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TRAIL part 2: a comprehensive assessment of ice particle fall speed parametrisations

McCorquodale, M. W. and Westbrook, C. D. ORCID: (2021) TRAIL part 2: a comprehensive assessment of ice particle fall speed parametrisations. Quarterly Journal of the Royal Meteorological Society, 147 (734). pp. 605-626. ISSN 1477-870X

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To link to this item DOI: 10.1002/qj.3936


Results are presented from a comprehensive experimental campaign studying the aerodynamics of 3D-printed analogues of ice particles. Measurements of the drag coefficient of the analogues were acquired by using a novel experimental approach to digitally reconstruct the analogues’ trajectory and orientation as they fall through a quiescent viscous liquid, using images acquired by a series of digital cameras. The data are used to evaluate commonly used parametrisations of ice particle fall speeds. We find that the accuracy of each of the parametrisations reduces at Reynolds numbers greater than approximately 100, as a result of effects associated with the onset of unsteady oscillating, fluttering or tumbling motions as the analogues fall. We propose a new fall-speed parametrisation that predicts the measured drag coefficients at high Reynolds number with an accuracy consistent with that of the leading parametrisation at low Reynolds number.

Item Type:Article
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:93950
Publisher:Royal Meteorological Society


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