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August 2013 – Juli 2017
11 MSEK
Dipl.-Ing. Sabine Bonitz
Improved Prediction of Flow Separation for Road
Vehicles
Motivation
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 2
Flow Separation
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 3
Flow Separation
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 4
Goal
• Better understanding of the physics• Development of experimental methods to indentify and
investigate separation zones• Improved numerical calculations due to an improved
procedure
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 5
Project status
• An improved knowledge of the physics is necessary• What are driving forces which lead to separation• How can sources of separation be located
Investigation of the flow field and its development close to the surface by means of particle traces/ streamlines
Analysis of the pressure distribution Experimental investigations in the Volvo Cars wind tunnel Numerical simulations
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 6
Analysis
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 7
CFD Experiment
Analysis
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 8
Analysis
Streamlines 50 mm above the surface Streamlines on the surface
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 9
Future work
• Experimental investigations in the wind tunnel• Surface pressure distribution• Flow visualizations• Flow field investigations
• Numerical simulations• Test of the influence of the turbulence model• Steady and unsteady simulations• Mesh quality studies
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 10
Thank you for the attention
Dipl.-Ing. Sabine Bonitz Fordonskonferens 2014 - Göteborg 11