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Inflation does not follow edge of airfoil

    • Manu19
      Subscriber

      Hello,


      i´ve already built a Model to simulate Drag and Lift of an Airfoil (Gö417A) at a chord-length of 90 mm. I´ve already separated the Mesh in three different regions.


      First is relatively coarse (Multizone with 10 mm Hexa-Mesh) and presents the most distant part in relation to the Airfoil.


      Second is a cylinder around the Airfoil (Body of Influence, Element Size 1 mm) and has a Diameter of 200 mm.


      The third part is represented by an inflation (First Layer height 0.15 mm, 12 Layers and a growth rate of 1.15)  and edge sizing (100 Divisions) of the 2 airfoil edges (upper and lower edge). 


      At the leading edge the Mesh does not follow the edge of the Airfoil and creates, in my opinion, a bad quality mesh. Furthermore the solution fails with a non-zero exit code of : 2. I don´t know if the mesh is the reason for the exit code, too.


      Does anyone have a solution to make the inflation follow the edge?


      Thank you for your help


       


       


       


       

    • Rob
      Ansys Employee

      Please post the image into the text: remember, staff aren't permitted to open/download attachments. 

    • Manu19
      Subscriber

       


    • Rob
      Ansys Employee

      That's impressive.  Suppress the edge sizing and use the curvature size function.  Are there any short edges in that region, and have you got all the edges in the inflation setting?

    • Manu19
      Subscriber

      The curvature size function helps until the inflation is unsuppressed




      Could it be that the imported Step-Model consists of too less X/Y Points? If the Inflation is suppressed it looks like this 



      And after unsuppressing there is a part of the inflation inside the airfoil



      I don´t know if it´s possible to change the inflation?


       

    • Rob
      Ansys Employee

      I really don't like the faceting you've got on the leading edge or the way the mesh size jumps just upstream of it.  If you click on the inflation, is the whole aerofoil perimeter highlighted?  How does the model look in the geometry tool? 


      As an aside, are you using the University licence? 

    • Keyur Kanade
      Ansys Employee

      i assume it is 2d.


      there may be small edges which are not selected during inflation settings. 


      select one edge and use 'extend to limits' to select more edges during inflation settings. 


      you can also use virtual topology to merge small edges. 


      if you do not have small edges then also you can use virtual topology. select only that single big edge and convert it to virtual topology. then use that edge in inflation settings. 


      you can search through community and help for virtual topology. 


      Regards,


      Keyur


       


      If this helps, please mark this post as 'Is Solution' to help others.


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    • Manu19
      Subscriber

      The mesh over the profile is going to be refined if the inflation works. The whole surface of the aerofoil is highlighted. What do you mean how it looks like in the geometry tool? The airfoil itself is imported via Step-model.


      You´re right. How did you notice? Because of the number of elements?

    • Keyur Kanade
      Ansys Employee

      geometry tools are Design Modeler and SpaceClaim. Please check how edges look into these tools. 


      Can you please explain what do you mean by 'You´re right. How did you notice? Because of the number of elements?' 


      which comments you are referring? 


      Regards,


      Keyur


       


      If this helps, please mark this post as 'Is Solution' to help others.


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    • Manu19
      Subscriber

      Good Morning Keyur,


      i think something went wrong. I wanted to reply to rwoolhou. Sorry. He asked me if i use the university licence for simulation. And 'You´re right. How did you notice? Because of the number of elements?' was the answer.


       


      The simulation is in 3D. But i think that your suggestion should help, too? The difference between 2D and 3D should only be that i have to choose the airfoil area (3D) instead of the edge (2D) in inflation? Please correct me if i´m wrong. I tried your suggestion but it did not help. I don´t know if i did something wrong?


      This is how the airfoil looks in Design Modeler. The Geometry should be OK?





       

    • Keyur Kanade
      Ansys Employee

      for better mesh please split the curved surface at the leading edge so that you get one upper surface and one lower surface. 


      for inflation please go throgh, 



      Regards,


      Keyur


       


      If this helps, please mark this post as 'Is Solution' to help others.


      Guidelines on the Student Community


      How to access ANSYS help links


       

    • Rob
      Ansys Employee

      I'm psychic! It helps when dealing with questions on here.   


      The geometry looks OK, use the edge select tool so see how many edges you have on the end of the aerofoil. I suspect you're missing a couple in the inflation definition. 

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