icepak-meshing-网格划分解析

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Hexahedral meshing
结构化网格 非结构化网格

台阶状近似几何 不正确的几何面积 远场网格不得不加密 网格数量多，精度差
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真实几何 正确的几何面积 只在需要的地方加密网格 网格数量少，精度好
Hexahedral meshing:structured and unstructured
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Global settings (1)
Normal Mesher – Provides an acceptable mesh for most situations Coarse Mesher – Provides a coarse mesh Mesher default settings include: Min elements in fluid gap - Minimum number of cells in between adjacent faces
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Default settings
Mesher Type Hexa-Unstructured, Hexa-Cartesian, Tetrahedral,mesher-hd(hexdominant mesher六面体核心网格) 只有六面体核心网格才能对CAD objects进行网格划分 Max X, Max Y, Max Z Control the size of the largest cell allowable in the background mesh Object Params Individual parameters
• Use coarse mesh for initial solutions • Use suitably refined mesh for final solution
Solve
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Hexahedral meshing
Two Hexahedral Meshers Unstructured - Mesh will follow the geometry Cartesian - 六面体单元组成的structured mesh - 对非矩形几何模型划分Stair-step(阶梯状) approximations
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Recommendations
Max X, Y, Z By default this is 1/20th of the cabinet dimensions 1/10th of the domain size is sufficient for a coarse grid 不推荐使用小于1/20th domain size,可能生成大量不必 要的网格 Init Height Recommended that you do not set this on large models as it can result in very large mesh counts
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Meshing steps and considerations
default options with Max X,Y,Z set to 1/10th or 1/20th of domain size
Examine the Mesh
Examine mesh using 物体的surface plots and cut planes use x,y,z count 对物体进行划分
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Hexahedral meshing: Generation panel
包括 generate, Display, Check quality, and Export
Default Settings mesher type, background mesh settings
Global Settings for refining mesh
Refine the Mesh
设定物体周围的Low and High element size/ratio Inward height/ratio to refine within an object
set Max X, Y, Z sizes
Generate new Mesh
No
Reexamine the Mesh OK? Yes
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Icepak automatic meshing: Overview
Two Hexahedral meshers Unstructured Cartesian Tetrahedral mesher 专门使用于 some complex geometry Must be used for ellipsoids, elliptical cylinders, or polygonal ducting
5. Meshing
Meshing
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Icepak automatic meshing: Overview
先进的网格技术
Fully automatic 完全自动化的网格生成 Local and global controls 局部和总体控制 Hexahedral or Tetrahedral meshes 六面体/四面体 先进的非结构化网格 先进的non-conformal mesh
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Automatic meshing
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All the methods are fully automated 可以进行不同复杂程度的网格划分 No parameters set Parameters defined on an object by object basis After meshing, Icepak checks the key quality measure.If there are cells with poor quality, Icepak will automatically display them. The Key measures are: Face Alignment for Hexahedral(面扭曲率) Aspect Ratio for Tetrahedral(长宽比)