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TY  - THES
AU  - Albers, Marian
TI  - Numerical analysis of active drag reduction for turbulent airfoil flow; 1. Auflage
PB  - RWTH Aachen University
VL  - Dissertation
CY  - München
M1  - RWTH-2021-05816
SN  - 978-3-8439-4806-7
SP  - xvi, 120 Seiten : Illustrationen
PY  - 2021
N1  - Dissertation, RWTH Aachen University, 2021
AB  - Turbulent boundary layers over slender bodies generate a substantial drag force, which can make up a large share of the overall drag of large aircraft in cruise flight or high speed trains. Active drag reduction approaches, which introduce external energy into the system, are capable of considerably reducing the friction forces attributed to turbulent wall-bounded flows. Among the numerous active techniques, spanwise traveling transversal surface waves is a successful approach for canonical flows, e.g., turbulent channel flow. However, several important questions have not been addressed adequately, yet. Due to a large parameter space of the actuation parameters, their impact on drag reduction was not studied extensively, yet. Furthermore, the technique has not been applied to more complex flows like the turbulent flow around an airfoil. Therefore, high-resolution large-eddy simulations are conducted to study active drag reduction of turbulent flat plate boundary layer as well as an airfoil flow, where drag reduction via traveling transversal surface waves is applied. Zero-pressure gradient turbulent boundary layer flow is the basis for a large parametric study of spanwise traveling transversal surface waves, which is presented first. The results show a maximum drag reduction of −31 
LB  - PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
UR  - https://publications.rwth-aachen.de/record/820772
ER  -