automesh子面板详细解释.docx

HyperMesh and BatchMesherAutomesh PanelClick here to display Table of Contents HyperWorks Desktop Applications HyperMesh Users Guide HyperMesh Panels HyperMesh Panels Listed Alphabetically:Automesh PanelAutomesh PanelLocation: The Automesh panel can be accessed from the menu bar by clicking Mesh Create 2D Automesh, or by pressing the F12 function key.The Automesh panel is used to generate a mesh of plate elements using surface geometry or existing shell elements to define the mesh area. Panel UsageThe options in the panel can be set in any order that you feel comfortable using. Moving from subpanel to subpanel will not cause you to lose work. When finished making all your selections, start the meshing process using the mesh button on the right side of the panel.Set the panel mode by selecting the appropriate subpanelSelect the meshing method by setting the entity selector to surfs or elemsMake the required element criteria settingsSet any algorithm optionsSelect the area to be meshed using the entity selector and any extended selection methods desired. Note:The unmeshed and failed selection buttons on the right side of the panel can be used to make pre-defined surface selections if desired. Use the interactive image below to see the various options on each subpanel. To start, click either elems or surfs in the upper left corner. To reset the image, click the return button.Subpanels and InputsThe Automesh panel contains the following subpanels:Size and BiasSize and bias meshing is a very flexible and powerful meshing method. A minimum of inputs are required for the element criteria settings. The algorithm options can set preferences on how to handle certain situations when encountered in the geometry. When using existing finite elements as the basis for mesh generation, feature recognition settings allow the mesher to break up the areas defined by the selected elements into logical groupings with mesh controls set for each group boundary. This meshing mode works interactively or automatically. In interactive mode, a great deal of manual control is presented via the Secondary Automesh panel during the mesh generation stage. Interactive meshing allows you to control mesh size and element type, and to set different mesh generation algorithms and test element quality on a surface-by-surface basis. The resulting modified mesh can be updated at any time, giving immediate feedback as to the effectiveness of the change. When meshing in the automatic mode, the mesh will be generated using only the settings, criteria and options set in the Automesh panel.Size and biasing produces a mesh with consistent element size. If meshed interactively, the number of elements (element density) node spacing (biasing), element type and mesh style can be modified for each surface face and edge.Panel InputsInputActionentity selectorSet to use surfaces or existing finite elements to define the area to mesh. Extended entity selection options are available to populate the selection.featuresWhen using existing finite elements as a basis for automeshing, feature recognition is used to define logical faces. Use this switch to determine how the automesher treats features:connected features automatically detects features based on the specified feature angle and make additional effort to void any orphan or non-closed feature lines. It works similarly to auto detect features, but includes a more rigorous check to combine small areas and avoid creating features that end abruptly or do not connect to any other features.auto detect features automatically detects features based on the specified feature angle. In some cases this can create feature edges allows you to pick surface edges in the model to preserve as features.lines allows you to pick lines in the model geometry to preserve as features.mesh mode toggle - interactive / automaticInteractive mode will expose the interactive Automeshing secondary panel once the meshing has started.Automatic mode uses only the settings and selections made in the panel to complete the meshing process.element sizeEnter a floating point numeric value for the average element size. The length of any active (shared or free) surface edge will be divided by this number to determine the number of elements to place along that edge. mesh typeSelect quads, trias, mixed, R-trias, Quads only, or advanced to specify the type of element to use in building meshes. Mixed uses quads primarily, but inserts trias when making density transitions, resulting in improved mesh quality.Quads attempts to use quads only-however, at least one tria element must be created if the sum of the element densities around the perimeter of the face or surface is odd. The sum of element densities on the perimeter of the lower surface is odd, resulting in a tria as indicated.Adjusting the element densities while meshing interactively can usually elimate all tria elements.Adjusting the bottom edge density from 11 to 10 makes the sum even and allows all-quads to be generated.Quads only uses a subdividing routine that tends to generate more orthogonal quad elements. Tria elements may still be introduced depending on the density settings as with the quads type.Tria elements uses all-trias to mesh.R-trias are right-angle triangular elements. If you select Advanced, choose any of the other types individually for mapped elements (elements on surfaces that can be mapped to simple geometric shapes) and free elements (those that cannot easily map to simple shapes). AdjutAmapped typeChoose the type of elements (as for Mesh type above) to use for surfaces that can be mapped to simple geometric shapes.map as circle - freemap as circle - mappedmap as rectangle - freemap as rectangle - mappedmap as pentagon - freemap as pentagon - mappedfree