University Of Tasmania
2015 CAV - Pearce_Brandner_Foster.pdf (1.21 MB)

Ventilated cavity flow over a backward-facing step

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conference contribution
posted on 2023-05-23, 10:50 authored by Bryce PearceBryce Pearce, Paul BrandnerPaul Brandner, Foster, SJ
Ventilated cavities detaching from a backward facing step (BFS) are investigated for a range of upstream boundary layer thicknesses in a cavitation tunnel. The upstream turbulent boundary layer thickness is varied by artificial thickening of the test section natural boundary layer using an array of transversely injected jets. Momentum thickness Reynolds numbers from 6.6 to 44 × 103 were tested giving boundary layer thickness to step height ratios from 1.25 to 3.8. A range of cavity lengths were obtained by variation of the ventilation flow rate for several freestream Reynolds numbers. Cavity length to step height ratios from 20 to 80 were achieved. Cavity length was found to be linearly dependent on ventilation rate and to decrease with increasing boundary layer thickness and/or Reynolds number. This result may have implications in the practical optimization of these flows which occur in applications such as drag reduction on marine hull forms.


Publication title

Journal of Physics Conference Series: 9th International Symposium on Cavitation








Australian Maritime College


Institute of Physics Publishing Ltd

Place of publication

United Kingdom

Event title

9th International Symposium on Cavitation

Event Venue

Lausanne, Switzerland

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Creative Commons Attribution 3.0 licence

Repository Status

  • Open

Socio-economic Objectives

Nautical equipment