Advanced CFD Meshing of a Turbocharger using ANSA

Objective: To mesh the given turbocharger model using the ANSA tools taught in the lecture.

Procedure:

  • Open the given model in ANSA software.

  • Now select PID in drawmode.

  • Now in quality criteria, go to presentation parameters and checkmark on "Draw CONS in PID, MID,.....mode like in ENT mode" option, then drag the bar to all details in "Detail on Demand effects" and apply.

Tools Used:

Topo mode:

As shown in the video

  1. Faces>Delete the unwanted part.
  2. Surfaces>New is used to fill the open spaces by selecting the lines.
  3. Cons>Fill hole is used to fill the holes, it selects the boundaries automatically.
  4. Faces>Intersect is used to perform boolean operation i.e., separate the connections of connected parts.
  5. Hot points>Parametric>>direction>0.5 to cover the turbo casing

  • As explained in the video we make the blades stage 1 & 2 along with the impeller and shaft rotor as one volume.
  • We remove the interfaces or the overlapping of surfaces.
  • Coons>Project, we get triple con. Now we delete the surface near triple con and we get required double con.
  • We also create inlet and outlet covers for compressor and turbo casings.

  • Now go to Faces-Set PID, select the faces and middle-click, and create properties.

Surface Mesh:

  • Now go to mesh option.

Mesh mode:

  • Go to perimeters>length>perimeters, select the model and middle-click on the mouse button, and assign different element mesh size length for different parts - click on ok.

   

  • Now go to mesh generation>free mesh, select mesh type as tria, reconstruct and select the required part of the model and middle-click on the mouse button.

  • Mesh is generated.

 

 

 

 

  • Now there are few changes made to the meshed model.
  • Topo>Macros>Cut, to create a patch so that the mesh is more evenly spread.

  • At some locations, the shaft rotor mesh doesn't align with the compressor casing mesh and turbo casing mesh.
  • The changes are made and the final perfect mesh is generated.

Volumetric mesh:

V-mesh mode:

  • After all the surfaces are meshed we go to the V-mesh option.
  • Volumes>Define, select the model and OK. It shows all the possible volumes that can be made.

  • Now delete all the unwanted volumes.

  • Now go to Unstructured Mesh>Tetra CFD, select all and confirm.

  • Now this will take 25-30min to generate the volumetric mesh.

  • The mesh is cut to check whether the volumetric mesh is generated properly.

Result and Conclusion:

Geometry clean up and meshing was done successfully,

  • In Topo mode, all the errors were removed and all the surfaces are properly generated.
  • In the mesh mode, the tria mesh was generated as mentioned and the corrections were made.
  • After all the surfaces are meshed we use the V-mesh mode to generate Tetra CFD volumetric mesh.

Thus, we have generated volumetric mesh on the given turbocharger model successfully using the ANSA.

 

 


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