[W-SE-98] Improved Durability for Automatic Mesh Generation

Contents
1. Introduction
2. Assessing the durability of an automatic mesh-generating feature
 2.1 Overall Assessment of the durability of an automatic mesh generation
 2.2 Assessment by cause for the failure of an automatic mesh generation
3. Summary
4. References

1. Introduction

In recent years, more and more complex shape such as coil-ends are modeled and detailed simulations are performed, and the use of CAD data as a model shape to be used in simulations is becoming inevitable. If a problem occurs in an automatic mesh generation in the workflow of simulations using CAD data, the work efficiency goes down significantly since it requires an investigation into the cause of a meshing failure, followed by the modification of automatic mesh generation settings, as well as in some cases the modification of CAD geometry. Therefore, there is a great demand for improving the durability of an automatic mesh generation.
JMAG has an automatic mesh-generating feature that automatically generates a mesh. We continue to carry out the Research and Development and improvements on an automatic mesh-generating feature to meet the needs of our customers. We are continually working to improve the durability of an automatic mesh-generating feature mentioned above as a key issue. Therefore, the durability of JMAG’s automatic mesh-generating feature is assessed in this white paper.

2. Assessing the durability of an automatic mesh-generating feature

This chapter presents the results of assessing the durability of an automatic mesh-generating feature. In the first half, we show the overall assessment results of the durability of an automatic mesh generation, and in the second half, we show the assessment results by cause for the failure of an automatic mesh generation.

2.1 Overall Assessment of the durability of an automatic mesh generation

First, we assess the durability of an automatic mesh-generating feature in JMAG-Designer from Ver. 15.0 to Ver. 18.0. We have prepared 774 testing data in order to evaluate the durability of an automatic mesh generation. Many of the testing data are those that were reported to have a failure of an automatic mesh generation in the past. Fig. 1 shows the change in success rate by feature.
Major improvements made in each version are as follows.

  • Before Ver. 15.0: Automatically eliminates interference between parts, improved accuracy for identifying contact surfaces, and automatically adjusts element size on curved surfaces
  • Ver. 15.0: Adding auto healing feature, improving cases having a slender surface, thin part, and microgap
  • Ver. 16.0: Improved quality for having an increased test coverage
  • Ver. 17.0: Improved durability for extruded mesh for models having a shape error
  • Ver. 18.0: Modified the handling method of NURBS surfaces, improved the search for “pairing surfaces” in periodic boundary surfaces, and improved cases having a small surface area.

The success rate has increased in all features as the version goes up, and it can be said that the durability has improved, albeit in a gradual manner. Depending on the improvements made in each of the above versions, the success rate of extruded mesh was improved by about 8% in Ver. 17.0, and the success rate of semi auto mesh and expanded slide and patch mesh features was improved in Ver. 18.0. Comparing by features, the success rate of expanded slide and patch mesh is slightly lower than that of other features, therefore the improvement is anticipated.

Example for the contact surfaces that have a slight mismatch in the external shap
Example for the contact surfaces that have a slight mismatch in the external shapes

Example of intersecting mesh occurring at several points on a curved surface
Example of intersecting mesh occurring at several points on a curved surface

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