FEM MeshRegion/ru

FEM mesh boundary layer

FEM mesh group

FEM

Область сетки МКЭ
Системное название
FEM MeshRegion
Расположение в меню
Mesh → Область сетки МКЭ
Верстаки
FEM
Быстрые клавиши
Нет
Представлено в версии
-
См. также
FEM tutorial

Описание

Enables the user to set a localized set of meshing parameters by selecting a set of elements (vertex, edge, face) and applying the parameters to it. It is especially useful for refining meshes in areas of interest or areas where the solver will generate a stronger gradient of a variable. For example, it can be used to refine the mesh around stress-risers (sharp edges, holes, notches, ...) in mechanical analysis, or at areas of contraction in a fluid flow.

Refining the mesh has the advantage of enabling accurate simulation where needed, while allowing coarser mesh in the wider domain, thus drastically optimizing the computation time while maintaining meaningful solutions output.

Применение

1. To enable the function a FEM mesh from shape by Gmsh must be first provided. Select the Mesh object in the Model Tree and either press the FEM mesh refinement button or use the Mesh → FEM mesh refinement menu option.
2. Press the Add button and select one or more of either faces, edges or vertices in the 3D view to apply the mesh refinement to. The selected items will appear in the list of geometrical objects. The selection mode can be also set to Solid.
3. Enter the maximum element size for the region.
4. Click the OK button.
5. Close the task.

   Result: You now should see a new FEMMeshRegion object under the FEMMeshGMSH object (see example #3 below) in your active analysis container.

6. Double-click on the FEMMeshGMSH parent object in your Model Tree and press Apply to force a mesh recalculation.
7. Close the task.

After the mesh has been created, you can change its properties using the property editor. After you change a property, you must reopen the Gmsh dialog again and click the Apply button (you can leave the dialog open while changing properties).

You can create as many different mesh regions as needed.

Visual examples

Example 1: The initial coarse FEM Mesh by GMSH

Example 2: After applying a Mesh refinement using two FEM Mesh Region objects, the large hole is refined to a maximum element size of 3 mm, the smaller hole is refined to 1 mm

Example 3: A simple example of the resulting Model Tree

Примечания

Порядок, в котором области отображаются в Древе проекта, может изменить результат сетки. См. Эту ветку форума.

Related

• "Mesh Regions for a Better Analysis" - Video Tutorial by Joko Engineering (link)

FEM mesh boundary layer

FEM mesh group

FEM

FEM

• FEM Analysis

• Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor

• Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)

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Constraints

• Electromagnetic: Electrostatic potential, Current density, Magnetization

• Fluid: Initial flow velocity, Initial pressure, Flow velocity

• Geometrical: Plane rotation, Section print, Transform

• Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight

• Thermal: Initial temperature, Heat flux, Temperature, Body heat source

• Overwrite Constants: Constant vacuum permittivity

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• Mesh: Mesh Netgen, Mesh GMSH, Mesh boundary layer, Mesh region, Mesh group, Nodes set, Mesh to mesh

• Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run

• Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box

• Utilities: Clipping plane, Remove clipping planes, Open FEM examples; Mesh clear, Mesh display info

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• Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types

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