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OpenFOAM® Training - CFD SUPPORT
Training Manual
Manual & OpenFOAM® Tutorials
version November 2018
Contents
List of symbols
Latin symbols
Greek symbols
Superscripts
Subscripts
User Training
OpenFOAM Training Introduction
Few notes on this training
What is OpenFOAM?
The open code
What we can find in each OpenFOAM distribution?
OpenFOAM Documentation
General CFD Workflow
OpenFOAM Workflow Software
OpenFOAM in Linux and in Windows
Supported package for Windows:
Supported package for Linux:
OpenFOAM Structure
Before start working, source OpenFOAM software version
OpenFOAM Installation Directory
OpenFOAM applications Directory
Solvers
Utilities
OpenFOAM Libraries (src Directory)
OpenFOAM tutorials Directory
OpenFOAM bin Directory
OpenFOAM etc Directory
OpenFOAM wmake Directory
OpenFOAM Executables (Binaries)
OpenFOAM User Directory
System Variables and Aliases
Meshes in OpenFOAM
Mesh location
Test case: Cavity
Physics
Copying Tutorial
Working with the test case
Working with files
Notes on editing files in Linux
Using
blockMesh
generator
File
blockMeshDict
Running
blockMesh
Test case setup
Boundary and initial condition
Physical properties setup
Reynolds number
Computation setup
Numerical solution setup
Running test case
Simulation Solver
Running the Simulation
Iteration output
Postprocessing
Data conversion
paraFoam
Modifications for practice
Finer mesh
When the options are unknown ...
Test case: Backward-Facing-Step
Test case introduction
Test case set-up
Creating computational mesh using
blockMesh
File
blockMeshDict
Running
blockMesh
Viewing the mesh
Computation set-up
Initial and boundary conditions for
and
Turbulent quantities
Initial and boundary conditions for turbulent quantities
Physical model set-up
Computation set up
Numerical solution parameters
Running test case
Postprocessing
Data conversion
paraFoam
Evaluating pressure coefficient
at the top wall of the channel
Evaluating mass flow at the domain boundaries
Monitoring the convergence
Running in parallel
Parallel decomposition
Parallel run
Parallel reconstruction of solution
Boundary conditions in OpenFOAM
Boundary types
Boundary conditions
Inlet Boundary Conditions
Fixed Value Velocity Family of Inlet Boundary Conditions
Total Pressure Family of Inlet Boundary Conditions
Flow Rate Family of Inlet Boundary Conditions
Inlet Boundary Conditions for Turbulent Kinetic Energy -
Boundary Conditions for Specific Dissipation Rate of TKE -
Inlet Boundary Conditions for Dissipation Rate of TKE -
Outlet Boundary Conditions
Fixed Static Pressure Family of Outlet Boundary Conditions
Zero Gradient Family of Outlet Boundary Conditions
Periodic (Cyclic) Family of Boundary Conditions
Slip vs noSlip BC
Test case: motorBike
Test case description
Mesh generation
Generally about meshes for turbulent RANS flows
Analysis for cell restriction at the wall
snappyHexMesh
OBJ model preparation
Meshing
Run snappyHexMesh
Relaxation of the computation
Test case set-up
Gnuplot - convergence monitoring
Convergence monitoring using
foamLog
Instant convergence monitoring during computation
Instant convergence monitoring during computation
Aerodynamic coefficients
and
Function
probe
Rotation using
OpenFOAM
Test case: mixerVessel
Test case description
Test case set-up
Test case: Multiphase Mixer
Preprocessing
Partial meshes
The wholeMesh
Initial and boundary conditions
Multiple Reference Frame - MRF
Solid Body Motion
Dynamic Meshes in OpenFOAM
Solid body motion
Test case:
sloshingTank2D
Internal motion
Test case:
wingMotion
Dynamic mesh refinement
Test case:
damBreakWithObstacle
Combination of dynamic and static mesh
Test case:
Propeller
Adjoint Shape Optimization
Introduction
Adjoint pitzDaily Tutorial
Adjoint pitzDaily Tutorial Comments
Adjoint pitzDaily Tutorial Evaluation
Duct Tutorial
Duct Tutorial Settings
Duct Tutorial Comments
Duct Tutorial Run
Duct Tutorial Evaluation
Manifold Tutorial
Manifold Tutorial Settings
Manifold Tutorial Run
Manifold Tutorial Evaluation
Homework
Velocity Sensitivity
Adjoint Method Coefficients Sensitivity
Split into Individual Regions
Advanced Training
OpenFOAM Solvers
An overview of OpenFOAM solvers
Algorithms PISO and SIMPLE
PISO
SIMPLE
simpleFOAM Solver General Properties
Incompressible Gas Flow
Unstructured Grid
Finite Volume Method
Three Dimensional
Steady-State
Segregated Solver
Cell Centered Approach
Under-Relaxation
System of Linear Equations
SIMPLE Algorithm
Spatial Integration Numerical Scheme
Temporal Integration Numerical Scheme
Non-Orthogonal Correctors
Turbulent Flow
MRF
Message Passing Interface (MPI)
Creating new OpenFOAM solver
Physical model description
New solver
Implementation
Test case set up
Running test case using new solver
Creating new boundary condition in OpenFOAM
New boundary condition definition
codedFixedValue
uniformFixedValue
Test case: longMixerVessel
Basic test case
Geometry description
Test case set up
Phase ratio initialization
Test case modification
Computational mesh modification
Initial and boundary conditions
Phase ratio initialization
Physical set up
Gravity
Rotation
Running the case
Mesh refinement using
refineMesh
utility
Watching phase volumes in the domain
Watching phase volumes in the domain
Test case: multiRegionHeater
Test case geometry description
Script
Allrun
Test case: roomWithRadiator
Test case geometry description
Test case geometry dimensions
