Geometry Modeling Grid Generation

[Pages:132]Geometry Modeling &

Grid Generation

ME469B/2/GI

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Geometry Modeling & Grid Generation

? Geometry definition (simple shapes, CAD import) ? Grid generation algorithms ? GAMBIT ? Grid quality and improvement ? Automation

ME469B/2/GI

Acknowledgements: Fluent Inc. Gambit User Manual S. Owen: Introduction to unstructured mesh generation

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Simulation Process

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1. Build CAD Model

2. Mesh

3. Apply Boundary Conditions

4. Computational Analysis

ME469B/2/GI

5. Visualization

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Adaptive Simulation Process

User supplies meshing

p aramet ers

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1. Build CAD M odel

2. M esh

3. Apply Boundary Conditions

Adaptivity Loop

4. Computational Analysis

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Error?

Error >

5. Error Estimation

Analysis Code supplies meshing

p aramet ers

6. Remesh/Refine/Improve

Error <

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7. Visualization

Geometry

Mesh Generation

Geometry Engine

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Grid generation package: GAMBIT

File I/O

Defaults

Grid Format

Graphics Window

Special Geometry Grid BC Tools

Geometry Tools Volume Tools

Text Window

ME469B/2/GI

Visualization Tools

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GAMBIT

gambit -id Interactive execution with GUI

gambit -inp Batch execution without GUI

Batch and GUI execution are EXACTLY equivalent!

Geometry & Grid are saved in a database file (*.dbs) The mesh is saved into a solver-dependent file (*.msh) At the end of each session Gambit automatically saves a journal file (*.jou)

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vertices: x,y,z location

Geometry

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