Icepak培训上课用的基础教程电子设备热设计IcePakBasicTrainingPPT课件

1、Icepak Basic Training,Training schedule Day 1,Training schedule Day 2,Training schedule Day 3,Overview,1. Overview,Fluent Inc. mission is to provide flow and thermal analysis software and services that give our customers a significant competitive advantage by dramatically improving their designs and

2、 design processes,Fluent Inc. Woldwide,FLUENT 6 General purpose finite volume based CFD package suitable for incompressible/compressible and laminar/turbulent flows, including reacting flows and multiphase flows FIDAP General purpose finite element based CFD package suitable for incompressible lamin

3、ar/turbulent flows involving Newtonian/Non-Newtonian fluids, free surfaces and fluid-structure interaction POLYFLOW Finite element based CFD package suitable for modeling highly viscous flows (as in rheology) and surface flows MixSim Specialized CFD software for modeling mixing processes Icepak Spec

4、ialized CFD software designed for thermal management of electronic packages Airpak Specialized CFD software designed for thermal management of electronic packages,CFD softwares from Fluent Inc.,Icepak is an object-based modeling software It allows you to build your model from: primitive objects such

5、 as blocks, plates, fans, vents, resistances, etc., or Macros such as IC packages, PCBs, radial heat sinks, detailed fan trays, etc.,Icepak: Object-based Software,Steady/ transient problems Laminar/turbulent flows Forced/natural/ mixed convection Multi-fluid problems Internal/external flows Conjugat

6、e heat transfer Radiation heat transfer Fixed/ moving/ symmetry B.C.s Temperature dependent properties,Icepaks capabilities,Icepaks capabilities,Powerful grid generator capable of Unstructured conformal mesh Structured mesh Non-conformal unstructured mesh,Mixed units User defined library of assembli

7、es File imports from MCAD and ECAD packages Direct ProE-Icepak interface Advanced post-processing and reporting,Solution features such as Parameterization Parallel processing Grid-to-grid interpolation Zoom-in-modeling,GETTING STARTED,Topics,How to start Icepak Icepak Graphic User Interface (GUI) St

8、arting a new project Opening an existing project Icepak file structure job, model drag back into the Model branch to make the object active again Empty Trash to permanently delete model objects; post objects are deleted when dragges into trash,Mouse Functions,Mouse Functions: Mouse bindings,In the M

9、odel Tree, expand the Options branch to access the Mouse Bindings,Double click to open the Mouse Bindings and make necessary changes,Model Orientation: Menu and icons,Orient pull down menu with 14 options,Model Orientation: Fixed axes views,Meaning of orient positive x: Orient such that the positive

10、 X axis points normally into the screen; similarly, orient negative X and so on.,Orient positive X,Isometric View,Orient negative Y,Orient positive Z,Model Orientation: Using the mouse,The orientation shown in the figure above was obtained by mouse movements (left: rotation, middle: lateral, right:

11、zoom-in),Model Orientation: Zoom/ un-zoom,Zoom in: drag a box around the region/ objects that need to be zoomed into,Scale to fit: resizes the view such that the cabinet completely fits in the graphics display area; current orientation is retained,Home position: is equvalent to orient negative z and

12、 scale to fit; is the default view when a new model is started,Scale to Fit,Model Orientation: Other options,Reverse orientation - horizontally flips the orientation (mirror image) Nearest axis - changes to the fixed orientation closest to current orientation; useful when orientation is changed usin

13、g the mouse,Save user view saves current orientation under the specified name in the query box Clear user views deletes all user views,Nearest Axis,Model Orientation: Shortcut icons,Home position,Zoom in,Scale to fit,Single display,Partitioned display,Display/hide object names,Interactive tools: Vie

14、w menu,View menu contains several useful tools for: Geometric measurements View options Geometric measurements: Location display point* coords in messages window Distance display dx, dy, dz and distance between selected points* in the messages window Angle display angle between vectors defined by 3

15、points* in the messages window Markers graphic version of Location function Rubber bands graphic version of distance function,*Points should be selected with the mouse following screen instructions,Rubber band,Interactive tools: View menu,View options,Interactive tools: View menu,View options (conti

