ANSYS Explicit Dynamics Explicit Dynamics: Meshing

Uniform element size (in finest zoned regions)
– Smallest element size controls the time step used to advance the
solution in time
– Explicit analyses compute dynamic stress waves that propagate
throughout the entire mesh
• Element size controlled by the user throughout the mesh
– Not automatically dependent on geometry
• Implicit analyses usually have static region of stress concentration where
mesh is refined (strongly dependent on geometry)
• In explicit analyses, the location of regions of high stress constantly change
as stress waves propagate through the mesh
– Mesh refinement is usually used to improve efficiency
• Mesh transitions should be smooth for maximum accuracy
• Hex-dominant meshing preferred
– More efficient
– Sometimes more accurate for slower transients

Tetrahedrons
–
Advantages
•An arbitrary volume can always be filled
with tetrahedra
•Can be generated quickly, automatically,
and for complicated geometry
–
Disadvantages
•Element and node counts are higher than
for a hex mesh with a similar mesh density
•Generally not possible to align the cells
with a flow direction
•Not well suited for thin solids or annuli due
to non-isotropy of geometry and nature of
element

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