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Introductory GAMBIT Notes

GAMBIT v2.1 Jul 2003

Introduction to GAMBIT

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What is GAMBIT?

Geometry And Mesh Building Intelligent Toolkit

A single, integrated preprocessor for CFD analysis:

Geometry construction and import

Using ACIS solid modeling capabilities

Using STEP, Parasolid, IGES, etc. import 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

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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, Boundary layers and Size Functions

Global meshing: Face and/or Volume

Mesh examination Zone assignment

Continuum and Boundary attachment

Mesh export

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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 crashthe journal file. This file is directly accessible

from the Run journal form

the transcript file. Output from GAMBIT

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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

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Startup: DEMO

Start gambit with

"gambit filename"

NT Users must

start Gambit this

way from acommand prompt.

Example: Start

Gambit in directory

"projects"

> gambit airfoil

Before save

After save

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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

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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

Mark lines in process field

to activate for processing.

Editable text field.

Right click text fieldfor more options.

Auto or Step through

activated process lines.

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GUI

Main Menu bar

Global Control

Operation toolpad

Command lineDescription window

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Operation Tool Pads

Vertex

Edge

Face

Volume

Group

Boundary Layer

Edge

Face

Volume

Group

Boundary Types

Continuum Types

Coordinate Systems

Sizing Function

G/Turbo

Geometry Cleanup

User-Defined Tools

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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.

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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, Catia V4 -add on)

ICEM Input, Vertex Data

CAD - Pro/E (STEP or DIRECT- add on), Optegra

Visualizer, I-DEAS FTL

Mesh - mesh and faceted geometry files. Export

ACIS, Parasolid

IGES, STEP

Mesh - Export your mesh for your Solver.

Export 2D Mesh option guarantees 2D mesh

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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 inthe journal file using an editor (preferred option)

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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.iniwhich is loaded

automatically at startup.

Undo/Redo

Ten levels of undo/redo (default) Reducing number of levels also reduces memory

requirements.

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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

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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

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

Description

Gives a short description of all global function buttons and screen areas

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Global Control (1)

Scale-to-Fit Pivot anchor for

view

manipulation

Four split

Four view

Light source

Special Labels

Annotate

Undo/Redo

Orient Model

Journal View

Modify (on/off)

LabelVisibility

Rendering

Show mesh

Silhouette

Wire frame

ShadeHidden Line

Color coding

Entity typeConnectivity

Examine Mesh

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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

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Global Control (3)

The Window Attributes form

Modify the following attributes (defaults given)

Render Wireframe on ; shaded and hidden off

Mesh Volume - off

Silhouette All on Label All off

Visibility All on

Two ways of picking entities

"All" - All entities are picked (Default)

"Pick" - Individual picking includingthe use of pick lists

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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.

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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

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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

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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

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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

edge.32, edge.33

Non-highlighted "picked" entities will appear pink

edge.26, edge.28 Right-click in lists area provides additional options

Filter can be used to control which objects are picked.

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Mouse Operations (1)

Left Middle Right

Drag x-y rotation Translation Zoom/ z-rotation

Shift +Click

Pick Next Accept/Next picker

DoubleClick

Previous View Save view to journal

Ctrl Drag zoom Stretch zoom Click points to grid

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"

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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"

Upward diagonal picking will include everything fully included in the box

Lower diagonal picking will include everything partially included in the box

The latest pick is highlighted in red, previously picked items are highlighted in pink

Picking Five FacesPicking One Face

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The picking philosophy: Left - Middle - Right

Shift-Middle: modify pick

The middle pick will behave differently depending on the mouse location:

Same: Cycle to the next available object within picking tolerance

New: Replace last pick with new pick at new location

Bad: A Shift-Middle pick on "nothing"is equivalent to

"Un-select last pick"

Shift-Right: Apply or go to the next list box

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