ANSA Tutorial – SURFACE WRAPPING WATERTIGHT PREPARATION

CASE: SUSPENSION

The wrapping tool in ANSA can be used to quickly create a watertight (closed volume) surface
mesh from an assembly. The individual parts of the assembly may consist of geometry data, mesh
only CAD data, or even a combination of both. Mesh-only data are parts exported in formats such
as stl, vrml, etc., or legacy models exported in solver specific formats, such as NASTRAN (.nas,
.dat), DYNA (.key), FLUENT (.msh), STAR-CD (.inp) etc., that lack geometry information.
The advantage of Wrapping is that it saves considerable amount of modeling time in the creation of
watertight surface mesh, compared with traditional techniques that employ a series of steps. The
traditional steps include:
isolation of relevant geometry from detailed design data;
treatment of design and translation related issues such as cracks, holes, gaps etc.;
and topological connection between intersecting parts that are often tedious and time
consuming.
The example model for this workshop is a suspension exported in .stl format. This means that the
model contains only Mesh (FE-Model) and no geometry. This tutorial presents in detail all the steps
needed to create a watertight model of good quality by keeping all the important features of the
initial FE Model.
The steps described in this tutorial are the following:
Read the .stl file containing the mesh of the suspension
Close any gaps before wrapping
Wrap the whole model to take the outer description
Check the quality of the resulting mesh
Fix any problematic areas of the model.

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