Community Computational Fluid Dynamics AutoMesh IGG connecting multiple blocks to a common interface for...

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IGG connecting multiple blocks to a common interface for Volute meshing

JosephSmith

Hi everyone! I am a beginner attempting to mesh a volute in IGG. The cad is seen in image 1. I have also split the CADs surfaces further to attempt to make the blocking process easier

 

Image 2 below shows an upclose region near the cutwater. At this section, it seemed appropriate to split the mesh into two parts: A and B, extrude them separately and then set full non matching boundary conditions on the patch where they have a common interface. 

I tried to extrude the portion of the face B seen below in image 3.

The portion A of the face was then extruded separately in image 4:

The two extrusions next to each other are in image 5:

The last image is my attempt at first trying to split the circular extruded section A into a patch near the common interface of B. Then setting the two patches between A & B's extrusion  to full non matching.

I would like to know if the above process may be incorrect, or if there is a more suitable way of approaching this problem. 
I have tried to use methods from the IGG tut 3&4 to tackle the problem but would appreciate a second opinion.

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  • +1

    Hi Joseph, 
    Based on these images I am wondering whether the patches on the two sides of the full non-matching connection are on a common surface at the location where they should be connected? I suspect that using the extrusion method that is not the case. When computing the full non-matching connection you'll probably see both sides will be treated as a solid wall. Or the space in between the patches is so small that it will treat it as a full non-matching connection but it introduces errors. 

    Best regards,
    Colinda

  • 0 in reply to Colinda

    Hi Colinda,

    Thanks for the reply. You were right! Using the extrusion is this manner does not guarantee a common touching surface and renders the method incorrect. I'd been trying a different approach since the initial post: I inserted a block at the cutwater region, seen outlined in red in image 1, and created three internal faces. This resulted in four regions marked 1,2,3 and 4 below. I then changed the limits of the extrusion to cover only the orange face of block four, in a similar manner to the volute tut. This allowed me extrude only that face or orange patch of region 4. Going clockwise, I then extruded the consecutive blocks

     

    When I neared the cutwater after going around, I extruded the face that covers region 1,2,3&4 from the relevant side(seen in blue): 

    I then selected the two faces which touch each other, and set them to full non matching:

    Only the outlet tube remained. I think I divided the patch on region 1,2,3,4 in the Patch selector menu to create a patch for only the circular region 1. Then I selected that patch and extruded it:

    The final mesh is seen below:

    I am still trying to resolve orthogonality issues around the fillets but thats my progress so far

Reply
  • 0 in reply to Colinda

    Hi Colinda,

    Thanks for the reply. You were right! Using the extrusion is this manner does not guarantee a common touching surface and renders the method incorrect. I'd been trying a different approach since the initial post: I inserted a block at the cutwater region, seen outlined in red in image 1, and created three internal faces. This resulted in four regions marked 1,2,3 and 4 below. I then changed the limits of the extrusion to cover only the orange face of block four, in a similar manner to the volute tut. This allowed me extrude only that face or orange patch of region 4. Going clockwise, I then extruded the consecutive blocks

     

    When I neared the cutwater after going around, I extruded the face that covers region 1,2,3&4 from the relevant side(seen in blue): 

    I then selected the two faces which touch each other, and set them to full non matching:

    Only the outlet tube remained. I think I divided the patch on region 1,2,3,4 in the Patch selector menu to create a patch for only the circular region 1. Then I selected that patch and extruded it:

    The final mesh is seen below:

    I am still trying to resolve orthogonality issues around the fillets but thats my progress so far

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