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1、Non-Conformal Meshing,A non-conformal mesh is one where there is transition from many cells to one cell In Icepak, assemblies of objects can be meshed non-conformally A “slack” or envelope can be defined around a particular assembly and the resulting region is meshed independent of the mesh outside
2、This enables embedding a fine mesh within the assembly sub-region without leading to cell bleeding, while the model outside the assembly has a course mesh,Non-Conformal meshing - Assembly,The first thing to do is to edit the assembly, and turn on the option to mesh separately. Next, add a “slack” re
3、gion around the assembly By default the bounding box of the assembly is the min/max extents of the objects making up the component Slack region allows the user to re-define the bounding box, to make it slightly larger than the objects making up the component.,Assembly defining slack,The assembly bou
4、nding box must have sufficient slack so that its sides do not touch any Icepak object Cabinet, walls and hollow block are the only objects that may touch the sides of a non-conformally meshed assembly All objects except conducting thin plates and hollow blocks can intersect an non-conformal assembly
5、 the portion within will be meshed non-conformally Any object can lie completely within the non-conformal assembly even though it may not be a part of the assembly,Rules for non-conformal meshing (1),For example, in this model a 1U heat sink design is modelled as an assembly By default the bounding
6、box would be the the size of the base in the x-z dimensions, and extend to the top of the fan casing. Where the fins touch the default bounding box, there would be a solid cell on the internal side of the interface, and a fluid side on the outside of the interface - this is currently not allowed by
7、the solver Adequate slack must be specified, as in the figure below, so that the assembly bounding box does not touch the heat sink fins After specifying the slack the assembly can cut through a solid or fluid object, as the PCB is cut in this example,Rules for non-conformal meshing (2),Multiple ass
8、emblies can be meshed separately provided: Assemblies are not be embedded within each other In this instance, choose not to mesh the embedded assembly separately. Then it will be included in the non-conformal interface of the larger assembly. Assemblies do not touch So the bounding box of one assemb
9、ly cannot share a surface with the bounding box of a second assembly Assemblies do not intersect,Rules for non-conformal meshing (3),In this example, either the TO220 can be meshed separately, or the heat sink can be meshed separately, as the bounding box for the TO220 lies inside that for the heat
10、sink The best option here, is to mesh the heat sink separately,Bounding box for Heat Sink,Bounding box for TO220,Example:,Once the regions have been defined for each assembly, then under the meshing panel, turn on the option to mesh assemblies separately. Icepak will then mesh the model and embed a finer mesh on the assembly region. Both the H
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