In the era of automatic tetrahedral meshing, many have lost their way. Wondering analysts simply read in their geometry, specify a few sizing controls, hit a mesh button and get a mesh. But in the end, they receive a mesh that is not ideal, especially on the surface. What these meandering meshers need is a map… a mapped mesh.
Bad intro aside, many users are not aware of the strong capabilities available in Workbench meshing for creating really nice mapped meshes on surfaces. For simple geometry, and some not so simple, you simply slap that control on a face or faces and let ANSYS figure out the best way to make a mapped mesh.
Figure 1: Insert Mapped Face Meshing. But over the last couple of releases more intelligence has been added to recognize complex geometries as mapable. Figure 2 shows several different topologies and how the mesher does a nice job of mapping them with no user modification. Note that the last topology did not map mesh. We will come back to that. But the other five all meshed with a nice looking mapped mesh. What they do is take geometry and break it up into 4 sided chunks.
They call this making Submaps. But to do this they need to identify the outside edges in terms of squarish topology. The secret to doing this is identifying the vertices points where edges connect as either a corner, a side or an edge.
Figure 3 stolen from the user manual shows an example of each:. Figure 3: Vertex Types. The algorithm identifies the vertex type by looking at the inside mesh side angle formed by the two edges attached to the vertex using based on the following table:.
You can get a feel for the algorithm but not the actual one, it is much more complex by stepping through breaking up the geometry in Figure 3 and follow the following steps in your head:.
Pretty cool, huh. I wish I would have thought of that. You do this in the Details view for the Mapped Face Meshing method you attach to the face. You basically click on the cell for Sides, Corners and Ends and then identify the vertices for each. The result is the free mesh shown in Figure 5.
If you want a mapped mesh, you need to specify the vertices on the rounds. Figure 6 shows the result. Well, maybe sometimes the free mesh is better.
The other option on really nasty geometry is to take it into DesignModeler and imprint the surfaces to create your own sub maps. In most cases, just putting a Mapped Face Meshing control on a surface will give you a nice mapped mesh.
ANSYS Meshing - Quad Cells
The mapped mesh is usually more uniform, has less distorted elements, no triangles, and usually has less nodes. But a mapped mesh is not always better, you need to use your engineering judgment to decide which is best in each application.
I like to use this control on fillets and on blocky parts. So, when you are not liking the look of the default surface mesh, even if you are not hex meshing your model, turn off the autopilot, and try a Mapped Face Meshing control.
You must log in to post a comment. Skip to content In the era of automatic tetrahedral meshing, many have lost their way. Go to the first corner you encountered. Shoot a line along the vector from B-C until you intersect with an edge.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.
Computational Science Stack Exchange is a question and answer site for scientists using computers to solve scientific problems. It only takes a minute to sign up. What is the best scalability and efficiency algorithms for generating unstructured quad meshes in 2D? Direct methods generate a quad mesh directly, usually by some advancing front method. The Paving paper is a standard reference and is the method used by CUBITso you have seen these meshes in many publications.
Indirect methods generate some intermediate decomposition of the domain e.
Note that smoothing is necessary for both approaches, sometimes with alternating topology fix-up and smoothing steps. Some open source tools have built-in smoothing facilities and the LGPL-licensed Mesquite package is designed as a library specifically for mesh quality improvement. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
Unstructured quad mesh-generation? Ask Question. Asked 8 years, 3 months ago. Active 8 years ago. Viewed 5k times. Where can I find a good unstructured quad mesh-generator?
Allan P. Engsig-Karup Allan P. Engsig-Karup 3, 13 13 silver badges 29 29 bronze badges. A tip: when creating a multi-word tag, please use dashes to separate out the words. Dec 28 '11 at Active Oldest Votes.
I know of two open source free-quad meshers: Gmsh GPL with linking exception can generate quad meshes using a recombination algorithm described in this paper. You can download the source through the link above, but it is not ready for production use yet. LBIE generates quad and hex meshes from volumetric data.
