hal-02354275
https://ensta-bretagne.hal.science/hal-02354275
doi:10.1016/j.apor.2019.101878
[UNIV-BREST] Université de Bretagne occidentale - Brest (UBO)
[ENSTA-BRETAGNE] ENSTA Bretagne
[CNRS] CNRS - Centre national de la recherche scientifique
[UNIV-UBS] Université de Bretagne Sud
[IFREMER] IFREMER : Institut français de recherche pour l'exploitation de la mer
[UBS] Université de Bretagne Sud
[ENIB] Ecole Nationale d'Ingénieurs de Brest
[IRDL] Institut de Recherche Dupuy de Lôme - CNRS FRE 3744
[ENSTA-BRETAGNE-MECA] Département Mécanique
[TEST-HALCNRS] Collection test HAL CNRS
[ENSTA-BRETAGNE-PTR3-IRDL] ENSTA-BRETAGNE-PTR3-IRDL
A two-dimensional analytical model of vertical water entry for asymmetric bodies with flow separation
Hascoët, Romain
Jacques, Nicolas
Scolan, Yves-Marie
Tassin, Alan
[PHYS] Physics [physics]
[PHYS.PHYS.PHYS-FLU-DYN] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn]
ART
Computation theory
Computational fluid dynamics
Cavity flowInclined flat plates
Intermediate phase
Non-linear model
Reliable estimates
Two-dimensional body
Wagner's theory
Water entry
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. [11] 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.v
2019-11
en
Applied Ocean Research
Elsevier