CAD Data Reuse for CAE

CADfix offers to CAE analysts the ability to automatically and interactively repair and transform CAD geometries prior to analysis. CADfix ensures that solid or surface models are robustly translated effectively into target systems. CADfix offers a full range of import and export functionality for pre-processing CAD data from native and neutral formats. Master Model Driven FEA, CFD, EM Solutions with ever shortening product design cycles, the emphasis on simulation tools to provide timely results to drive the design is greater than ever. This pressure dictates FEA, CFD and EM analysis being driven off the master model CAD data. CAD provides the geometry but a great deal of analysis time is still spent working with the geometry to prepare it for analysis. CADfix for Geometric Exchange is uniquely positioned in the CAD to CAE data flow with its ability to read and write multiple geometric formats, repair and heal poor quality geometry and de-feature and simplify complex geometric definition. In the end, CAE analysts are starting with much more robust geometric definitions for their analytical needs

Following a CAE simulation, it is often necessary to rework the CAD to adjust the CAD model based on the results of the analysis. This manual work can be time-consuming and often requires CAD models to approximate the results of the simulation or to be built from scratch by hand, with limited reuse of the original model geometry.

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Throughout the life-cycle of a product, designs can be worked on repeatedly by different engineers, sometimes by multiple departments and even by external companies. It is important to be able to quickly identify changes and inconsistencies between different CAD models and derived simulation mesh data throughout these engineering processes. CADfix provides three tools for the CAD, CAE, simulation, and advanced manufacturing sectors that will allow users to quickly and easily identify differences between CAD models and mesh data.

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merging geometry

CAE analysts must ensure that geometric data is ideally suited for specialist applications. CAE users constantly face CAD model issues that cause meshing failures and have a significant negative impact on analysis lead times including:

  • Overly complex, badly defined and corrupt geometry
  • CAD model features such as fillets, small holes, short edges, small faces and other modeling artifacts that are valid in CAD but negatively impact and constrain meshability
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Medial Object Technology

The Medial Object is constructed by rolling a disc around inside a face, or a sphere inside a volume. The locus of the center of the maximal diameter disc/sphere forms the Medial Object. The Medial Object also carries radius information, and is thus a complete representation of the original object.

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Geometric reasoning

Geometric Reasoning is accomplished based on the medial object of a solid which is a skeletal representation providing a comprehensive source of information for a variety of applications. Many engineering scenarios require more extensive geometric information than can currently be provided by typical CAD or Product Data Interoperability software products and this is the goal of Geometric Reasoning technology.

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In addition to the well-known data exchange and geometry repair tools, CADfix CAE (also named FAM - Field Analysis Modeller) provides capabilities for meshing, material and physical property definition, constraint and loading definition, and interfaces to analysis packages. Mesh control parameters, properties and boundary conditions are assigned to the CAD geometry, while full associativity and parentage is maintained with the resulting CAE mesh.  This is packaged within the highly customisable CADfix CAE graphical user interface and analysis framework with an extensive API.

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Defeaturing CAD model with CADfix

Preparing CAD models for successful mesh generation continues to be a crucial part of the design to analysis process. A common problem in CAD models is features that are very small compared to the desired mesh size. Small features exist for a variety of reasons and can require an excessive amount of elements or inhibit mesh generation all together.

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