3D motion dynamics of axisymmetric bodies falling through water

被引：9

作者：

Alsos, Hagbart S. ^{[1
]}

Faltinsen, Odd M. ^{[2
]}

机构：

[1] SINTEF Ocean, Otto Nielsens Vei 10, N-7052 Trondheim, Norway

[2] NTNU, Dept Marine Technol, Otto Nielsens Vei 10, N-7052 Trondheim, Norway

来源：

OCEAN ENGINEERING | 2018年 / 169卷

关键词：

Dropped cylinder; Slamming; Slender body; 2D+t theory; Impulsively started flow; 3D motion;

D O I：

10.1016/j.oceaneng.2018.08.033

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

A new simplified method for analysis of 3D motion dynamics of axisymmetric slender bodies falling from air through water is presented. Slender-body theory for potential flow of incompressible water is combined with 2D + t theory to account for viscous cross-flow separation in the submerged phase. The effect of flow separation from the upstream end of a pipe plays an important role. Furthermore, asymmetric vortex shedding triggering important 3D motions is considered. The water impact loads are based on strip theory and empirical slamming coefficients together with added mass and buoyancy loads. The theory is validated by comparing numerical analyses with experimental drop tests of pipes performed by Aanesland (1987). Error analyses of the theoretical method are performed and compared with tests to explore the sensitivity to input variations.

引用

页码：442 / 456

页数：15

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