TY - GEN
T1 - Numerical investigation of the spatial development of a wave packet in laminar boundary layers with zero and adverse pressure gradient
AU - Haas, Anthony
AU - Fasel, Hermann F.
PY - 2013
Y1 - 2013
N2 - The effect of an adverse pressure gradient (without separation) on the downstream development of a wave packet in a flat plate boundary layer is investigated using threedimensional Direct Numerical Simulations (DNS) based on the incompressible Navier-Stokes equations. The wave packet was generated by a short duration pulse at the surface of the flat plate. Both the linear and nonlinear stages of the evolution of the wave packet were considered. For investigating the linear stages, the initial disturbance amplitudes were kept very small, whereas for investigating the nonlinear stages, larger amplitudes were used. The DNS results for the linear case are in very good agreement with Linear Stability Theory (LST) calculations. The pressure gradient was found to significantly increase the growth of instability waves compared to the case without pressure gradient. For the high-amplitude case, the strong disturbance growth and the ensuing nonlinear interactions quickly lead to the formation of a turbulent spot.
AB - The effect of an adverse pressure gradient (without separation) on the downstream development of a wave packet in a flat plate boundary layer is investigated using threedimensional Direct Numerical Simulations (DNS) based on the incompressible Navier-Stokes equations. The wave packet was generated by a short duration pulse at the surface of the flat plate. Both the linear and nonlinear stages of the evolution of the wave packet were considered. For investigating the linear stages, the initial disturbance amplitudes were kept very small, whereas for investigating the nonlinear stages, larger amplitudes were used. The DNS results for the linear case are in very good agreement with Linear Stability Theory (LST) calculations. The pressure gradient was found to significantly increase the growth of instability waves compared to the case without pressure gradient. For the high-amplitude case, the strong disturbance growth and the ensuing nonlinear interactions quickly lead to the formation of a turbulent spot.
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M3 - Conference contribution
AN - SCOPUS:84883542198
SN - 9781624102141
T3 - 43rd Fluid Dynamics Conference
BT - 43rd Fluid Dynamics Conference
T2 - 43rd AIAA Fluid Dynamics Conference
Y2 - 24 June 2013 through 27 June 2013
ER -