16、nued),Tracks mouse,“Snap to” grid (not mesh),Interactive tools: Interactive editing form,Recap mouse functions for translating and resizing objects This form controls how these movements are applied Motion allowed movements only in checked directions Restrict to cabinet Objects cannot penetrate each

17、 other Move group with objects,Default mouse translate/resize has continuous movement instead of “grid-digitized” Specify “snap to” grid size for X grid/Y grid/Z grid mouse movement will now be “grid-digitized” Can snap to grid if the grid is made visible through main menu “ViewDisplayVisible grid”

18、New object size factor ratio of new object dimension to corresponding cabinet dimension, default is 0.2; new object will be centered,Model Building: Geometry,3. Model Building: Geometry,Topics,Object Shapes in Icepak Editing functions Alignment functions Units,Shapes in Icepak: Shapes of simple obje

19、cts,3D shapes Prism Cylinder: uniform/ non-uniform Polygon: uniform/ non-uniform Blocks can be Ellipsoid/Elliptical Cylinder,2D shapes Rectangular Circular Inclined rectangular Polygon,Plates,Openings,Grilles,Walls,Fans,Sources,Blocks,Resistances,Heat Exch.,Shapes in Icepak: Altering geometries of o

20、bjects,The shape, position, size and orientation of an object may be modified: Using the Current Object Geometry (COG) window located at the bottom right hand corner of the GUI Using the current objects edit form/ geometry section Geometry of an object includes: Shape, Position and Size Local Co-ord

21、inates Orientation if 2-D,Shapes in Icepak: Object geometry window,Current objects geometric details are displayed in the bottom right hand corner of the GUI Click on Apply or Enter the keyboard after making changes,Current object,Shapes in Icepak: Object geometry window ,Name, Group and Shape,Coord

22、inates may be entered by start/end or start/length,Options to: Apply changes, Reset to defaults, or Edit object form,Shapes in Icepak: Options for 2D shapes,Rectangular,Inclined,Can also be defined by start/angle,Change angle direction,Position defined by co-ordinates of two points on the diagonal,S

23、hapes in Icepak: Options for 2D shapes ,Polygonal,Circular,Options to increase/decrease number of vertices,Select vertex location with mouse,Select options for mouse,Fans can also have an inner radius for the hub,Shapes in Icepak: Options for 3D shapes - Prisms,Regular Prism,Polygons - Uniform (high

24、 and low face identical),Polygons - Non-Uniform (high and low face not identical),Top and bottom faces can have different number of vertices - but must be parallel,Same vertex options as for 2D- polygonal objects,Shapes in Icepak: Options for 3D shapes - cylinders,Uniform Cylinder - no inner radius,

25、Uniform Cylinder - with inner radius,Non-Uniform Cylinder - with inner radii,Inner Radius set to model annulus,Outer and Inner Radii on top and bottom of cylinder can be different,Object Modification,Editing Objects,Opens up the Edit panel for the selected object,Places the selected object(s) in the

26、 trash can,Opens up the Move panel for the selected object(s) From the move panel, you can Scale Mirror Rotate Translate,Opens up the Copy panel for the selected object(s) You can group the copies, and also have same functionality as move available to you,Object Alignment: Icons,Align Face - 1 Dimen

27、sion aligned Plane of Face Matched Align Edge - 2 Dimensions aligned Planes of Edge Matched Align Vertex - 3 Dimensions aligned Centre Object - Based on Centroid Centre Object - Based on Face Centre Match Face - 2 Dimensions Matched Match Edge - 1 Dimension Matched,There are two options Left Click o

28、n Icon Object gets re-sized during alignment Right Click on Icon Object size is preserved object is moved during alignment Can also use edit/alignment tools instead of icons,Object Alignment : Icons ,Object Alignment : Icons ,The alignment tools all work in the same way Click on Icon or select from

29、menu Choose the face/edge/vertex that you want to change with the LEFT MOUSE BUTTON The selection will be highlighted - if the wrong one was selected, then just click again and Icepak will select the next face/edge/vertex Once you have the correct selection use MIDDLE MOUSE BUTTON Then select the fa

