On the separated flow behind a swept backward-facing step

Fernholz, H. H.; Janke, Gerd; Kalter, M.; Schöber, Martin

doi:10.1007/978-3-663-13986-7_27

Cited by 8 publications

(2 citation statements)

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“…For example, Fernholz et al [8] showed, that the flow behind a skewed backward facing step (cf. figure 7) shows 3 regions that depend on the skewing angle α.…”

Section: The Flow Of Wind Over a Skewed Obstaclementioning

confidence: 99%

“…The flow around a swept backward facing step [8] (v train ≈ 100m/s) relative to the ground, this corresponds to nearly perpendicular wind relatively to the track (80 o to 90 o ) at a wind speed of approximately 30 m/s. We therefore can conclude, that for the real operation of a train, the characteristic velocity corresponds to the train speed and the dominant flow feature is the longitudinal vortex generated on the leeward side of the train.…”

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confidence: 99%

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Wind tunnel investigation of an ICE 3 endcar on three standard ground scenarios

Schöber

Weise

Orellano

et al. 2010

Journal of Wind Engineering and Industrial Aerodynamics

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An ICE 3 model has been investigated in an automotive wind tunnel on three different ground configurations by means of force measurements and tuft flow visualisations. The aerodynamic force and moment coefficients reveal a strong dependency on the ground configuration, with the embankment configuration giving the highest measured coefficients only for yaw angles β < 40• . The coefficients obtained through the Baker hypothesis are found to be larger than those measured directly on the embankment. The poor agreement between the "measured on embankment coefficients" and the "flat ground with Baker transformation coefficients" is attributed to the fundamental mismatch of relative flow velocities between wind, train and ground during the wind tunnel measurements with the train situated on the embankment. The mismatch of flow velocities causes a strong longitudinal vortex on on the leeward side of the embankment which does not exist in reality and significantly alters the overall flow field. It is thus recommended, for the determination of aerodynamic forces acting on a train on an embankment, to measure the aerodynamic coefficients for the flat ground configuration and subsequently apply the Baker hypothesis.

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“…For example, Fernholz et al [8] showed, that the flow behind a skewed backward facing step (cf. figure 7) shows 3 regions that depend on the skewing angle α.…”

Section: The Flow Of Wind Over a Skewed Obstaclementioning

confidence: 99%

mentioning

confidence: 99%