Meshing thin geometry in comsol software

If you have any query during your journey with this amazing software. Dramatically different mesh sizes on two sides of a thin part can cause the solid mesher to struggle in trying to connect the two. The comsol multiphysics simulation software environment facilitates all steps in the modeling process. The mesh refinement process a good finite element analyst starts with both an understanding of the physics of the system that is to be analyzed and a complete description of the geometry of the. The influence of welldispersed colloidal silica on the properties of the nanocomposites was investigated. Hi i am new to comsol and have trouble meshing the attached file. For instance, there is a new geometry operation to easily partition faces when modeling with structured meshes or to simplify your cad geometries. Boundary layer meshes which are the default mesh type on walls when using our physicsbased meshing insert thin rectangles in 2d or triangular prisms in 3d at the walls. I want to make extremely fine mesh around small rectangular and finecoarse mesh at. The addition of silica was found to increase the viscosity at lower and higher frequencies.

Browse the threads and share your ideas with the comsol community. The resulting mesh, shown above, consists of about 45,000 elements. Major upgrades to the application builder available in comsol multiphysics include the new editor tools for creation of user interface components, commands for dynamic updates of. The warnings list short edges, narrow faces and faces with narrow regions highlighted in blue in the mesh, and a thin domain. User defined meshing and controlling the mesh size in details. Hi, i suggest you build 2 free triangular, ther first for the thin layer and the second for the others.

Hello mack, very thin and very elongated structures like this one lend themselves very well to swept meshing. Does anyone can help me about meshing a geometry in comsol. The remove details operation has expanded functionality to remove. The application builder allows engineers to make available an easytouse application based on their comsol multiphysics model. Parallel meshing allows each face to be sent to an individual cpu. However, representing the rods as narrow domains in the geometry is usually not reasonable because of the aspect ratio in the geometry and the induced meshing cost.

These highaspectratio elements will do a good job of resolving the variations in the flow speed normal to the boundary, while reducing the number of calculation points in. This option creates a mesh that adapts to the physics selected and their configuration within the model. The mesh used for a geometry plays a significant role in how a model is computed. Step 1 of importing an stl mesh file of a spinal vertebra into comsol multiphysics where a comsol geometry and mesh is created using new features that simplify and remove defects in the mesh. Design and simulation of piezotyres using comsol multiphysics. Experiences from modeling very thin structures in comsol multiphysics bergen comsol user group workshop april 10th 20. Using partition operations for geometries in comsol. This mesh is automatically created and adapted for the models physics settings, with the element size defaulting to normal, and the meshing sequence, consisting of a size and a free tetrahedral node, is hidden. But if you have a more complex geometry with features in the thickness, you might need to partition your domains to get the sweep mesh to work. I would really make this as a set of boxes from the front surface to the bottom one, and then add a frame around. The comsol software automatically formulates the energy equation coupled to the momentum and mass balance equations for ideal gases. The comsol discussion forum covers a wide variety of simulation topics. It is now possible to control and select the entity level point, edge, face, or domain of selections generated by the geometry sequence to use in other operations, such as when defining physics, materials, or meshing.

I tried mapped mesh by dividing 1st block in 6 subdomains. Integrate comsol multiphysics with matlab scripting. The comsol multiphysics fea software comes with predefined physics interfaces with specialized settings, making it easy to set up and run analyses. This is useful for splitting geometric entities such as objects, domains, boundaries, and edges and for removing parts of your models geometry, either to clean it up. As of update 2, the new rotordynamics module is available as an optional addon to the structural mechanics module. Deformed geometry simulation i am relatively new to comsol, and i have been working my way up slowly through simpler setups, but i have reached a total stopping point trying to model moving geometry in the domain. How to simulation of thin film nanocomposite by comsol for. The tet mesh has very small elements in the trace, whereas the prism mesh is composed of thin elements in this region. Comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the technical support team. See reference manual for comsol multiphysics, version 5. Livelink for matlab allows you to utilize the full power of matlab and its toolboxes in preprocessing, model manipulation, and postprocessing. Discussion closed this discussion was created more than 6 months ago and has been closed. There are specialized tools for generating certain types of geometries, such as those obtained from cutting through a solid by a plane.

