But i found a great difference in the Mesh of each one, Why?!!! You can use two different methods to generate your model in APDL : solid modeling and direct generation. With solid modeling, you describe the geometric boundaries of your model, establish controls over the size and desired shape of your elements, and then instruct the ANSYS program to generate all the nodes and elements automatically. By contrast, with the direct generation method, you determine the location of every node and the size, shape, and connectivity of every element prior to defining these entities in your ANSYS model.
In spite of the many advantages of solid modeling, you might occasionally encounter circumstances where direct generation will be more useful. You can easily switch back and forth between direct generation and solid modeling, using the different techniques as appropriate to define different parts of your model.
Cannot be used with adaptive meshing. Makes it difficult to modify the mesh tools such as area mesh refinement, SmartSizing, etc. Meshing in Workbench follows different approaches and methods: Assembly meshing refers to meshing an entire model as a single mesh process, as compared to part-based or body-based meshingin which meshing occurs at the part or body level respectively.
Patch conforming meshing is a meshing technique in which all faces and their boundaries edges and vertices [patches] within a very small tolerance are respected for a given part.
Patch independent meshing is a meshing technique in which faces and their boundaries edges and vertices [patches] are not necessarily respected unless there is a load, boundary condition, contact, Named Selection, result, or other object scoped to the faces or edges or vertices topology.
These four elements can be used, in various combinations, to mesh any 3D model.
[ANSYS Meshing] How to connect properly different types of mesh
For 2D models, you have triangular and quadrilateral elements available. Tetrahedra are also known as a simplexwhich simply means that any 3D volume, regardless of shape or topology, can be meshed with tets. They are also the only kind of elements that can be used with adaptive mesh refinement. For these reasons, tets can usually be your first choice.
The other three element types bricks, prisms, and pyramids should be used only when it is motivated to do so. It is first worth noting that these elements will not always be able to mesh a particular geometry. The meshing algorithm usually requires some more user input to create such a mesh, so before going through this effort, you need to ask yourself if it is motivated. Here, we will talk about the motivations behind using brick and prism elements. The pyramids are only used when creating a transition in the mesh between bricks and tets.
It is worth giving a bit of historical context. The mathematics behind the finite element method was developed well before the first electronic computers.
Some of the first finite element problems solved were in the area of structural mechanics, and the early programs were written for computers with very little memory.ANSYS Mesh Metrics and Shape Checking
Thus, first-order elements often with special integration schemes were used to save memory and clock cycles. However, first-order tetrahedral elements have significant issues for structural mechanics problems, whereas first-order bricks can give accurate results.
As a legacy of these older codes, many structural engineers will still prefer bricks over tets. In fact, the second order tetrahedral element used for structural mechanics problems in the COMSOL software will give accurate results, albeit with different memory requirements and solution times from brick elements. The primary motivation in COMSOL Multiphysics for using brick and prism elements is that they can significantly reduce the number of elements in the mesh.
These elements can have very high aspect ratios the ratio of longest to shortest edgewhereas the algorithm used to create a tet mesh will try to keep the aspect ratio close to unity. It is reasonable to use high aspect ratio brick and prism elements when you know that the solution varies gradually in certain directions or if you are not very interested in accurate results in those regions because you already know the interesting results are elsewhere in the model.
The mesh on the left is composed only of tets, while the mesh on the right has tets greenbricks blueand prisms pinkas well as pyramids to transition between these elements.
The mixed mesh uses smaller tets around the holes and corners, where we expect higher stresses. Bricks and prisms are used in the spokes and around the rim. Neither the rim nor the spokes will carry peak stresses at least under a static loadand we can safely assume a relatively slow variation of the stresses in these regions. The tet mesh has aboutelements and arounddegrees of freedom. The mixed mesh has close to 78, elements and roughlydegrees of freedom, taking about half as much time and memory to solve.
The mixed mesh does take significant user interaction to set up, while the tet mesh requires essentially no user effort. Note that there is not a direct relationship between degrees of freedom and memory used to solve the problem.
This is because the different element types have different computational requirements.
