Prediction of falling cylinder through air-water-sediment columns
Loading...
Authors
Fan, Chenwu
Chu, Peter C.
Subjects
Advisors
Date of Issue
2006-03
Date
2006-03
Publisher
Language
Abstract
A falling rigid body through air, water, and sediment is investigated experimentally and
theoretically. Two experiments were conducted to drop rigid cylinders with density ratio
around 1.8 into shallow water (around 13 m deep) in the Monterey Bay (Exp-1) and into
the Naval Postgraduate School’s swimming pool (Exp-2). During the experiments, we
carefully observe cylinder track and burial depth while simultaneously taking gravity
cores (in Exp-1). After analyzing the gravity cores, we obtain the bottom sediment density
and shear strength profiles. The theoretical work includes the development of a 3D rigid
body impact burial prediction model (IMPACT35) that contains three components: triple
coordinate transform and hydrodynamics of a falling rigid object in a single medium (air,
water, or sediment) and in multiple media (air-water and water-sediment interfaces). The
model predicts the rigid body’s trajectory in the water column and burial depth and
orientation in the sediment. The experimental data (burial depth, sediment density, and
shear strength) show the capability of IMPACT35 in predicting the cylinder’s trajectory
and orientation in a water column and burial depth and orientation in sediment.
Type
Article
Description
Journal of Applied Mechanics, American Society of Mechanical Engineers, 73, 300-314.
The article of record as published may be located at http://dx.doi.org/10.1115/1.2125975
The article of record as published may be located at http://dx.doi.org/10.1115/1.2125975
Series/Report No
Department
Oceanography
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Chu, P.C., and C.W. Fan, 2006: Prediction of falling cylinder through air-water-sediment columns (paper download). Journal of Applied Mechanics, American Society of Mechanical Engineers, 73, 300-314.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.