1. Motorbike Simulation with OpenFOAM
Hasret Türkeri
9 December 2016

2. OpenFOAM Computer software Solves equation for flows
Momentum
Pressure
Energy …
Developed for Linux
No graphic interface
Run with commands

3. The Concepts CFD : Computational Fluid Dynamics
Initial and boundary conditions
Mesh - Grid
Numerical Methods …

4. Steps in CFD Pre-Processing Processing Post-Processing
Preparation of grid
Setting initial and boundary conditions
Selecting numerical schemes
Processing
Solving the equation using computer software, OpenFOAM
Post-Processing
Plotting and analyzing the results

5. Pre-Processing in OpenFOAM
Case directory
U, p, rho,…
Constant
System
blockMesh
fvSchemes, fvSolutions

6. Pre-Processing in OpenFOAM blockMesh
vertices (
( )
( )
( )
( )
( )
( )
( )
( ) );
blocks
hex ( ) (20 8 8) simpleGrading (1 1 1)

7. Pre-Processing in OpenFOAM Setting the motorbike velocity
0.org/U => fixedValues => initialConditions -> flowVelocity (20 0 0)
Setting the grid size
In system/blockMesh change the values in green box
blocks (
hex ( ) (20 8 8) simpleGrading (1 1 1) );

8. Processing with OpenFOAM
OpenFOAM runs with commands
ln motorbike case directory
./Allrun
wait until it finishes, it may take a couple of ten minutes
Check log.* files in case of any problem

9. Post-Processing with OpenFOAM
run the command in the motorbike directory
paraFoam
Using parafoam draw countor plots, and streamlines to analyze your results
For tutorial about post-processing you can refer to the post- processing section

10. How to Start OpenFOAM on Windows
I strongly recommend to download and install OpenfOAM from the link below
Follow the instruction on the webpage

11. How to Start OpenFOAM on Windows
Open OpenFOAMforWindows 16.10
C:/OpenFOAM/16.10/Faruk-3.0.x/run

12. How to Start OpenFOAM on Windows
Copy motorBike case dir
From
C:\OpenFOAM\16.10\cygwin64\opt\OpenFOAM\OpenFOAM- 3.0.x\tutorials\incompressible\simpleFoam To
C:/OpenFOAM/16.10/Faruk-3.0.x/run

13. How to Start OpenFOAM on Windows
Open 0.org/initialConditions and set the flow velocity
flowVelocity (20 0 0) Important: The dimension here is m/s
Open system/blockMesh change the values in green box
blocks (
hex ( ) (20 8 8) simpleGrading (1 1 1) );
The number of cells in x, y, z, direction respectively

14. How to Start OpenFOAM on Windows
In terminal, change your directory into motorBike
cd motorBike
In terminal, run the commands
./Allclean
./Allrun
Wait until it finishes, it may takes a couple ten minutes
Once it completes, in terminal, run
paraFoam

15. How to Start OpenFOAM on Windows
In terminal, change your directory into motorBike
cd motorBike
In terminal, run the commands
./Allclean
./Allrun
Wait until it finishes, it may takes a couple ten minutes
Once it completes, in terminal, run
paraFoam

16. How to Start OpenFOAM on Windows
Follow the tutorial for paraFoam at the link
Plot contour plots
Stream lines ….