Experimental investigation of hydrodynamic loads and pressure distribution during a pyramid water entry

In the maritime environment slamming is a phenomenon known as short duration impact of water on a floating or sailing structure. Slamming loads are local and could induce very high local stresses. This paper reports a series of impact test results and investigate the slamming loads and pressures act...

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Bibliographic Details
Published in:Journal of fluids and structures 2015-04, Vol.54, p.925-935
Main Authors: El Malki Alaoui, A., Nême, A., Scolan, Y.M.
Format: Article
Language:English
Subjects:
Acceleration
Constant impact velocity
Constants
Engineering Sciences
Fluid dynamics
Fluid flow
Impact tests
Impact velocity
Pressure coefficient
Pressure distribution
Pyramid slamming tests
Pyramids
Slamming
Slamming load
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Summary:In the maritime environment slamming is a phenomenon known as short duration impact of water on a floating or sailing structure. Slamming loads are local and could induce very high local stresses. This paper reports a series of impact test results and investigate the slamming loads and pressures acting on a square based pyramid. In this study the slamming tests have been conducted at constant velocity impact with a hydraulic high speed shock machine. This specific experimental equipment avoids the deceleration of the structure observed usually during water entry with drop tests. Three velocities of the rigid pyramid have been used (10, 13 and 15ms−1). Time-histories of local pressures, accelerations and slamming loads were successfully measured. The relationship between the pressure magnitude and the impact velocity is obtained and the spatial distribution of pressures on pyramid sides is characterized. The impact velocity was found to have a negligible influence in predicting the maximum pressure coefficient.
ISSN:0889-9746
1095-8622
DOI:10.1016/j.jfluidstructs.2015.01.018