Impulsive Hydrodynamics of Submerged Rigid Bodies

by C. J. Garrison, Asst. Prof. of Mech. Engrg.; Naval Postgraduate School, Monterey, CA,
Ronald B. Berklite, Lt. Cmdr., U.S. Navy, Grad. Student; Dept. of Mech. Engrg., Naval Postgraduate School, Monterey, CA,

Serial Information: Journal of the Engineering Mechanics Division, 1973, Vol. 99, Issue 1, Pg. 99-120

Document Type: Journal Paper


A theoretical approach to the calculation of hydrodynamic loads is outlined herein and numerical results are presented for several submerged configurations. Computations were carried out for a number of configurations including a vertical cone, sphere, and vertical circular cylinder and various comparisons with classical results are made. Numerical results for these submerged structures are presented in the form of a dimensionless hydrodynamic load parameter or added mass coefficient. Results corresponding to a number of different water depths are presented to show the rather sizable effect of the relative water depth on the hydrodynamic force. It is shown that for typical earthquake frequencies, the effect of the free water surface is to reduce the hydrodynamic loads in comparison to the corresponding infinite depth values. Experimental results obtained by vibration testing show excellent agreement with the theoretical results.

Subject Headings: Hydrodynamics | Rigid body dynamics | Load factors | Numerical methods | Submerging | Comparative studies | Water management | Computing in civil engineering

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