30、ce/edge/vertex with which to align/match using the LEFT MOUSE BUTTON Upon correct selection accept with the MIDDLE MOUSE BUTTON Instructions for the above steps are given in red in the bottom left hand corner of the display area At any point you can cancel the operation with the RIGHT MOUSE BUTTON,O

31、bject Alignment: Coordinate snapping,Using Co-ordinate alignment: Next to the co-ordinates of the geometry in the COG there are options to snap that co-ordinate to an existing point on an edge in the model. Co-ordinates can be: Start (xS,yS,zS) End (xE,yE,zE) Length (xL,yL,zL) Centre (xC,yC,zC) Vert

32、ex,To Use: Click on the “Orange” panel for a co-ordinate, and then with the mouse click on a point in the model. Icepak will then set that co-ordinate value to the position selected.,Editing Objects: the Edit Form,The current objects edit form can be opened in the following ways Double clicking the

33、object in the tree Right clicking the object in the tree and selecting “Edit object” from the pull down menu Select the object in the tree and click the “Open edit form” icon in the vertical Model Toolbar From the main menu, picking “Edit/ Current object/ Edit” Using the keyboard short-cut ctrl+lowe

34、rcase e,4 Sub-forms,Options Common to All Sub-Forms,Editing Objects: Geometry Sub-Form,Contains all geometric information: Shape Local Co-ordinate system (if any) Orientation Location,Create new local origin,Check local origin,Edit a local origin,Select local origin from existing ones,Pull Down Menu

35、,Editing Objects: Properties Sub-Form,Contains all flow/thermal properties:,Object type - eg: Thermal model Block Type,This area contains: Solid/Fluid and surface material specification Boundary conditions flow rates, power generation, temperature Side specification Any additional information requir

36、ed to implement the selected object type (eg: thickness),Editing Objects: Info and Notes Sub-Forms,Notes Any relevant additional information user may want to add,Info Name Creation Priority Shading etc.,Units,Physical quantities can be specified in various different units Examples:,Length,Temperatur

37、e,Flow rate,Conductivity,Power,Units: Global Units,Every quantity (length/mass/etc) in Icepak has a default global unit To change the global unit for a quantity go under the Model Tree/ Options/ Unit Definitions and follow the steps shown below,Units of a quantity may be changed at any time during m

38、odel building When global units are changed, the new units are applied to new objects created after the change existing objects will continue to use the previous units,Units: Object Specific Units,Model Building: Icepak Objects,4. Model Building: Icepak Objects,Topics,Simple Objects,No flow objects

39、Cabinet (default) Walls Blocks Plates Sources,Flow objects Openings Grille Volumetric Resistances 2D - Fans Heat Exchangers,Materials Solid Fluid Surface,Composite Objects,3D Fans Enclosures PCBs Assemblies,Heat Sinks Packages Networks,Creating New Objects,Ways to create and position objects in Icep

40、ak Click on object icon and edit it, or use the alignment tools to create it Drag the object icon into graphics display area If using this option, it is sensible to set a “snap” grid in Options/Interactive menu to ensure that re-location/positioning is limited to the snap grid. For example you may s

41、et the snap to 1mm then position is limited to nearest mm Change object type etc.,To change properties of an object Select the object Enter changes in the object edit form discussed in the previous section,Defines the computational domain it is always cuboidal shape Exists by default when a new mode

42、l is started Default dimensions: 1 x 1 x 1 m3 (or equivalent in other units) Default for new objects - they will be 1/5th the cabinet size and centered No object may wholly or partly exist outside the cabinet a warning message will prompt the user for an action as in the figure below,Undo the operat

43、ion that caused the object to go out of cabinet,Object can remain outside temporarily, but this message will reappear,Autoscale button in the cabinet form or COG resizes the cabinet to just fit all objects in the model Scaling/moving the cabinet using the move form scales/moves the entire model,Cabi

44、net,Cabinet: Properties,Default cabinet properties: Walls are adiabatic Walls have zero velocity,Overcome these constraints by placing following objects on cabinet sides: walls energy transfer only openings, vents and fans flow and energy transfer The cabinet form lets you impose any of these object

45、s on the entire side(s) of the cabinet these objects will automatically resize when the cabinet size is changed,Walls,Can only be placed on cabinet sides or on faces of hollow blocks Inner side of walls see the fluid, while outer sides face the exterior conditions,Three Types: Stationary Symmetry Mo

