August 2013 – Juli 2017

11 MSEK

Dipl.-Ing. Sabine Bonitz

Improved Prediction of Flow Separation for Road

Vehicles

Motivation

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Flow Separation

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Flow Separation

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Goal

• Better understanding of the physics• Development of experimental methods to indentify and

investigate separation zones• Improved numerical calculations due to an improved

procedure

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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

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Analysis

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CFD Experiment

Analysis

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Analysis

Streamlines 50 mm above the surface Streamlines on the surface

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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

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Thank you for the attention

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