Geometry Creation In Comsol Multiphysics
There are four main ways you can generate the geometry for your simulation in COMSOL Multiphysics:
Each of these means of geometry creation provides different opportunities and advantages. The first method enables you to generate your geometry using only the COMSOL Multiphysics modeling environment. This method is the focus of todays blog post, as we will discuss its associated workflow.
The general steps for creating a geometry include:
Sometimes, it can be more efficient to create geometry primitives in lower dimensions using work planes and then extend them into the dimension that was not initially considered. Work planes can also be used to define cross sections from a higher dimensional entity to a lower dimensional workspace.
Lets now dive further into the details of using geometry primitives, geometry operations, and work plane operations. Note that these operations can be used for geometries native to COMSOL Multiphysics as well as those created through another CAD program.
Geometry Creation And Import With Comsol Multiphysics Layla S Mayboudi Resource Informationthe Item Geometry Creation And Import With Comsol Multiphysics Layla S Mayboudi Represents A Specific Individual Material Embodiment Of A Distinct Intellectual Or Artistic Creation Found In Bowdoin College Librarythis Item Is Available To Borrow From 1 Library Branch
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 COMSOL Multiphysics Geometry : Creation and Import
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Creating A Model Geometry In Comsol Multiphysics
Creating the geometry for your model is one of the first steps of setting up a simulation. In the COMSOL Multiphysics® software, there are many geometry operations, tools, and functionality that enable you to do this. These include geometric primitives Boolean, partition, and transformation operations work plane operations and other CAD tools. Here, we highlight all of this functionality and, near the end, link to a video tutorial series that shows how to use them while building your model geometry.
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Create Geometry From An Imported Mesh
Importing meshes into COMSOL Multiphysics is often necessary when interfacing between different programs. With COMSOL Multiphysics version 5.0, these meshes can be converted into solid geometry objects for further investigation and modeling capabilities. You can also perform boolean operations on the new geometry for CFD, electromagetics, and acoustics applications.
Geometry Creation And Import With Comsol Multiphysics
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This book focuses on the geometrycreation techniques for use in finite element analysis. Examples are providedas a sequence of fin designs with progressively increasing complexity. A finwas selected as it is a feature widely employed for thermal management. As thecontent progresses, the reader learns to create or import a geometry into a FEMtool using COMSOL Multiphysics®. The fundamentalsmay also be applied to other commercial packages such as ANSYS® or AbaqusTM. The content can be utilized ina variety of engineering disciplines including mechanical, aerospace,biomedical, chemical, civil, and electrical. The book provides an overview ofthe tools available to create and interact with the geometry. It also takes abroader look on the world of geometry, showing how geometry is a fundamentalpart of nature and how it is interconnected with the world around us.
Features:
COMSOL Multiphysics® ApplicationBuilder.
1: Introduction
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The Geometry In The Simulation Process
Creating or importing a geometry is usually the first step in the COMSOL Multiphysics modeling process. Depending on the goal of our simulation, the geometry can be either a realistic or an idealized representation of a device.
There are various ways to build a geometry. For example, we can draw shapes on a work plane and extrude them, or we can create a solid object and combine it with other solid objects to obtain a final shape. On some occasions, the device we are drawing consists of several parts. To be able to apply different material settings, we would need to draw these parts as separate solid objects.
Imported geometry from a CAD file, for example, often needs repair or simplification by removing small, or otherwise unnecessary, details. In the COMSOL® software, we can draw new shapes to complement imported objects. Regardless of how we create the geometry, we can always go back and edit the various operations .
After we create the geometry, we can proceed to define the physics, include material and boundary settings, and then mesh the geometry. If necessary, we can go back to modify the design, in which case the physics settings are retained on the domains and boundaries we have originally selected. Before solving, we create the finite element mesh, which should provide an adequate approximation of the geometry. Finally, we evaluate the results of the simulation by plotting them on the geometry.
Advantages Of The Create Geometry From Mesh Feature
There are multiple options for importing meshes into COMSOL Multiphysics software for users that interface with specialized mesh programs. The mesh formats supported by COMSOL software include NASTRAN® Bulk Data, VRML v1, and STL. Building upon this practice, users of COMSOL Multiphysics version 5.0 now have the option to do more with these imported meshes.
The Create Geometry from Mesh feature adds an additional Component to your model with the geometry included, created from the imported mesh. With this new feature, you can create a surrounding domain around this geometry, as shown in the video further down the page. After creating this separate domain, perform boolean operations such as Difference, Intersection, and Union. If the original geometry is to be meshed as well, the new Copy feature for meshes comes in handy. No need to remesh the original geometry simply copy the mesh from the original Component into the new one.
Note that, for the time being, this can only be done when there are no intersections between the geometry objects.
Here is a short list of the possible applications and associated physical phenomena involved:
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Selecting The Geometric Kernel
When we install COMSOL Multiphysics® with a license that includes the CAD Import Module, Design Module, or one of the LiveLink products for CAD, the Parasolid® kernel is set to default when starting a new model. However, we can easily change this setting in the Preferences window.
To check and change the geometric kernel in a model component after we have started modeling, we can click the Geometry node in the Model Builder to navigate to the Settings window for Geometry.
