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1、Mesh ControlWorkshop 3ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing ControlsWorkshop 3 - GoalsUse the various DS mesh controls to enhance the mesh for the crankshaft model.Problem statement:The model consists of a Parasolid file representing a cranks
2、haft for a small engine shown below.Our goal is to mesh the model using all defaults and inspect the result. Next we will add mesh controls to modify the mesh in various regions of the model.February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop Supple
3、mentWorkshop 3 - Meshing ControlsWorkshop 3 - AssumptionsSince this is a meshing exercise we will not be applying loads or solving the model. Instead we will assume a linear static structural analysis is to follow the meshing operation.February 13, 2004Inventory #002022WS3-ANSYS Workbench - Simulati
4、onANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing ControlsWorkshop 3 - Start PageChoose “A link to a geometry file on my computer or network” and browse to the file “Crankshaft.x_t”.Call the project “Crankshaft” and specify the location provided by the instructor.“Open a new simu
5、lation based on the selected geometry”When DS starts, close the Template menu by clicking the X in the corner of the window.Note: by closing the menu we gain some additional space for the graphics view. Also, although we could use the SimWiz to complete this workshop, instructions on manually comple
6、ting the operations are given.February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing ControlsWorkshop 3 - Basic Meshing1.To apply, modify and preview the mesh and meshing controls highlight the mesh branch.1February 13, 2
7、004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 - Basic Meshing2.Inspect the mesh detail window. Notice the default global control is “Basic” and the “Relevance” is 0. Note: advanced mesh features are av
8、ailable as a licensed option.3.RMB on the mesh branch and choose to “Preview Mesh”.23February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 - Basic MeshingThe completed mesh (shown here) is made u
9、p of a relatively coarse tetrahedral mesh.4.Expand the “Statistics” section of the details window to check the number of nodes and elements.Note the actual number of nodes and elements will vary slightly across different machines and platforms.4February 13, 2004Inventory #002022WS3-ANSYS Workbench -
10、 SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing ControlsWorkshop 3 Mesh Relevance5.In the detail window for the mesh change the “Relevance” to 50 (note: relevance may be set by dragging the slider bar or typing the desired value into the field).Again RMB the mesh branc
11、h and “Preview” the mesh. A visual inspection of the mesh along with the statistics section in the detail window can be used to compare the effects of the meshing changes.5February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Me
12、shing ControlsWorkshop 3 Sizing ControlWe will assume the pin section (shown boxed at right) is an area of interest for us. We will apply a local mesh control in this region.Well take advantage of several shortcuts in DS to help us evaluate the appropriate size for the control.February 13, 2004Inven
13、tory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 Sizing ControlFirst orient the model so we are viewing down the X axis as shown here.A handy shortcut to do this is to use the triad to re-orient the model. Clicki
14、ng on any of the axes (or the “iso” ball) the triad will rotate the model accordingly.February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 Sizing ControlZoom into the area of interest. Notice th
15、e region is made up of 3 surfaces. To gauge the size of the region we can use the ruler tool (If the ruler is not displayed, use the ruler toggle at the top of the GUI to activate it).Inspection of the model shows the pin section is roughly 10 mm across. February 13, 2004Inventory #002022WS3-ANSYS W
16、orkbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 Sizing Control6.Select the 3 surfaces in the pin region. Note: by holding the CTRL key we can select each of the desired surfaces individually using left mouse clicks. An alternative sho
17、rtcut called “paint selecting”, is to hold the left mouse button while dragging the cursor over the desired areas (no CTRL key necessary). 6February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 S
18、izing Control7.With the 3 surfaces selected choose “Sizing” from the mesh control menu.8.In the detail for the size control change “Element Size” to 1 mm.78February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing ControlsWo
19、rkshop 3 Mesh RefinementAgain “Preview Mesh” and inspect the new mesh as before.We will also assume the chamfer section on the side of the flywheel is also an area of interest. February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3
20、 - Meshing Controls. . . Workshop 3 Mesh Refinement9.To apply the refinement control first select the chamfer surface.10.Highlight the mesh branch and RMB. Choose “Insert Refinement”.910February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementW
21、orkshop 3 - Meshing Controls. . . Workshop 3 Mesh RefinementMesh refinement is an iterative meshing tool that can be set to integer values from 1 to 3 . A value of 1 provides the least refinement (coarsest mesh) while a value of 3 provides the most refinement (finest mesh). Leave the refinement leve
22、l set to 1 and again “Preview Mesh”.February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing ControlsWorkshop 3 Mapped Faces Finally well apply a “Mapped Face Meshing” control to a surface in the model. Mapped face meshing
23、is typically used in contact analyses to insure a “regular” mesh on the contact surface. High quality elements are often required when detailed contact results are desired.11.Select the cylindrical surface shown here (either side of the part is OK).11February 13, 2004Inventory #002022WS3-ANSYS Workbench - SimulationANSYS Workbench - SimulationWorkshop SupplementWorkshop 3 - Meshing Controls. . . Workshop 3 Mapped Faces12.Highlight the mesh branch and RMB. Choose “Insert Mapped Face Meshing”.Again “Preview Mesh”.Mapped Face MeshDefault Mesh12February 13, 2004Inventory #002022WS3-
