TY - JOUR
T1 - Breakdown in a boundary layer exposed to free-stream turbulence
AU - Mans, J.
AU - Kadijk, E.
AU - Lange, de, H.C.
AU - Steenhoven, van, A.A.
PY - 2005
Y1 - 2005
N2 - The natural secondary breakdown modes of a flat plate boundary layer exposed to a free-stream turbulence level of 6.7% are characterised by experimental visualisations. The used experimental set-up is a water channel and no external triggering of the instabilities is used. The visualisations show the presence of two secondary instability modes, a sinuous (antisymmetric) and a varicose (symmetric) mode. The amplitudes of both instabilities increase, according to a non-linear profile, in upstream direction. The amplitudes also experience temporal growth. When a critical amplitude is reached, roll-up structures appear. These structures develop and finally merge, resulting in a turbulent spot. The development of the amplitude is similar in both modes. However, the amplitude of the varicose instability varies between 0.38 and 0.63 [2 p A/ ¿] and the sinuous amplitude between 0.11 and 0.23 [2 p A/ ¿]. The propagation velocities of the sinuous and varicose instabilities are 0.91 [u/u blas] and 0.87 [u/u blas] respectively. This shows that both modes are located in a low speed streak.
AB - The natural secondary breakdown modes of a flat plate boundary layer exposed to a free-stream turbulence level of 6.7% are characterised by experimental visualisations. The used experimental set-up is a water channel and no external triggering of the instabilities is used. The visualisations show the presence of two secondary instability modes, a sinuous (antisymmetric) and a varicose (symmetric) mode. The amplitudes of both instabilities increase, according to a non-linear profile, in upstream direction. The amplitudes also experience temporal growth. When a critical amplitude is reached, roll-up structures appear. These structures develop and finally merge, resulting in a turbulent spot. The development of the amplitude is similar in both modes. However, the amplitude of the varicose instability varies between 0.38 and 0.63 [2 p A/ ¿] and the sinuous amplitude between 0.11 and 0.23 [2 p A/ ¿]. The propagation velocities of the sinuous and varicose instabilities are 0.91 [u/u blas] and 0.87 [u/u blas] respectively. This shows that both modes are located in a low speed streak.
U2 - 10.1007/s00348-005-0040-6
DO - 10.1007/s00348-005-0040-6
M3 - Article
VL - 39
SP - 1071
EP - 1083
JO - Experiments in Fluids
JF - Experiments in Fluids
SN - 0723-4864
IS - 6
ER -