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Article information
Modelling roughness and receptivity in three-dimensional boundary-layers
| Authors: |
Tempelmann, D.,
Schrader, L.-U.,
Hanifi, A.H.,
Brandt, L.B.,
Henningson, D.S.H.,
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| Type: |
Conference |
| Pubstate: |
Published |
| Journal: |
Proceedings of the 7th TSFP conference |
| Volume: |
|
| Year: |
2011 |
Abstract
The receptivity of a swept-wing boundary layer to lo-
calised surface roughness is studied by means of direct nu-
merical simulations (DNS). The ?ow case considered is meant
to model wind tunnel experiments performed at the Arizona
State University by Saric & coworkers. The receptivity am-
plitude of the cross?ow disturbances predicted by the DNS is
40% of that measured in the experiments. The DNS results
are then used to evaluate the performance of different recep-
tivity models based on either the parabolised stability equa-
tions or the ?nite Reynolds number theory (FRNT). In gen-
eral it is found that receptivity amplitudes are well predicted
for micron sized roughness elements if non-parallel effects are
accounted for.
ever, they did not model receptivity but extracted initial am-
plitudes from experimental data. Nishino & Shariff (2009)
performed a DNS but obtained receptivity amplitudes far be-
low those measured in the experiments and suspected their
roughness model to be inadequate.
The aim of this study is to carefully compare different ap-
proaches of modelling boundary layer receptivity to surface
roughness. We use both direct numerical simulations and
parabolised stability equations (PSE). The latter may be used
in combination with their respective adjoint (APSE) to predict
receptivity. Further, we compare to the FRNT results by Ng
& Crouch (1999).
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