Mesh generation
Test case setup parameters
Radiation setup
Radiation boundary conditions
Radiation properties
Scripts
Running test case
Test case: External Aerodynamics of a Car
Test case description
Parabolic velocity profile in boundary layer
The Flow around the Car without an Engine Compartment
Computational grid preparation
Running the simulation
The Flow around a Car with an Engine Compartment
Mesh generation
Heat exchanger as a porous zone
Defining porosity using
Darcy law
Defining porosity using
Power law
Running the simulation and evaluation of results
Flow around the car on a fine mesh
snappyHexMesh setup
Results visualization
Test case: Wind Turbine
Mesh generation
Mesh of rotating part
Mesh of non-rotating part
Merging meshes of rotating and non-rotating parts together
Simulation and Evaluation set up
Dynamic Mesh
Evaluation of the torque
Running the simulation
Deleting of unnecessary fields during the simulation
Plotting the torque
C++ basics
Preprocessor
Classes
Inheritance
Multiple files
Templates
Templates and inheritance
Thermodynamic library in OpenFOAM - its desing and implementation
OpenFOAM Source-Code C++ Documentation
Generating OpenFOAM Source-Code C++ Documentation
Structure and compilation
Settings and compilation
Specie
Equation of state
Thermodynamical model
Type of energy
Thermo
Transport model
Mixture type
Thermophysical model
Appendix: Fluid Mechanics
Fluid dynamics constitutive relations
Shear stress
Viscosity
Balance equations in fluid dynamics
Continuity equation
Momentum equation
Energy equation
Equation of state
System of Navier-Stokes equations
System of Navier-Stokes equations in vector form
System of governing equations in dimensionless form
Modelling Navier-Stokes equations in laminar regimes
Turbulence Training
Turbulence Training Introduction
Few Notes on This Training
Important Resources
Google and YouTube
Turbulence Modeling Introduction
What is Turbulence?
Reynolds number
Laminar vs. Turbulent Flow
Turbulence Fluctuations
Mean Velocity Profile
Developed Boundary Layer
Boundary Layer Thickness
Momentum Thickness
Reynolds number
Reynolds number
Turbulent Boundary Layer
Friction Coefficient
Pressure Coefficient
How to model turbulence?
Turbulence Modeling Scheme
RANS - Reynolds Averaged Navier-Stokes Equations
DNS - Direct Numerical Simulation
LES - Large Eddy Simulation
DES - Detached Eddy Simulation
Big Decisions to Make
Transient or Steady-state?
If RANS, wall functions? Or resolved to the wall (low-Reynolds models)?
If RANS, Reynolds Stress Models (RSM)?
If RANS, Fully Turbulent? Or the Transition?
Notes on Turbulence Modeling
Turbulence Modeling in OpenFOAM
Turbulence Directory Structure
RANS Models
Description of
turbulence model
View of the source code of turbulence model
Example of creating new turbulence model
Turbulence model modification
Testing new turbulence model
Flat Plate Test Case
Case Description
Run the Flat Plate Case & Play Around
Configuration Script Allrun.sh
Notes on Convergence
Flat Plate Simulation Results Description
Friction Coefficient vs. Reynolds-X
Friction Coefficient vs. Reynolds-Theta
Turbulent Boundary Layer
RANS,
model, lowRe (reolved to the wall)
RANS,
model, wall functions
NACA4412 Test Case
Case Description
Run the NACA4412 Case & Play Around
Configuration Script Allrun.sh
Notes on Convergence
NACA4412 Simulation Results Description
Pressure Coefficient
around the Airfoil Profile
RANS,
turbulence model, lowRe
RANS,
, lowRe, Grid Convergence
RANS vs. URANS vs. DES vs. LES
Appendix: RANS Theory
Reynolds decomposition (averaging) with respect to time
The closure problem
Algebraic turbulence models
Prandtl's mixing length hypothesis
Baldwin - Lomax algebraic model
System of governing equations including Baldwin-Lomax model
Performance, applicability and limitations of the Baldwin-Lomax model
Spalart - Allmaras model
Finite volume method applied on Spalart-Allmaras model
System of governing equations including Spalart-Allmaras model
Model's initial and boundary conditions
Performance, applicability and limitations of the Spalart-Allmaras model
Preprocessing Training
Preprocessing Training Introduction
Preface
Few Notes on This Training
SALOME
OpenFOAM
Other CFD Friendly Software
Cyclone Separator Preprocessing
Objectives of this Tutorial
Cyclone Geometry
SALOME example - Cyclone Preprocessing
Computational Mesh in SALOME
Surface Mesh
Cyclone Separator OpenFOAM Tutorial
OpenFOAM tutorial - Cyclone case - Euler-Euler approach
Physical setup
Case structure
Running the case with SALOME mesh
SnappyHexMesh and running the case
Basic postprocessing
OpenFOAM tutorial - Cyclone case - Euler-Lagrange approach
Physical setup
Case structure
Running the case
Basic postprocessing
Water Valve Preprocessing
Objectives of This Tutorial
Water Valve Tutorial Resources
The Perfect Surface Model for CFD
Typical Workflow of CFD Preprocessing
SALOME example - Water Valve Preprocessing
Load & Explode & Clean the Valve Body
Explode & Clean the Valve Plug
Create the inlet and the outlet
Move the Valve Plug and Create Model Groups
Model Meshing and Export
Water Valve OpenFOAM Tutorial
Water Valve Case
Tutorial Folder
Running the case and results
Usage of your SALOME STL files
Bibliography
Index
About this document ...
OpenFOAM Training by CFD Support, CFD SUPPORT, info@cfdsupport.com +420 212 243 883 © CFD support, s.r.o., Sokolovská 270/201, 190 00 Praha 9, Czech Republic
