icepak网格划分方法 meshing
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▪ As a rule of thumb, the tolerance should be approximately 1/10th of the smallest dimension in the model. This will ensure that any changes in volume will not significantly alter the results.
E-3
源自文库
Meshing steps and considerations
Generate First Cut Mesh Coarse default options with
Max X,Y,Z set to 1/10th or 1/20th of domain size
Examine the Mesh
Both of these meshers can be used to mesh assemblies separately. This will be discussed in more detail later.
Both meshers have the same global and per-object settings.
E-5
Checking during meshing
▪ During the meshing process for the hexahedral meshers, Icepak uses the separation value to check the model.
▪ Icepak calculates the distances between objects in each co-ordinate direction and will align objects where their separation is smaller than the tolerance set.
Refine the Mesh
Generate new Mesh
Re-
No
examine
the Mesh
OKY?es
Solve
Examine mesh using surface plots and cut planes Always check quality using diagnostic Maintain sufficient mesh density to capture physics
Meshing
E-1
Icepak automatic meshing: Overview
Choice of three meshers available: •Two Hexahedral meshers Suited for most (99%) of electronics cooling applications. Unstructured –It can be used for most applications satisfactorily Cartesian
For higher mesh count across an object - use x,y,z count Low and High element size/ratio to refine around objects Inward height/ratio to refine within an object Outward height to refine mesh away from planar objects Background mesh - set Max X, Y, Z sizes Use fluid blocks to refine the mesh locally
• Use coarse mesh for initial solutions and for observing trends • Use suitably refined mesh for final solution
E-4
Hexahedral meshing
Two Hexahedral Meshers Unstructured - Mesh will follow the geometry - Uses all element types to fit the mesh to the geometry - Background mesh is made of hexahedral elements Cartesian - Mesh will be structured mesh consisting only of hexahedral elements - Stair-step approximations to non-rectangular geometry
No parameters set Parameters defined on an object by object basis • After meshing, Icepak loads the mesh and checks the key quality measure, and reports the minimum value in the message window. If there are cells with poor quality, Icepak will automatically display them. • The Key measures are: • Face Alignment for Hexahedral • Aspect Ratio for Tetrahedral
•Tetrahedral mesher Intended for some complex geometry Must be used for ellipsoids, elliptical cylinders, or polygonal ducting
E-2
Automatic meshing
• All the methods are fully automated • Can generate computational meshes at varying levels of complexity
E-3
源自文库
Meshing steps and considerations
Generate First Cut Mesh Coarse default options with
Max X,Y,Z set to 1/10th or 1/20th of domain size
Examine the Mesh
Both of these meshers can be used to mesh assemblies separately. This will be discussed in more detail later.
Both meshers have the same global and per-object settings.
E-5
Checking during meshing
▪ During the meshing process for the hexahedral meshers, Icepak uses the separation value to check the model.
▪ Icepak calculates the distances between objects in each co-ordinate direction and will align objects where their separation is smaller than the tolerance set.
Refine the Mesh
Generate new Mesh
Re-
No
examine
the Mesh
OKY?es
Solve
Examine mesh using surface plots and cut planes Always check quality using diagnostic Maintain sufficient mesh density to capture physics
Meshing
E-1
Icepak automatic meshing: Overview
Choice of three meshers available: •Two Hexahedral meshers Suited for most (99%) of electronics cooling applications. Unstructured –It can be used for most applications satisfactorily Cartesian
For higher mesh count across an object - use x,y,z count Low and High element size/ratio to refine around objects Inward height/ratio to refine within an object Outward height to refine mesh away from planar objects Background mesh - set Max X, Y, Z sizes Use fluid blocks to refine the mesh locally
• Use coarse mesh for initial solutions and for observing trends • Use suitably refined mesh for final solution
E-4
Hexahedral meshing
Two Hexahedral Meshers Unstructured - Mesh will follow the geometry - Uses all element types to fit the mesh to the geometry - Background mesh is made of hexahedral elements Cartesian - Mesh will be structured mesh consisting only of hexahedral elements - Stair-step approximations to non-rectangular geometry
No parameters set Parameters defined on an object by object basis • After meshing, Icepak loads the mesh and checks the key quality measure, and reports the minimum value in the message window. If there are cells with poor quality, Icepak will automatically display them. • The Key measures are: • Face Alignment for Hexahedral • Aspect Ratio for Tetrahedral
•Tetrahedral mesher Intended for some complex geometry Must be used for ellipsoids, elliptical cylinders, or polygonal ducting
E-2
Automatic meshing
• All the methods are fully automated • Can generate computational meshes at varying levels of complexity