From what I can tell, it is an interactive environment rather than a library.I am getting failed mesh in the regions shown in attachmentthe actual geometry is quite large hidden to get a clearer view of the failed bodies. The whole geometry consists of 92 bodies and these 2 are the only ones creating problem. Other than this i am also getting quite a large no. What can be the possible reason for that. And How to overcome this issue? Attached Images Failed Mesh. June 28, Join Date: Apr Use of face sizing, edge sizing and body sizing will help.
Try to read about inflation and also which method is best suitable for your geometry. June 29, I went on to improve my meshing quality, but a couple of bodies always show mesh failure with the message,"The mesh faces on the following topological surfaces may intersect with mesh faces on other topological surfaces in the model, Please use different mesh size, virtual topology or correct CAD geometry.
Use right sizing where you have bad elements. Also check your geometry, are you importing it from CAD? And use symmetry in your model if you can, no point running whole model. But these couple of bodies, are meshed in triangular mesh 2Dwhen i cut a section i found it to be hollow I cross checked again in CAD, it was solid. The problem may be rectified if i am able to convert it to Solid again.
Please help me out here. July 1, Join Date: Mar Refining the mesh size should help you out quite a bit. Are all of your volumes in one part? The volumes in the first figure seem to be non-conformal, which is of course quite ok if that's something you would want.
Mapped Face Meshing in ANSYS Workbench
Collecting every volume under one part might help you with the topological trouble. Did you try to use the "share topology" tool in DesignModeler yet? The tool might give you hint if there's something wrong with your model.October 29,How to create Quadrilateral mesh. Shuvayan Brahmachary. Hi everyone! I created the geometry and after meshing I found that the system, creates by default the triangular mesh which has to be changed to quadrilateral mesh as per my Project guide instructions.
Can anyone please tell me how to change the triangular mesh to quadrilateral. Any help would be appreciated. Shuvayan Brahmachary Asst. October 29, You need some working Design modeller to make the map mesh. However this task can be done more conveniently in ICEM.
[ANSYS Meshing] How to create Quadrilateral mesh
October 30, If not than how can it be done in ICEM?? I just converted the triangular mesh to quadrilateral mesh. November 29, Hells Blade. November 30, Georgi Panchev.
Hi Shuvayan! Here you can see more about meshing. Tags ansys meshingcfxquad meshtrigular meshing Thread Tools. BB code is On. Smilies are On. Trackbacks are Off. Pingbacks are On.I want to mesh a 2D-rectangle with quad cells. By the meshing of this domain, it gives triangle cells too. I have set an element size on the edge of the domain with the same cells size as the size of the cells into the domain.
LipatovaAlexandra is a new member in the forum. Ouardighi is a new member in the forum. MWael is a new member in the forum. ArunM is a new member in the forum.LEAP Australia is the leading engineering software solutions provider in Australia and New Zealand, assisting thousands of companies with their design and engineering problems. The aim of this site is to share the extensive experience and knowledge we have gained over the years in working with Computational Fluid Dynamics.
Sweep meshing is a meshing method available in ANSYS Meshing that is important for all CFD users to understand and can be readily used to maintain high solver accuracy at the same time as reducing mesh cell counts leading to a serious speedup in solve times. This allows us to appropriately decompose or slice our domain into a combination of individually "sweepable" bodies. Upon choosing this option, any bodies within your assembly that can be swept automatically will be shown in green on your screen.
Often the problem is due to some small sliver surface or other area that is inhibiting the regular grid-like 'map meshing' of all side faces along the direction of the sweep which simply need to be cleaned up before this can occur.
We then change the type to Sweep, and choose the body that we aim to sweep. At this point, we can choose to create an initial mesh to confirm that the swept mesh can be created as expected. We can then apply additional face sizing and inflation to the source face and generate a final swept mesh for the body.
You can see in the image below that the source face on the end of the cylinder has been meshed, which was then brought through the swept section at specified intervals resulting in a mapped quad rectangular mesh on the side faces of the cylinder.
We'll discuss their importance to CFD accuracy, how to properly define them and explain the preferred settings.
In the meantime, please contact our Support Team if you have any further questions on meshing for your particular applications. Sweep Mesh Examples. Showing Sweepable Bodies.
Unstructured Swept Mesh with Inflation. Share this post Linkedin.
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