46、ving,Wall thickness may be real or effective External material is always specified Solid and internal surface are specified only for walls with thickness,Solid material,Surface materials,Default Icon:,Default color: Grey,Walls: Thermal data,Default Icon:,Default color: Grey,Stationary walls may have

47、 heat transfer specification to the outside Outside heat flux Outside temperature External conditions/ heat transfer coefficient,Symmetry walls - reduce model size when the model is symmetric about a plane Adiabatic and Frictionless Zero flux and flow through wall,Can specify spatially varying profi

48、le,Moving walls - account for motion in the plane of the wall Thermal inputs of stationary walls Wall velocity vector,Blocks,Default Icon:,Default color: Pink,Can be meshed with either Mesher,Must be meshed with Tetrahedral -Mesher,Blocks: Thermal models,Default Icon:,Default color: Pink,4 Thermal M

49、odels,Hollow blocks No mesh within the block no equations solved inside hollow block No heat conduction in the planar direction along the sides of the block,Hollow Polygon blocks used to modify domain,Uses of hollow blocks: Mask off regions of the domain Simplified representation of modules,Blocks:

50、Thermal models,Default Icon:,Default color: Pink,Solid blocks Versatile uses- can be used for almost any solid component Openings/fans/vents will cut through solid blocks if their dimensions are smaller than the block Fluid blocks - uses Multi-fluid models Carve out portions from solid blocks Networ

51、k blocks Hollow block with thermal resistance network inside the block 4 Types of networks (Two resistor, Star, Shunt and General) Network values visible upon selecting block Uses of network blocks: Simplified representation of packages/ prismatic components with heat generation,Blocks: Thermal data

52、,Default Icon:,Default color: Pink,Surface data all block types Radiation Discussed Later Individual Side Specifications Thermal Properties - Total Power, Flux or Fixed Temperature Heat transfer coefficient to model conductance per unit area contact resistance Radiation specification for a side,Bloc

53、ks: Thermal data,Default Icon:,Default color: Pink,Thermal data - Solid and fluid blocks Material specification Total power uniform through the volume Power options temperature dependence, Joule heating, transient power Note: In multi-fluid problems, fluid blocks must not have a common interface Net

54、work blocks Mark the board side Junction power Resistance values Hollow blocks Adiabatic inside and on surface No Heat Transfer to other objects,Plates,Default Icon:,Default color: Orange,6 Thermal models: Conducting thick for compact PCBs, solid objects with small thickness Conducting thin for soli

55、d objects with small thickness, thin layers (gives reduced mesh count) Contact resistance for adhesives, interface materials Adiabatic thin for baffles, non-conducting enclosures Hollow thick and Fluid identical to hollow blocks and fluid blocks,Surface thermal data: Only 2 faces available cannot sp

56、ecify data for the “edge faces” Heat transfer coefficient/ contact resistance can be specified No power on individual sides Local Radiation controls,Plates: Thermal models,Default Icon:,Default color: Orange,Conducting thick: Plate thickness is modeled and meshed Power options constant, temperature

57、dependence, Joule heating, transient power,Conducting thin: Plate thickness is effective only no mesh in the thickness Conduction in both the in-plane and through plane directions Constant power option,Contact resistance: Plate thickness is effective only Conduction in the through-plane direction on

58、ly Constant power option,Adiabatic thin: No plate thickness Plate surface is adiabatic no heat transfer or power generation,Hollow thick: Identical to hollow block except surface data can be specified in only 2 faces,Fluid plate: Thickness is modeled and meshed No power specification or surface data

59、 Used to punch through a thick plate,Solid Blocks vs Solid plates,Following are differences between solid models of blocks and plates,Sources,Default Icon:,Default color: Green,Sources can have 2D or 3D shapes Source material = material of the object it is mounted on / in No Flow across the face of

60、a 2D source 2D Sources can also radiate Power can be specified as total power/ power density/ fixed temperature Power flux (2D sources) can be specified as a spatially varying profile (x,y,z,value) Total power can be temperature dependent with in a specified source temperature range eg: power = 3.0