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physics.flu-dyn2024
Modelling visibility and surface deformation in particle-fluid flow fields generated by helicopter rotors
Stephen Langdon, David J. Needham
As a helicopter descends towards a bed of sand, a high velocity particle laden cloud can form around the helicopter body, a phenomenon known as "brownout", and a consequence of whi…
physics.flu-dyn2024
A mathematical model for wind-generated particle-fluid flow fields with an application to the helicopter cloud problem
D. J. Needham, S. Langdon
We develop a model for the interaction of a fluid flowing above an otherwise static particle bed, with generally the particles being entrained or detrained into the fluid from the…