Page 705 - 02. Subyek Computer Aided Design - Beginner’s Guide to SOLIDWORKS 2019- Level 1 by Alejandro Reyes
P. 705
Beginner's Guide to SOLIDWORKS 2019- Level I
) For larger, more complex models there would be a noticeable difference in
computing time. SOLIDWORKS Simulation Professional offers many more
options and the ability to analyze entire assemblies; with multiple
components, a smaller mesh size will most definitively impact the solution time.
If needed, the element size or the mesh density can be changed. Select
"Change settings," then "Change mesh density." Under "Mesh Parameters" we can
set the global element size and tolerance or move the mesh density slider to make
it coarse or fine. For this example, we'll use the default mesh settings. Click OK to
continue.
Mesh density determines the precision of the
solution. The default setting should provide an
accurate deformation solution and a reasonably
Mesh
accurate stress distribution. A finer mesh
improves stress results in local areas, but can ~ X
make the simulation take considerably longer
to run. Examples
Mesh Density
Consider rerunning the simulation with a finer
mesh if the results indicate that the stress is '
close to Coarse Fine
L Reset ~
0 Mesh Parameters
~ Continue
~ 0.14155235in
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ABOUT REDUCING MESH SIZE: Making the mesh size smaller improves
results accuracy up to a certain degree, but there comes a point where
reducing the element's size will not significantly improve accuracy in
sequential solutions; this is called convergence and is measured in percentage of
change from one solution to the next. For example, if the highest stress value is
within a certain percentage of the previous study, for example 2°/o-5°/o difference,
we can say that we have reached convergence and assume our results are valid.
To consider reducing the mesh size and look for convergence, our analysis
results MUST be below the yield stress and preferably show no stress
concentrations. After these conditions are met, we can re-run the analysis reducing
the mesh size a little at a time (1 0°/o reduction is a good starting point).
Convergence values depend on the accuracy needed and can vary around 2°/o to
5°/o or even higher. If these values seem high and/or your design has a low factor
of safety you may want to consider analyzing your design with a dedicated analysis
package to simulate real world conditions and improve the accuracy of your
analysis to be safe.
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