Experiences from modeling very thin structures in comsol. This discussion is about an older version of the comsol multiphysics software. Want to learn more about the meshing capabilities of comsol multiphysics. One of the first steps for creating a model is to build the geometry.

Swept meshing is a geometry discretization technique available in comsol multiphysics for specific types of geometries, including thin geometries, geometries with bends, and models with little or no variation in a specific direction. In comsol multiphysics, you can build 2d geometries by using any of the geometry operations, tools, and other functionality available in the software. There is a warning that the boundaries are all going to the default, this is not true but i did not know how to prevent this warning. Efficiently mesh your model geometry with meshing sequences. Building the mesh for a model geometry in comsol multiphysics. Use of beizer polygon to build the 2d asymmetric geometry. In both cases, when meshing these models, automatic mesh refinement resolves the shock pattern by refining around the regions with very high velocity and pressure gradients. Integrate matlab code with comsol multiphysics models.

Meshing advice for solid meshing thin parts in simulation. In the comsol multiphysics software, you can use a range of tools, operations, and functionality to create the geometry for your model. If you go ahead and mesh this geometry with just the default physicscontrolled mesh capability, you will obtain a mesh like that pictured below. One such tool, partition operations, enables you to separate out any part of your models geometry. In the comsol multiphysics software, you can streamline the process of meshing your model geometry by having the software do it automatically or you can choose to build a custom mesh manually. Model with comsol multiphysics on meshes based on mri and scanned data the following software support export to comsol mesh format mimics by materialise, read more on. A cad model of a pipe volume for fluid flow analysis. The new thin rod feature provides a lumped heat transfer model to model highly thermally conductive rods as edges. Excerpt from the proceedings of the 20 comsol conference in bangalore 3. First, using a helix primitive object, we show you how to divide and conquer the meshing for a relatively complex geometry by splitting it into smaller, simpler domains. Quads and sweep meshing is very easy for regular rectangular shapes. Seamlessly integrate comsol multiphysics with matlab to extend your modeling with scripting programming in the matlab environment. I understand that cannot use the automatic mesh for this geometry because of the large aspect ratio. You can find these for thermal conductance, electric conductance, and as shells in the structural models.

Since the model is meshed before the thin elements are connected, parallel meshing can be used to produce the mesh faster. However this means that you must apply more physics and equations to your layers to emulate the desired effects. Partitions and other geometry operations that benefit meshing. Ansys meshing chooses the most appropriate options based on the analysis type and the geometry of the model. Nov 19, 2009 meshing thin films is a very tricky issue, therefore comsol proposes ways to approache thin films by special boundary conditions. Our project piezotyres is designed using comsol multiphysics 4. But generally, you can mesh the short edge and then sweep along the long one. Meshing of thin geometry software di simulazione comsol. One of the first steps to building a model is creating the geometry. Improving your meshing with swept meshes comsol blog. This includes a plethora of builtin objects for modeling commonly used shapes, parameters for defining the dimensions and position of your objects, as well as boolean, transformation, and. This process of mesh refinement is a key step in validating any finite element model and gaining confidence in the software, the model, and the results.

Automatic removal of geometric detail for more flexible meshing. In the comsol multiphysics software, you can have the software automatically create a mesh or manually build a. Nov 12, 2014 comsol has released comsol multiphysics software version 5. Since we import two parts, we expect to get two domains one for the tube and one for the crown. The structural mechanics module includes both predefined material models to choose from and the ability to enter userdefined material models, depending on the nature of your analysis. Building 2d objects from 3d geometries comsol multiphysics. It is basically a disk diameter 5mm, thickness 1um with 4 rectangular channels width 1mm, thickness 1um. The new comsol multiphysics release includes improvements to the automatically generated selections from geometry operations. A default mesh on the electronic component geometry. Cfd software for simulating fluid flow applications.

