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Cad 1.011/14/2023 ![]() This can be done without causing a noticeable change to the surrounding faces, which is usually a lot easier than figuring out how to construct a larger face to cover a gap. Many of the geometric features that we would like to remove are small enough that they can be deleted by collapsing them into a point or line segment. There is, of course, always the possibility of manually deleting faces and drawing a new geometry to cover the gaps. When using the defeaturing tools in COMSOL Multiphysics, gaps are automatically covered as part of the operation (e.g., extending adjacent faces over the gap). This gap needs to be covered by a replacement surface so that we can restore a solid object, allowing us to create a volume mesh. When we remove these features, a considerably sized gap, or “wound”, will remain. However, they can be deleted from the geometry depending on the scope of the analysis. In most cases, details such as fillets, chamfers, holes, and fasteners are important for a product’s functionality. How the Size of Geometric Details Affects the Analysis To understand the tools available for the repair and defeaturing of a geometry, it helps to factor in the size and nature of the removed details. We often face situations where some components need simplification (also referred to as defeaturing), more detail, or repair before generating the mesh. Depending on how the bolt is represented in the CAD files, you would need to either simplify its geometry or add details to it in order to run the simulation. ![]() In the first scenario, a detailed representation of the bolt thread is important, while in the second scenario, a simple cylinder that fills the bolt holes would suffice. A good understanding of the scope of the study and the involved physics greatly helps in determining the most efficient path to an analysis’ appropriate geometry.įor instance, to receive a detailed analysis of a bolt thread’s load-carrying capacity, you would use a geometric representation of the bolt that differs from the one you’d use for a heat conduction simulation in a large assembly that contains many bolted connections. Various types of analyses require widely different representations of the same design.īefore starting a COMSOL Multiphysics model, it is important to determine the level of detail necessary to obtain desired results. Using Different Representations of the Same Design ![]() In this scenario, we would need to rely on either automatic repair during the import process or use the provided repair tools, which are described in further detail below. ![]() However, due to the complexity of the design and/or repeated translations from one CAD format to another, data can sometimes be lost or inaccurate, which can result in incomplete surfaces with gaps. Usually, this is something we don’t need to worry about, because the imported geometric data contains the 3D solid object and the mesh is automatically created. This is especially true for finite element analysis, as it typically requires a very-high-quality 3D geometry.įor example, to create a volume mesh for a component, we would need a watertight surface geometry that can be made into a solid with an interior region. ![]() It can be a challenging task to use the same 3D data set for the various stages in a product’s life cycle. With the elimination of 2D drawings, 3D CAD models are a product’s sole information source, which forces these models to streamline even more processes in a product’s life cycle. Some organizations have gravitated toward completely eliminating the production and distribution of traditional 2D drawings. Today, 3D CAD models can be found in a wide range of documents and applications, spanning from service manuals to analyses. CAD designs have played an important role in a product’s life cycle over the years. Later on, designers started to generate 3D models based on 2D drawings. For most companies, the original motivation behind adopting CAD software was to automate a product’s design, documentation, and manufacturing process in order to clearly and effectively communicate engineers’ designs to production facilities.īefore 3D CAD models, products were created from 2D designs that came in the form of 2D drawings. Let’s discuss how these tools work and when to apply them.Ĭomputer-aided design (CAD) has a long history that almost dates back to the very first electronic computers. They are powerful additions to the geometric modeling capabilities of the COMSOL Multiphysics® software. The CAD Import Module, Design Module, and the LiveLink™ products for CAD include tools for repairing and preparing a geometry for simulation. ![]()
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