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Change mesh type

- October 21, 2019 at 8:05 am
  
  DineshKanesan123
  Subscriber
  
  Hi, would like to ask on how to change the mesh type from Type 1 (Fig1) to Type 2 (Fig2).
- October 21, 2019 at 2:36 pm
  
  Rob
  Forum Moderator
  
  Type 1 looks like you've used the "hex-dominant" mesh method which is a really bad idea for CFD. This differs from a hex dominant (ie all hex) mesh formed from sweep or similar. Type 2 is referred to as an O-grid or butterfly mesh and isn't used much anymore as sweep and pave are much more time efficient.
- October 30, 2019 at 12:43 am
  
  DineshKanesan123
  Subscriber
  
  Thanks alot
- November 6, 2019 at 8:53 am
  
  DineshKanesan123
  Subscriber
  
  Could you please guide me on how to generate the O-grid mesh? Is the generated in the attached figure correct?
- November 6, 2019 at 8:54 am
  
  DineshKanesan123
  Subscriber
  
  Could you please guide me on how to generate the O-grid mesh? Is the generated in the attached figure correct?
- November 6, 2019 at 10:59 am
  
  peteroznewman
  Subscriber
  
  It's not available in ANSYS meshing or Fluent meshing. It might still be in ICEM meshing, but I don't know.
  
  As was mentioned above, O-grid mesh doesn't provide the best solution quality relative to other mesh shapes. Solutions should be mesh independent. When that is true, it doesn't matter what shape the mesh is.
  
  If you want to persist, then for ANSYS meshing, you have to slice up the geometry to make the 5 pieces of solid to mesh separately, the center "square" and the four outer pieces with the circular arcs and straight radial lines.
- November 7, 2019 at 3:53 am
  
  DineshKanesan123
  Subscriber
  
  Thanks for the response. What mesh type provides the best solution quality for capturing erosion in pipes (near wall treatment) ?
- November 7, 2019 at 2:20 pm
  
  peteroznewman
  Subscriber
  
  In ANSYS meshing, use a mesh control called Inflation to put many thin elements near the wall. Your pipe should be a sweepable body, so use a mesh method of Sweep. Pick the end face as the source of the sweep and add a Sizing mesh control on the circular edge of that face to set the element size. Also, on the Mesh Details window, type an element size to limit how large the elements can get at the center of the pipe. In Mesh Details, you can turn on Element Quality and plot various element quality metrics.
  
  I don't know as much about Fluent meshing, but that has similar capabilities.

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