A two-dimensional analytical model of vertical water entry for asymmetric bodies with flow separation

Autor: Alan Tassin, Romain Hascoët, Nicolas Jacques, Yves-Marie Scolan
Přispěvatelé: Institut de Recherche Dupuy de Lôme (IRDL), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Brest (UBO)-Université de Bretagne Sud (UBS), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
[PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
Computation theory
Modified Logvinovich Model
FOS: Physical sciences
020101 civil engineering
Ocean Engineering
02 engineering and technology
Computational fluid dynamics
Wetted area
01 natural sciences
010305 fluids & plasmas
0201 civil engineering
Wagner's theory
Flow separation
0103 physical sciences
water entry
14. Life underwater
[PHYS]Physics [physics]
Water entry
Non-linear model
[PHYS.PHYS]Physics [physics]/Physics [physics]
business.industry
Cavity flow
Drop (liquid)
Cavity flowInclined flat plates
Fluid Dynamics (physics.flu-dyn)
Physics - Fluid Dynamics
Mechanics
Slamming
Intermediate phase
NACA foil
Two-dimensional body
cavity flow
Wagner's model
Physics - Atmospheric and Oceanic Physics
flow separation
Nonlinear model
Atmospheric and Oceanic Physics (physics.ao-ph)
Modified Logvinovich model
business
Reliable estimates
Geology
Zdroj: Applied Ocean Research (0141-1187) (Elsevier BV), 2019-11, Vol. 92, P. 101878 (13p.)
Applied Ocean Research
Applied Ocean Research, Elsevier, 2019, 92, pp.101878. ⟨10.1016/j.apor.2019.101878⟩
ISSN: 0141-1187
DOI: 10.1016/j.apor.2019.101878⟩
Popis: The vertical water entry of asymmetric two-dimensional bodies with flow separation is considered. As long as there is no flow separation, linearised Wagner's theory combined with the Modified Logvinovich Model has been shown to provide computationally fast and reliable estimates of slamming loads during water entry. Tassin et al. (2014) introduced the Fictitious Body Continuation (FBC) concept as a way to extend the use of Wagner's model to separated flow configurations, but they only considered symmetric bodies. In the present study, we investigate the ability of the FBC concept to provide accurate estimates of slamming loads for asymmetric bodies. In this case, flow separation may not occur simultaneously on both sides of the body. During an intermediate phase, slamming loads are governed by a competition between the local drop in pressure due to partial flow separation and the ongoing expansion of the wetted area. As a first benchmark for the model, we consider the water entry of an inclined flat plate and compare the FBC estimates with the results of a nonlinear model. Then, we consider the case of a foil and compare the FBC results with Computational Fluid Dynamics predictions. In both cases, we find that the FBC model is able to provide reliable estimates of the slamming loads.
28 pages, 11 figures, 1 table, accepted for publication in Applied Ocean Research
Databáze: OpenAIRE
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