typeChoose the type of elements (as for Mesh type above) to use for surfaces that cannot be mapped to simple geometric shapes.feature angleSpecify a maximum angle across which elements can be maintained. Any time two adjacent elements normals would exceed this angle HyperMesh creates a new set of nodes between them to maintain clean feature lines. Using a higher value results in elements spanning the feature line:With an appropriate value, the features lines are preserved.If feature angle = is too high, the feature lines are blurred.vertex angleWhen using connected features or auto detect features, this setting is a maximum element vertex angle. Whenever an element vertex exceeds this angle while adhering to features, the element will be split into two elements with correspondingly smaller vertices.elems to surf comp / elems to current compSelect the destination component for the newly created elements as the “current” active component or the component to which the surface belongs. The current component is indicated in the component list of the Model browser, or the component status display of the status bar.first order /second orderSet to create first order (linear shape function) or second order (polynomial shape function) elements.connectivitySelect how the connectivity between the newly created elements and any adjacent existing elements will be handled. Choices include:keep connectivity: use the existing nodes on any shared boundary edges.redo connectivity: re-seeds any existing nodes along the boundary of the newly created mesh to optimize mesh quality. break connectivity: ignore any existing adjacent elements and generate the mesh according to the size and type specified.previous settings: re-use any previous node density and spacing settings associated to the selected surface edges. flow: alignProduce a more orthogonal quad-dominant mesh. Only applies to mixed element type. Here, there is no flow alignmentFlow alignment is used, producing straighter rows of elementsflow: align produces a more orthogonal quad dominated meshflow: size appears only when align is active, and enforces the global mesh element size with minimal min/max element size variation.map: sizeKeeps the elements roughly the same size.map: skewPrevents the mesh from producing highly-skewed elements.anchor nodesDesignate nodes that will remain and be re-used in the new mesh. Anchor nodes are fixed so that the automesher cannot move or replace them; in essence, they are exceptions to the re-meshing operation, and the new mesh must utilize them.link opposite edges with AR Links mesh settings on opposing edges of rectangular surfaces. Any changes applied to one linked edge will be applied to the other. A control is available to define the maximum aspect ratio (AR) to allow between large and small edge sizes of linked edges. auto corresponds to a value of 2.11. Increasing the value will add more surfaces to the linked chain, whereas decreasing the value will remove some surfaces from the linked chain. Mesh without link opposite edges with AR selected.Mesh with link opposite edges with AR set to auto.Mesh with link opposite edges with AR set to 8.0.QI OptimizeQuality Index meshing is an iterative automatic mesh generation method driven by element quality criteria. During the mesh generation process, the quality index of the mesh is determined by evaluating each element against a set of element quality tests. If all required element quality criteria are passed, then that element has a perfect quality index of zero. As the element quality deteriorates, the quality index value increases; so a lower quality index score indicates an element more closely meets the ideal quality requirements. The compound quality index sum of the quality index values for each of the elements that are included in the current meshing area. The quality index value itself has no direct physical meaning; it is a way to compare one generated mesh pattern against another pattern generated for that same area. The quality index based mesh optimization routine attempts modify the mesh pattern and apply node smoothing routines to obtain a lower overall quality index value.For more on element quality index, see the Quality Index panel.Panel InputsInputActionentity selectorSet to use surfaces or existing finite elements to define the area to mesh. Extended entity selection options are available to populate the selection.featuresThe automesher will seed nodes along features so as to avoid spreading elements across them. When the entity selector is set to elems, use this switch to determine how the automesher treats features:connected features automatically detects features based on the specified feature angle and make additional effort to void any orphan or non-closed feature lines. It works similarly to auto detect features, but includes a more rigorous check to combine small areas and avoid creating features that end abruptly or do not connect to any other features.auto detect features automatically detects features based on the specified feature angle. In some cases this can create feature edges allows you to pick surface edges in the model to preserve as features.lines allows you to pick lines in the model geometry to preserve as features.element sizeEnter a floating point numeric value for the average element size. The length of any active (shared or free) surface edge will be divided by this number to determine the number of elements to place along that edge. mesh typeSelect quads, trias, mixed, or Quads only to specify the type of element to use in building meshes. Mixed uses quads primarily, but inserts trias when making density transitions, resulting in improved mesh quality. Quads attempts to use quads only-however, at least one tria element must be created if the sum of