The wave force on a seawater intake well model consisting of a perforated circular caisson (500mm diameter) encircling a vertical suction pipe (50mm dia) is measured experimentally. The effect of porosity of the caisson wall, incident wave height and wave period on the in-line forces on the caisson and suction pipe is investigated. The porosity of the caisson was varied from 4.54% to 19.15%. Waves of wide ranges of heights and periods were used. The wave forces on the outer caisson & inner cylinder, water surface fluctuations in the interior & exterior of the caisson and wave run-up on the outer caisson & inner cylinder are studied. The present paper includes the wave forces on the outer perforated circular caisson and inner circular cylinder due to regular waves only.

Ranganathan Sundaravadivelu

Department of Ocean Engineering

K. Vijayalakshmi

IN-LINE FORCES

SEA WATER INTAKE STRUCTURE

SUCTION PIPE

WATER SURFACE FLUCTUATIONS

Acceleration

Caissons

Cylinders (shapes)

Density of liquids

Drag

KINEMATICS

Mathematical models

Piles

pipe

Porosity

Reynolds number

Viscosity of liquids

WATER WAVE EFFECTS

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IIT Madras

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

The wave force on a seawater intake structure consisting of a perforated square caisson of 400 mmx400 mm size encircling a vertical suction pipe of 160-mm diameter is investigated using physical model studies. The porosity of caisson was varied from 1.6 to 16.9%. Regular and random waves of wide range of heights and periods were used. It is found that the force ratio (ratio of the force on perforated caisson to the force on caisson with zero percent porosity) reduces to an extent of up to 60% with increase in porosity of the caisson from 1.6 to 16.9%. The force ratio was found to increase with increase in relative wave height and reduces with increase in relative width. Multiple regression analysis of the measured data points was carried out and predictive equations for wave force ratios are obtained both for regular and random waves. The results of this investigation can be used in the hydrodynamic design of perforated caissons, which are widely used as seawater intake structures. © 2002 Elsevier Science Ltd. All rights reserved.

Ocean Engineering

Wave forces on a seawater intake caisson

Wave forces on, and water-surface fluctuations around a vertical cylinder encircled by a perforated square caisson

Journal of Applied Mechanics

Mechanics of Wave Forces on Offshore Structures

Offshore Technology Conference

In - Line And Transverse Forces, On Cylinders In Oscillatory Flow At High Reynolds Numbers.

Science Education

Galdone, Paul. The hare and the tortoise. New York (330 West 42nd Street): Whittlesly house books for young people, McGraw-Hill Book Company, 1962. Unpaged. $2.50

Wave loads on a perforated circular caisson and suction pipe of a sea water intake structure

Journal	Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Open Access	No