ANSYS Meshing Solutions
A second-order tet has 10 nodes per element, while a second-order brick has This means that the individual element matrices are larger, and the corresponding system matrices will be denser, when using a brick mesh. The memory and time needed to compute a solution depends upon the number of degrees of freedom solved for, as well as the average connectivity of the nodes, and other factors.
Another example is shown below. Since the deformation is quite uniform along the length of the helix of the spring, it makes sense to have a mesh that describes the overall shape and cross section, but relatively stretched elements along the length of the wire.April 11,How to connect properly different types of mesh. Hi everyone, I'm trying to mesh a not very complicated geometry, as you can see in the file attached, but since I'm a beginner I want to ask you some questions.
There are 3 batteries that I mesh with 1mm hexa mesh elements and 2 cooling plates with 6 channels rectangular section 1 mm x 1 mm inside of them. The mesh elements of the channels and the plates are tetrahedrons, but for the batteries I've to use hexa elements in order to correctly use the MSMD battery module in Fluent.
Moreover, I've inserted the following mesh commands: - Face sizing of the contact face between channels and plates: elem. I already set parameters in the general Mesh panel: Adaptive, fine mesh. Hope that you can understand from the file attached. Thanks for the time. Thread Tools. BB code is On. Smilies are On. Trackbacks are Off. Pingbacks are On. Refbacks are On. Forum Rules.
All times are GMT The time now is Add Thread to del. Recent Entries. Best Entries. Best Blogs. Search Blogs. User Name.Meshing is an integral part of the computer-aided engineering simulation process.
The mesh influences the accuracy, convergence and speed of the solution.
Furthermore, the time it takes to create and mesh a model is often a significant portion of the time it takes to get results from a CAE solution. Once the best design is found, meshing technologies from ANSYS provide the flexibility to produce meshes that range in complexity from pure hex to highly detailed hybrid; a user can put the right mesh in the right place and ensure that a simulation will accurately validate the physical model.
Otherwise, Tetrahedrons Patch Conforming is used. Reducing the number of midside nodes reduces the number of degrees of freedom. Program Controlled is the default. For surface bodies and beam models, Program Controlled is identical to the Dropped option described below. For solid bodies and 2-D models, Program Controlled is identical to the Kept option described below.
The Dropped option removes midside nodes on all elements. Examples shown below are for a solid body. The Kept option retains midside nodes on elements created in the part or body. All elements will have midside nodes. An algorithm setting is displayed allowing you to choose how the tetrahedral mesh is created based on your choice of one of the following options :.
Patch Conforming Method. Faces, edges and proximities are respected and resolved. Patch Independent Method. Defined name selections before grid generation process. Hex Dominant Meshing Methodwhere a free hex dominant mesh is created. The mesh contains a combination of tet and pyramid cells with majority of cell being of hex type. Hex dominant meshing reduced element count. The mesher will fail if a swept mesh cannot be generated on a body with a sweep method control.
It automatically generates a pure haxehedral mesh where possible and then fills the more difficult to capture regions with unstructured mesh. The MultiZone mesh method and the Sweep mesh method operate similarly; however, MultiZone has capabilities that make it more suitable for a class of problems for which the Sweep method would not work without extensive geometry decomposition. Very simple and straightforward information beautiful explained for understanding the Ansys meshing methods.
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Share this: Twitter Facebook. Like this: Like Loading Comments 4 Trackbacks 0 Leave a comment Trackback. Great stuff!Meshing is an integral part of the engineering simulation process where complex geometries are divided into simple elements that can be used as discrete local approximations of the larger domain.
The mesh influences the accuracy, convergence and speed of the simulation. Furthermore, since meshing typically consumes a significant portion of the time it takes to get simulation results, the better and more automated the meshing tools, the faster and more accurate the solution. ANSYS provides general purpose, high-performance, automated, intelligent meshing software which produces the most appropriate mesh for accurate, efficient multiphysics solutions — from easy, automatic meshing to highly crafted mesh.
Methods available cover the meshing spectrum of high-order to linear elements and fast tetrahedral and polyhedral to high-quality hexahedral and Mosaic. Smart defaults are built into the software to make meshing a painless and intuitive task delivering the required resolution to capture solution gradients properly for dependable results.