the element densities around the perimeter of the face or surface is odd. Adjusting the element densities while meshing interactively can usually eliminate all tria elements. Quads only uses a subdividing routine that tends to generate more orthogonal quad elements. Tria elements may still be introduced depending on the density settings as with the quads type.Tria elements uses all-trias to mesh.Use current criteria / Criteria file:Use this toggle to choose between using the current element quality criteria or specifying a criteria file that has been previously created. When set to use current criteria, the green edit criteria button is presented.Edit criteriaThis button only displays when use current criteria is selected, and opens the Criteria File Editor.feature angleSpecify a maximum angle across which elements can be maintained. Any time two adjacent elements normals would exceed this angle HyperMesh creates a new set of nodes between them to maintain clean feature lines. Using a higher value results in elements spanning the feature line:With an appropriate value, the features lines are preserved.If feature angle = is too high, the feature lines are blurred.vertex angleWhen using connected features or auto detect features, this setting is a maximum element vertex angle. Whenever an element vertex exceeds this angle while adhering to features, the element will be split into two elements with correspondingly smaller vertices.Smooth across common edges withcheck this option to allow node smoothing to move nodes across adjacent surface edges whose feature angle is less than the value specified. When this option is active, strict adherence to the geometry of the surface edges in not enforced for non-feature edges; some deviation from the geometry can occur.elems to surf comp / elems to current compSelect the destination component for the newly created elements as the “current” active component or the component to which the surface belongs. The current component is indicated in the component list of the Model browser, or the component status display of the status bar.first order /second orderSet to create first order (linear shape function) or second order (polynomial shape function) elements.connectivitySelect how the connectivity between the newly created elements and any adjacent existing elements will be handled. Choices include:keep connectivity: use the existing nodes on any shared boundary edges.redo connectivity: re-seeds any existing nodes along the boundary of the newly created mesh to optimize mesh quality. break connectivity: ignore any existing adjacent elements and generate the mesh according to the size and type specified.previous settings: re-use any previous node density and spacing settings associated to the selected surface edges. flow: alignProduce a more orthogonal quad-dominant mesh. Only applies to mixed element type. Here, there is no flow alignmentFlow alignment is used, producing straighter rows of elementsflow: align produces a more orthogonal quad dominated meshflow: size appears only when align is active, and enforces the global mesh element size with minimal min/max element size variation.anchor nodesDesignate nodes that will remain and be re-used in the new mesh. Anchor nodes are fixed so that the automesher cannot move or replace them; in essence, they are exceptions to the re-meshing operation, and the new mesh must utilize them.Edge DeviationUse the Edge Deviation subpanel to set specific meshing parameters to limit how far the mesh elements can deviate from the actual edges of the surfaces meshed, or when in the case of re-meshing elements, deviation from inferred edges based on features. Controls for the minimum and maximum allowable element size, edge deviation and maximum angle are introduced with this method. Edge deviation normally occurs on curved edges, because individual elements have straight edges and therefore can only approximate a curve. When meshing curved surfaces as shown here, the planar elements (tan color) can deviate from the curved grey geometry. Edge deviation applies to both surface geometry and when re-meshing elements. Automeshing on the edge deviation subpanel automatically selects the best element size to approximate a curve, within the limits that you specify. The max deviation and max angle settings are the primary controls for this effect. Note:This differs from the size and bias subpanel, which only meshes with elements of a uniform size that you specify.This method can produce a mesh in which the element size varies, even within the same surface. Areas of high curvature will tend to have smaller elements than areas of low or no curvature. The element size boundaries allow you to control this effect. Edge deviation control when meshing creates smaller elements and spaces nodes closer together to limit how much the elements can deviate from the surface edges. Panel InputsInputActionentity selectorSet to use surfaces or existing finite elements to define the area to mesh. Extended entity selection options are available to populate the selection.featuresThe automesher will seed nodes along features so as to avoid spreading elements across them. When the entity selector is set to elems, use this switch to determine how the automesher treats features:connected features automatically detects features based on the specified feature angle and make additional effort to void any orphan or non-closed feature lines. It works similarly to auto detect features, but includes a more rigorous check to combine small areas and avoid creating features that end abruptly or do not connect to any other features.auto detect features automatically detects features based on the specified feature angle. In some cases this can create feature edges allows you to pick surf