By changing the Geometry representation in the settings, we can control which kernel handles the geometry in the current model component. Changing the kernel requires a rebuild of the geometry sequence by using the kernel we have switched to. When we switch kernels in a model that already contains solutions, we can avoid resolving the model by clicking the Update Solution button on the Study toolbar to map the solutions to the rebuilt geometry.
The geometry sequence cannot be rebuilt using the COMSOL kernel if it includes any operations that are only available with the CAD kernel. These operations include those that appear under Defeaturing and Repair in the Geometry toolbar the Import feature and the Loft, Midsurface, Thicken, Chamfer, and Fillet operations included with the Design Module. In these situations, we can convert the geometry objects to be used with the COMSOL® kernel, as discussed below.
Geometry Creation And Import With Comsol Multiphysics Layla S Mayboudiresource Informationthe Item Geometry Creation And Import With Comsol Multiphysics Layla S Mayboudi Represents A Specific Individual Material Embodiment Of A Distinct Intellectual Or Artistic Creation Found In University Of San Diego Librariesthis Item Is Available To Borrow From 1 Library Branch
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 Geometry creation and import with COMSOL Multiphysics
 Title
 Geometry creation and import with COMSOL Multiphysics
 Statement of responsibility
 Includes bibliographical references and index
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 1 online resource
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 Note
 Electronic reproduction. Ann Arbor, MI : ProQuest, 2018. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries
 Sound
 Includes bibliographical references and index
 Carrier category
 1 online resource
 Form of item
 Note
 Electronic reproduction. Ann Arbor, MI : ProQuest, 2018. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries
 Sound
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Creating A Geometry From An Imported Mesh
In COMSOL Multiphysics 5.0, users can create a geometry from an imported mesh and perform solid operations on it a useful practice when modeling some CFD, electromagnetics, and acoustics applications. This video shows you how to utilize the “Create Geometry from Mesh” feature, convert the geometry into a solid object, create a box around it, and subtract it from the surrounding box. We visualize the results by meshing the new geometry and creating a mesh data set and plot.Creating the new surrounding domain is useful for CFD simulations when modeling the flow around an object and/or exploring fluidstructure interactions. For electromagnetics simulations, this is useful when working with Infinite Layer and Perfectly Matched Layer domains to model the electromagnetic field. For acoustics, it comes in handy when using Perfectly Matched Layer domains to model the sound pressure level.Please note that, at this time, an imported mesh can only be used for Boolean operations where there are no intersections between the surfaces of the imported mesh geometry and any CAD geometry that is added to the model.Mesh courtesy of Prof. Likun Zhos research group at Indiana UniversityPurdue University, Indianapolis.
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Next Step: Watch The Introductory Video Series On Using Geometry Tools
Whether you are building a geometry entirely within COMSOL Multiphysics or working off of an external file, you can use the geometry functionality discussed in this blog post to completely customize the composition of your geometry objects. If you are interested in seeing these tools in action, watch our introductory geometry video series:
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Geometry Parts And Part Instances
The CAD tools that are available for creating geometries with COMSOL Multiphysics include a number of socalled geometric primitives basic geometric shapes such as blocks, cones, cylinders, spheres, pyramids, and tori in 3D. You can combine such geometric primitives to form more complex geometries for use in simulations.
Geometry parts provide a way to reproduce and parameterize such complex geometries. They can be used to simplify geometry creation by providing easytouse parts with a number of parameters for tailoring the parts shape or dimension when added to a COMSOL Multiphysics geometry.
An example of a geometry part: A Helical Gear part from the Part Library available in the Multibody Dynamics Module.
When you add geometry parts , they become part instances in the active geometry, where they appear like any other geometry feature as part of the geometry sequence that defines the full geometry used for simulations. In the Settings window for geometry instances, you define the shape, dimension, and location of the part instance by specifying values of the input parameters that have been defined for the geometry part and the position and orientation of the instantiated part .
Not One But Two Geometric Kernels
Geometric kernels can be configured to do different tasks. To ensure the best possible performance, COMSOL Multiphysics provides not one but two kernels. It includes the COMSOL kernel, which works best with geometry created in the software. To handle imported CAD geometry, the CAD Import Module Design Module and LiveLink for CAD products, which you can view in the COMSOL® Software Product Suite, package a dedicated geometric kernel, the Parasolid® kernel .
The Parasolid® kernel provides repair functionality for imported CAD designs. It also includes functionality that enables simplification of the geometry to delete fillets or holes, for example. There is more to it than the repair and defeaturing of imported objects, however. The Parasolid® kernel also powers the geometric modeling functionality included with the Design Module, such as creating lofted surfaces, creating fillets and chamfers on 3D objects, generating the midsurface of solid objects, and adding material to surfaces to create a solid. Last but not least, the usual geometry operations are also implemented by the Parasolid® kernel. This means that even when using this kernel, we can create and modify geometry, including imported CAD objects.
An example of defeaturing in COMSOL MultiphysicsRemoving holes and other details from a geometry during defeaturing.
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Other Parts Of The Geometry Tools In Comsol Multiphysics
In this blog post, we have taken an indepth look at geometry parts and part instances, the available part libraries, and how to create userdefined parts and part libraries. There are many other parts of the CAD and geometry tools and features available in COMSOL Multiphysics that you can use, perhaps together with geometry parts, to create the geometries that you want for your simulation projects. Take a look at the following resources for more information: