ANSYS-AUTODYN Basics

Structured and Unstructured Parts (Meshes)

An AUTODYN Part can use a Structured mesh or an Unstructured mesh

–Structured meshes can be generated in AUTODYN

Use (I,J,K) index space

–Unstructured meshes must be imported (e.g. from Workbench)

Lagrange Parts (Solid, Shell, Beam)

–Can be Structured or Unstructured

–Unstructured Parts are solved more efficiently (speed and memory)

A Structured Part can be converted to an Unstructured Part prior to solving

–Lagrange Parts (structured or unstructured) can be used to “fill” regions of Euler and SPH Parts

Euler and ALE Parts

–Always Structured

–Euler meshes are usually rectilinear

Structured Parts - Index Space

Each Structured Part in AUTODYN has a defined index space (i,j) in 2D or (i,j,k) in 3D, where i, j and k are integer values ranging from 1 to Ni, Nj, Nk

-This index space is always rectangular

Structured Parts - Physical Space

Each Structured Part is also defined in a physical xyz-space, where x, y and z are real values

–The mesh can have a general shape in physical space

Structured Parts – Unused Elements

Not all elements defined in the index space need to be defined in physical space

–Elements not assigned a material are Unused

–Allows complicated geometries to be meshed

Creating Structured Parts

Part Wizard allows automatic generation of quality structured Parts for predefined (Predef) geometries

–2D Volume

Box, Quad, Circle, Ogive, Rhombus, Triangle, Wedge

–3D Volume

Box, Hex, Cylinder, Sphere, Ogive, Fragments/Bricks

–Shells

Plate, Cylinder

Manually build quality structured meshes

–Nodes

–Lines

–Surfaces

–Volumes

Import Structured Meshes

–ICEM-CFD

–TrueGrid

Part Wizard

Part Wizard generates a Part in three steps

–Define a Predef geometry

–Define the zoning

–Fill the whole Part

Part Wizard – 2D Box Predef

Part Wizard – 2D Circle Predef

Part Wizard – 2D Predefs

Part Wizard – 3D Box Predef

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