1. © Fluent Inc. 10/15/20151-1 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Introduction to GAMBIT

2. © Fluent Inc. 10/15/20151-2 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Agenda Day 1 8:00 Introduction + Demo 9:15 Tutorial 1: Creating and Meshing Basic Geometry 9:45 Creating Geometry in Gambit 10:45 Tutorial 2: Geometry Creation Exercises 12:00 Lunch 1:00 Edge/Face Meshing and Mesh Quality 2:00 Tutorial 3: Edge and Face Meshing Exercises 2:45 Volume Meshing and the Sizing Function 3:45 Tutorial 4: Volume Meshing and Sizing Function Exercises 4:30 Volume Decomposition Examples 5:00 Break for the Day

3. © Fluent Inc. 10/15/20151-3 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Agenda Day 2 8:00 Tutorial 5: Volume Decomposition Exercises 8:45 Mesh Control through Boundary Layers and Face Vertex Types 9:30 Tutorial 6: Vertex Types 10:30 CAD/CAE Import and Geometry Cleanup + Demo 11:30 Tutorial 7 or 8: Geometry Import Exercise 12:00 Lunch 1:00 Tutorial 7 or 8: Continued 1:30 Tutorial 9: Hex meshing the Flow Probe 3:00 Work on your own Project 1:00 Tutorial 7 or 8: Continued 1:30 G/Turbo + Demo 3:00 Work on your own Project 5:00 Break for the Day or

4. © Fluent Inc. 10/15/20151-4 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com What is GAMBIT ?  A single, integrated preprocessor for CFD analysis: Geometry construction and import Using ACIS solid modeling capabilities Using STEP, Parasolid, IGES, etc. import s Cleanup and modification of imported data Mesh generation for all Fluent solvers (including FIDAP and POLYFLOW ) Structured and Unstructured hexahedral, tetrahedral, pyramid, and prisms. Mesh quality examination Boundary zone assignment

5. © Fluent Inc. 10/15/20151-5 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Operation  General sequence of operations Initial setup Solver selection, Mesh size, Defaults, etc. Geometry Creation (ACIS, STEP, Parasolid, IGES or Mesh import) Create full geometry Decompose into mesh-able sections Meshing Local meshing: Edge and Boundary layers Global meshing: Face and/or Volume Mesh examination Zone assignment Continuum and Boundary attachment Mesh export

6. © Fluent Inc. 10/15/20151-6 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Files (1)  GAMBIT directory and files When GAMBIT starts up, it creates a directory called GAMBIT.# # = the process number It also creates a “lock” file, ident.lok, in the working directory ident.lok prevents any user from starting up another session using the same identifier in the same directory. If the code crashes, this file needs to be manually removed. Three files are created inside this directory ident.dbs = jou = trn = the database. All information will be saved in this file. This file is NOT retrievable upon a crash the journal file. This file is directly accessible from the Run journal form the transcript file. Output from GAMBIT

7. © Fluent Inc. 10/15/20151-7 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Files (2)  GAMBIT directory and files GAMBIT permanently saves these files to your working directory as ident.dbs, ident.jou and ident.trn anytime you issue a “Save” option (equivalent to any standard word processor) Upon Save, earlier versions of ident.dbs and ident.trn will be overwritten, while new commands are appended to the file ident.jou Upon successful exit of GAMBIT : The directory GAMBIT.# is removed The lock-file ident.lok is deleted

8. © Fluent Inc. 10/15/20151-8 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Startup: DEMO  Start gambit with “gambit filename” NT Users must start Gambit this way from a command prompt.  Example: Start Gambit in directory “projects”  > gambit airfoil Before save After save

9. © Fluent Inc. 10/15/20151-9 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Journal Files  Journal File: Executable list of Gambit commands Created automatically by Gambit from GUI and TUI. Can be edited or created externally with text editor. Journals are small - easy to transfer, e-mail, store  Uses: Can be parameterized, comments can be added Easy recovery from a crash or power loss edit existing commands to create new ones

10. © Fluent Inc. 10/15/20151-10 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Running Journal Files  Journal files can be processed in two ways: Batch mode (Run) All commands processed without interruption. “read pause” command will force interrupt with resume option appearing. Interactive mode (Edit/Run) Includes text editor for easy modifications s Mark lines in process field to activate for processing. s Editable text field. s Right click text field for more options. s Auto or Step through activated process lines.

11. © Fluent Inc. 10/15/20151-11 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Journal File: Parametric Modeling  Parameters (incl. arrays), control-blocks, do-loops, arithmetic functions, etc., can be used in the Journal File for simplifying parametric studies. Comment lines Parameter names begin with $ Commands are not case sensitive

12. © Fluent Inc. 10/15/20151-12 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com GUI Main Menu bar Global Control Operation toolpad Command line Description window

13. © Fluent Inc. 10/15/20151-13 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Operation Tool Pads Vertex Edge Face Volume Group Boundary Layer Edge Face Volume Group Boundary Types Boundary Entity Continuum Types Continuum Entity Coordinate Systems Sizing Function G/Turbo User-Defined Tools

14. © Fluent Inc. 10/15/20151-14 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com File Menu (1)  New, Open, Save, Save As and Exit Standard form of database operations  Print Graphics Prints graphics to printer or to file PostScript, BMP, TIF, etc.  Run Journal / Clean Journal Screen editor/command processor for journal files Command processing: Partial or global selection/de-selection Automatic or stepwise processing Ability to load the current journal File browser Clean Journal removes unnecessary tags, undo’s, etc.