It is basically a disk diameter 5mm, thickness 1um with 4 rectangular channels width 1mm. This includes a number of builtin objects for commonly used shapes as well as parameters that enable you to define and position objects. Especially convenient is the ability of ansys meshing to automatically take advantage of the available cores in the computer to use parallel processing and thus significantly reduce the time to create a mesh. Commercial meshers comsol mesh to openfoam cfd online. Whenever your geometry has layers that are about 10 3 or so times thinner than the largest dimension of the part, the usage of. Challenges when working with thin elements in large. This is done through a physicscontrolled or usercontrolled mesh sequence type, respectively. Adaptive meshing the solver remeshes for most accuracy. When i try to mesh it the process never finishes, and earlier when i had a mesh on a similar geometry the simulation didnt converge. Always perform a mesh refinement study and monitor the memory requirements and convergence of the solution as you refine the mesh.

For this structural mechanics solid mechanics and piezo electric devices are selected and the designing is as follows. Next, using the geometry from the shellandtube heat exchanger tutorial model, we demonstrate exploiting the symmetry of an object to simplify a simulation. Browse these and more cfd module updates and features below. Simulation software fosters collaboration chemical processing. Jul 21, 2017 hello mack, very thin and very elongated structures like this one lend themselves very well to swept meshing. Therefore, the more faces in the model, and the more cpus available, the faster the mesh will be completed. Note that while comsol employees may participate in the discussion forum, comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the technical support team. Comsol software users who are onsubscription should submit their questions via the support center for a more comprehensive response from the. Meshing for very thin conductors comsol multiphysics. This is a reduced version of the presentation without figures for the coil case. Whenever your geometry has layers that are about 10 3 or so times thinner than the largest dimension of the part, the usage of bricks and prisms becomes very highly motivated. For the thin layer, you might want to add two distribution node and specify a pretty high number of elements, to be sure to have a mesh thin enough. In this video, we will learn how to use the beizer polygon to build the 2d axisymmetric geometry by an example of a taper.

The geometry for a fluid flow model of just one pipe in this network might look like the image below. Meshing thin high aspect ratio geometries comsol multiphysics. Also for thin layers square mesh usually works better than triangular. Browse all of the new features and functionality in the structural mechanics module below. Jan 02, 2018 the mesh used for a geometry plays a significant role in how a model is computed. Help with meshing thin geometry comsol multiphysics. Nov 04, 20 if the geometry contains thin layers of material, use bricks or prisms or consider using a boundary condition instead. There are also improved capabilities for meshing tetrahedral and hexahedral elements. During meshing the comsol model you have to remember one think is that the minimum mesh size should be smaller than your smallest domains in your model. It consists of a very thin layer between 2 thicker ones and thin spacing.

To get the boundary names you need to make a reportfile. In this image, we see the original mesh, which was provided courtesy of mark yeoman, continuum blue ltd. How to build a mesh in comsol multiphysics youtube. The solid meshing of thin parts can fail due to very differentsized mesh on the opposite sides of a thin part. To help you build 3d geometries, comsol multiphysics contains a number of geometry tools, operations, and other functionality. A swept mesh starts at a source boundary and sweeps along to a specified destination boundary. Introduction to meshing 4 symmetryche ck co mplete pa rt symm etry meshing only a qua rter of the pla te and sub pa rt symm etry, rep etition of features, and the co pypas te meshing the highligh ted 22. Jan 16, 2015 by default, the meshing sequence in the software uses the physicscontrolled mesh option. The remove details operation has expanded functionality to. Meshing the geometry gives warnings about small details, also indicated by the spots with highdensity mesh.