OpenFOAM Workshop

Yağmur Gülkanat

Res.Assist.

Introduction to OpenFOAM

What is OpenFOAM?

• FOAM = Field Operation And Manipulation

• OpenFOAM is a free-to-use open-source numerical simulation software with

extensive CFD and multi-physics capabilities

• Free-to-use means using the software without paying for license and support,

including massively parallel computers: free CFD license!

• Toolbox for Computational Mechanics, primarily CFD

• Open-source, written in C++

• Generic and programmable

• Solves of discrete partial differential eqns on unstructed grids

• Finite volume, finite element, lagrangian particle tracking, and more..

23.01.2014Introduction to OpenFOAM 2

Two development lines for OpenFOAM

23.01.2014Introduction to OpenFOAM 3

OpenCFD Ltd. (2004)

acquired by SGI (2011)

Led by Henry Weller

openfoam.com

Wikki Ltd. (2004)

Led by Hrvoje Jasak

Extend Project

extend-project.de

History

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• Late 1980’s: Imperial College, Prof. David Gosman’s research group

• 1996: H. Jasak. PhD Thesis, Imperial College, University of London (1st PhD thesis on OF)

• 2000-2004: Nabla, Ltd, markets commercial product, FOAM

• 2004: Nabla makes OpenFOAM GPL

• 2004: OpenCFD, Ltd (Henry Weller) and Wikki, Ltd (Hrv Jasak)

• Jan 2006: 1st OpenFOAM Workshop

• Nov 2007: 1st OpenFOAM Conference (Open-source CFD Conference)

• 2009: FOAM Documentation Project was shut-down

• Aug 2011: SGI purchases OpenCFD, Ltd.

• Sep 2012: ESI Group purchases OpenCFD from SGI

Capabilities

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• OpenFOAM is a CFD Toolbox written in C++

Software :

Liberal use of C++ abstraction

Run-time selection of libraries

Five basic classes

Libraries : Numerical algorithms and physical models

Utilities: Meshing, pre-processing, parallel computing, post-

processing, etc.

Solvers : Designed for specific classes of problems, e.g.,

incompressible flow, compressible flow, multiphase flow, etc.

File Structure

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Applications = Solvers + Utilities

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eg. CFD, Stress Analysis etc. eg. Meshing, case setup, solution monitoring, data export etc.

Solvers

For solving a specific continuum mechanics problem with a specific

system of PDEs.

Utilities

For performing tasks that involve data handling and

manipulation

Location of applications’ source code

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utilities

• contains the source code of the utilities

test

• contains the source code for testing specific features of OpenFOAM

solvers

• contains the source code of the solvers

Allwmake

• used to compile all the applications

Solvers in OpenFOAM

Solvers in OpenFOAM

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Frequently Used Standart Solvers

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Frequently Used Standart Solvers

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Frequently Used Standart Solvers

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icoFOAM Solver

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Utilities in OpenFOAM

Utilities in OpenFOAM

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Frequently Used Standart Utilities

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Frequently Used Standart Utilities

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Frequently Used Standart Utilities

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Frequently Used Standart Utilities

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A Simple Example

The Lid-driven Cavity Tutorial

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Problem Contents

• Overview: Description of the problem

• Part 1: Mesh Generation

• Part 2: Initial & Boundary Conditions

• Part 3: Setting Physical Properties

• Part 4: Solver Control

Overview: Description of the Problem

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Overview: Description of the Problem

23.01.2014A Simple Example 21

Part 1: Pre-processing

23.01.2014A Simple Example 22

Part 1: Pre-processing

23.01.2014A Simple Example 23

Part 1: Pre-processing

23.01.2014A Simple Example 24

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 25

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 26

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 27

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 28

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 29

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 30

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 31

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 32

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 33

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 34

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 35

Part 1: Pre-processing – Mesh Generation

23.01.2014A Simple Example 36

Part 2: Initial and Boundary Conditions

23.01.2014A Simple Example 37

Dimensional Units

23.01.2014A Simple Example 38

Part 2: Initial and Boundary Conditions

23.01.2014A Simple Example 39

Part 2: Initial and Boundary Conditions

23.01.2014A Simple Example 40

Part 3: Physical Properties

23.01.2014A Simple Example 41

Part 4: Solver Controls

23.01.2014A Simple Example 42

Part 4: Solver Controls

23.01.2014A Simple Example 43

Part 4: Solver Controls - fvSchemes

23.01.2014A Simple Example 44

Numerical schemes

23.01.2014A Simple Example 45

Interpolation schemes

23.01.2014A Simple Example 46

Surface normal gradient schemes

23.01.2014A Simple Example 47

Gradient schemes

23.01.2014A Simple Example 48

Divergence schemes

23.01.2014A Simple Example 49

Laplacian schemes

23.01.2014A Simple Example 50

Time schemes

23.01.2014A Simple Example 51

Part 4: Solver Controls - fvSolution

23.01.2014A Simple Example 52

Linear solver control

23.01.2014A Simple Example 53

Preconditioned conjugate gradient solvers

23.01.2014A Simple Example 54

Smooth solvers

23.01.2014A Simple Example 55

Smooth solvers

23.01.2014A Simple Example 56

Part 5: Processing

23.01.2014A Simple Example 57

Part 5: Post Processing

23.01.2014A Simple Example 58

References

23.01.2014References 59

• OpenFOAM® Documentation, http://www.openfoam.org/docs/

• Nilsson, H. (2009), http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2009

PhD course in CFD with OpenSource software.

• David A. Boger (2011), Getting Started with OpenFOAM ®,

6th OpenFOAM Workshop

• User Forum (http://www.cfd-online.com/Forum/)

• Wiki (http://openfoamwiki.net)

Q & A