Advanced controls for the expert user deliver tailored, problem-specific meshing solutions. Design exploration is easy with replayable controls and the option to script complex workflows. High-performance computing enables parallel processing, which drastically reduces the time for mesh generation. ANSYS Meshing Solutions Meshing is an integral part of the engineering simulation process where complex geometries are divided into simple elements that can be used as discrete local approximations of the larger domain.
Common Types of Mesh Advanced controls for the expert user deliver tailored, problem-specific meshing solutions. Learn More. Meshing in Mechanical - Webinar. Mosaic Meshing Technology. Overview Features Creating the most appropriate mesh is the foundation of engineering simulations. ANSYS Meshing is aware of the type of solutions that will be used in the project and has the appropriate criteria to create the best suited mesh.
For a quick analysis or for the new and infrequent user, a usable mesh can be created with one click of the mouse. ANSYS Meshing chooses the most appropriate options based on the analysis type and the geometry of the model. 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.
Parallel meshing is available without any additional cost or license requirements. Physics-aware meshing Hexahedral default Tetrahedral mesh alternate Automated size controls Automated inflation Automated part repeat Automated periodic parts Auto update with parameters Patch conforming Patch independent Polyhedral Beam and shell Defeaturing Mesh matching Mapped mesh control Mesh control move, merge, edit.I'm talking about the element type for meshing:.
I'm talking about the element type for meshing: For 2D, you can mesh the geometry with tirangles and squares. An overview would be great. Thanks a lot. Permalink 0 0 0. Search in Post Topic. Popular Tags fluent ansys udf workbench cfd asc mesh fluid-dynamics error mechanical apdl cfx meshing structural-mechanics maxwell hfss static-structural general transient student This Weeks High Earners peteroznewman abenhadj 90 rwoolhou 87 kkanade 64 tsiriaks 60 pblarsen 49 Aniket 35 Amin 29 Kremella 27 pnisc Recent Activity Sarah.Learn more about SimuTrain or get started today by purchasing your subscription.
Well-shaped elements yield superior results, and help reduce element shape errors during large displacement analysis, such as when using hyperelastic materials with substantial strain.
This article briefly reviews features in the Workbench Mechanical Outline for displaying element quality 1 in color in the Mesh branch, 2 using bar charts of element quality, and 3 plotting element quality in postprocessing after element shapes have been distorted by strain in a model.
Workbench Mechanical First, though, here is a view of mesh metrics as they have been measured in Workbench Mechanical in the last few versions of the software:. Many choices are available:.
After choosing a quality metric, a bar chart is generated showing how many elements fall into ten Element Metrics zones. If one of the ten bars in the chart is clicked by the user with the cursor, then the elements that fall into the zone of that Element Metric are displayed in the Graphics Window. In Figure 4 below, the bar with Element Quality around 0.
The second means of viewing element quality is to create color plots. What is new in As seen in Figure 5 below, a mesh quality assessment can be shown in a color plot at the Mesh branch. Body Color does not show an element quality assessment. The quality plot choices are:. The third type of element quality assessment that is available is in postprocessing. The elements in their deformed shape are assessed, at a solution time that can be set by the user. The plots are from the User Defined Results list.
In Figure 7 above, note that several element shape quality assessments can be chosen from the listing of User Defined Results. They include:. Note that some choices, such as Parallel Deviation, are not applicable to tetrahedral elements, and will produce a null result. As postprocessing results, the element shapes are assessed in the element deformed condition, with element deformation a consequence of strain in the model. Figure 8 below illustrates.
In Figure 8, the Element Quality shape assessment has been performed on element shapes as deformed by the solution. In the Tabular Data for this solution result, note the difference in the Minimum and Maximum values at Time values of 1. This difference is a result of changing loads on the model between times of 1.
When evaluating Solution results, User Defined Results can be created for several element shape assessments, which are applied to the deformed elements, yielding colored plots. In the colored plots, values in the Legend can be user-adjusted, and other review tools can be employed, such as Probe, Min and Max, and the usual contour controls.
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