WB 11 0 Intro 2nd Training

WB 11 0 Intro 2nd Training

Appendix 3 General Preprocessing

… Global Mesh Controls (ANSYS)

  • Comparisons of meshing in Simulation and ANSYS:

    • Global “Element Size” is similar to ESIZE
    • The “Curv/Proximity” setting in Simulation is somewhat similar to SMRTSIZE meshing in ANSYS
      • Both consider curvature and proximity of curves
      • Meshing behavior produces different results, however, so these two settings are not exactly the same
    • The “Shape Checking” toggle is SHPP,LSTET,ON
      • Use of Jacobian tests at integration points is the “Standard” or SHPP,LSTET,ON method, suitable for linear analyses
      • Use of Jacobian tests at corner nodes is the “Aggressive” or SHPP,LSTET,OFF method. This is generally a more conservative approach and may be preferred for nonlinear analyses. This is because elements which undergo distortion during solution should have a good quality shape to begin with.
      • Because Simulation uses its own criteria for shape tests, SHPP,OFF is set when exporting a mesh to ANSYS.

… Local Mesh Controls (ANSYS)

  • Internally, the following is used:

    • “Part Relevance” is similar to changing SMRTSIZE settings prior to meshing specific volumes (bodies)
    • “Sizing” with “Element Size” or “Number of Element Divisions” is similar to LESIZE and AESIZE. The “Sphere of Influence” option is not present in ANSYS.
    • “Contact Sizing” is not directly available in ANSYS but is analogous to setting AESIZE on surfaces which comprise contact regions prior to meshing
    • “Refinement” is similar to KREFINE, LREFINE, AREFINE

… Element Shape Options (ANSYS)

  • Internally, the following is used:

    • “Mapped Face Meshing” is similar to MSHKEY,1 with appropriate MSHAPE setting
    • “Element Shape” is similar to using VMESH (free) or VSWEEP.
    • “Part Proximity” is somewhat similar to SMRTSIZE
    • Hex-dominant meshing capabilities are not present in ANSYS.
      • Note that some lower-order element types (e.g., SOLID45) do not support pyramid shape. If hex-to-tet transitions (multibody parts) or the hex-dominant meshing (Adv. Struct. Meshing Module) is used, do not set to lower-order elements in “Meshing” branch
      • Workbench users can import the Simulation mesh to FE Modeler to see the number of degenerate elements present before importing to ANSYS.

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