15. © Fluent Inc. 10/15/20151-15 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com File Menu (2)  View File View of the current output, ident.trn, the transcript file Ability to view other files as well  Import ACIS, Parasolid - IGES, STEP ICEM Input, Vertex Data CAD - Pro/E, Optegra Visualizer, I-DEAS FTL Mesh - mesh and faceted geometry files.  Export ACIS, Parasolid IGES, STEP Mesh - Export your mesh for your Solver. 2D option guarantees 2D mesh

16. © Fluent Inc. 10/15/20151-16 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Edit Menu (1)  Edit Title Title will be included on any printed graphics  Edit File Ability to launch an editor within GAMBIT  Edit Parameters Ability to define, modify and list parameters parameters:$numeric = 10, arrays:$array(3,4) = 5 Parameters and arrays can also be directly defined in the journal file using an editor (preferred option)

17. © Fluent Inc. 10/15/20151-17 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Edit Menu (2)  Edit Defaults Modify a large range of defaults that effect: User Environment Meshing Characteristics Geometry Ability to load, modify and save a new set of defaults in $HOME/GAMBIT.ini which is loaded automatically at startup.  Undo/Redo Ten levels of undo/redo (default) Reducing number of levels also reduces memory requirements.

18. © Fluent Inc. 10/15/20151-18 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Solver Menu  The Solver selection will have an impact on the following input forms: Available meshing algorithms Available element types Continuum types Boundary types Export mesh file

19. © Fluent Inc. 10/15/20151-19 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Graphical User Interface  Command : Input of (non-GUI) commands, e.g., reset : deletes all mesh and geometry in the current model reset mesh : deletes mesh, keeps geometry  Description Gives a short description of all global function buttons and screen areas  Transcript Output from GAMBIT is printed here as well as in ident.trn Transcript window can be expanded using arrow button in top right corner

20. © Fluent Inc. 10/15/20151-20 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Global Control (1)

21. © Fluent Inc. 10/15/20151-21 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Global Control (2)  Scale-to-fit resizes the model to fit the screen  Orient Model - major axes, isometric and: Reverse Previous Journal view  Select Pivot - around which the model rotates, zooms Body center Mouse position  Model display attributes Turn on/off visibility, label, silhouette, mesh and hidden line on all or selected geometrical entities  Preset configuration of the graphics window 4-view and 4-split Options to return to any single view

22. © Fluent Inc. 10/15/20151-22 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Global Control (3)  The Window Attributes form Modify the following attributes (defaults given) RenderWireframe on ; shaded and hidden off MeshVolume - off Silhouette All on LabelAll off Visibility All on Two ways of picking entities “All” - All entities are picked (Default) “Pick” - Individual picking including the use of pick lists

23. © Fluent Inc. 10/15/20151-23 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Global (4)  Render Model - Wireframe, Shaded, Hidden  Modify Light/Label type Change light source orientation and properties Additional information on the entity label Insert arrows and text for graphic presentations  Color Mode Color by entity Color by connectivity  Undo/Redo  Examine Mesh Display different element types by quality, plane cuts, etc.

24. © Fluent Inc. 10/15/20151-24 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Forms (1)  Form - components List box - (picking) active (yellow) - ready to pick inactive (white) - click to activate Radio buttons mutually exclusive options Option button Option menu Text box Click-to-focus Check box non-mutually exclusive options Command buttons

25. © Fluent Inc. 10/15/20151-25 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Forms (2)  Text box Field for input of data, expressions, parameters The cursor is blinking if active To activate - left click in the text box (click-to-focus) Forms with several text boxes The order of input is not important Use “tab” to go to the next text box Use left click (click-to-focus) to go to any text box

26. © Fluent Inc. 10/15/20151-26 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Forms (3)  List box Highlighted in yellow if active To activate - left click in the list box Tells you the name of the latest picked item The item is highlighted in red on the screen All previously picked items are pink Individual pick lists for each list box Forms with several list boxes: Depending on the form, the order of picking may be important Use Shift right-click to go to the next list box Use left click (in the list box) to go to any list box

27. © Fluent Inc. 10/15/20151-27 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Forms (4)  Pick Lists Open the Pick List by clicking on the arrow The “Available” list is sorted in the order of picking Pick List functionality: Pick or Un-pick, Selected or All entities by highlight in left column and by clicking on the arrows Highlighted “picked” entities will appear red on the screen s edge.32, edge.33 Non-highlighted “picked” entities will appear pink s edge.26, edge.28 Right-click in lists area provides additional options Filter can be used to control which objects are picked.

28. © Fluent Inc. 10/15/20151-28 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Mouse Operations (1) You can toggle between picking with or without “Shift”: Keep right mouse button down while doing a “left-click” The cursor now changes to another symbol Now, Pick/Next/Accept do not need a “Shift” The Rotation/Translation/Zoom now needs a “Shift”

29. © Fluent Inc. 10/15/20151-29 Introductory GAMBIT Notes GAMBIT v2.0 Jan 2002 Fluent User Services Center www.fluentusers.com Mouse Operations (2)  The picking philosophy: Left - Middle - Right Shift-Left: initial pick Alternative: click and hold, drag diagonally to pick several items at the same time - “window picking” The latest pick is highlighted in red, previously picked items are highlighted in pink Shift-Middle: modify pick The middle pick will behave differently depending on the mouse location: s Same:Cycle to the next available object within picking tolerance s New:Replace last pick with new pick at new location s Bad:A Shift-Middle pick on “nothing” is equivalent to “Un-select last pick” Shift-Right: Apply or go to the next list box