov 15, 2017 12:31 PM
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Hi Majd,

Do you have the model?
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- Majd Al Hyder @ Iain McEwen on Nov 16, 2017 6:16 AM
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  Hi, Yes I do, and it's almost complete, i intend to build the car totally, as far as i can go with the modeling and as much data it generates, and the aerodynamic simulation is essential, hope to get help with advice on that too, cuz the model is 1:2 scale, so it's half the size. even when i did the simulation and solid works didn't see the shell because it's a surface it took nearly six hours, so any advice on that too i'd appreciate it.
  
  Body REBUILD.SLDPRT - Google Drive
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  - Iain McEwen @ Majd Al Hyder on Nov 16, 2017 7:41 AM
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    Hi Majd,
    
    If you increase the tolerance on your knit, you'll see that some gaps are larger than is possible to knit. If you improve the fit of the surfaces with each other, then you'll be able to knit and thicken. Please see images below for some of those larger gaps I found in the model.
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    - Majd Al Hyder @ Iain McEwen on Nov 25, 2017 7:04 AM
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      Thank you very much for your help, i'm using knit surface to try and look were it is necessary to modify, because i already did a rebuild once, if you have any advice on improving the work flow and or what can help me edit such models without needing to go over the whole thing, i'd appreciate it, thanks again
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  - J. Mather @ Majd Al Hyder on Nov 16, 2017 7:51 AM
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    Majd Al Hyder wrote:
    ...the model is 1:2 scale, so it's half the size.
    Unless you are going to attempt to verify the CFD with a real half scale model in a real wind tunnel, I would have modeled at 1:1 scale.
    I would model as a monolithic solid rather than worry about sheet metal thickness for the purpose of CFD.
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    - Majd Al Hyder @ J. Mather on Nov 25, 2017 7:07 AM
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      thank you for the input sir,
      excuse me if i didn't understand correctly, hence i mentioned that it took nearly 6 hours to model the space containing the model ( because of the mistake of not thickening the surface ), how is modeling a full scale model is going to help me do this ?
      
      also, any advice on how to reach the final goal of applying an aeroanalysis on the model would be appreciated,
      
      thank you again
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      - J. Mather @ Majd Al Hyder on Nov 25, 2017 8:26 AM
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        I recommend that you start with an easier project gaining experience working your way up to a complex problem like this.
        Is this a school assignment? If so, did you instructor approve this project?
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HELLO GUYS, NEED URGENT HELP WITH THICKENING A CAR MODEL, CFD PROJECT

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