August 2013 – Juli MSEK Dipl.-Ing. Sabine Bonitz Improved Prediction of Flow Separation for Road Vehicles

Motivation Dipl.-Ing. Sabine Bonitz Fordonskonferens Göteborg 2

Flow Separation Dipl.-Ing. Sabine Bonitz Fordonskonferens Göteborg 3

Flow Separation Dipl.-Ing. Sabine Bonitz Fordonskonferens 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 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 Göteborg 6

Analysis Dipl.-Ing. Sabine Bonitz Fordonskonferens Göteborg 7 CFD Experiment

Analysis Dipl.-Ing. Sabine Bonitz Fordonskonferens Göteborg 8

Analysis Streamlines 50 mm above the surface Streamlines on the surface Dipl.-Ing. Sabine Bonitz Fordonskonferens 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 Göteborg 10

Thank you for the attention Dipl.-Ing. Sabine Bonitz Fordonskonferens Göteborg 11