A technique has been developed to evaluate the dynamic pressures on cylindrical structures due to irregular waves based on McCamy and Fuchs linear diffraction theory and principle of superposition. Experiments have been conducted in Hydraulic Engineering Laboratory, Indian Institute of Technology, Madras to examine the dynamic pressures excited by irregular waves on circular cylinders of large diameter. The pressures around the cylinder at representative locations were measured and compared with calculated pressures. The spectral density functions computed from pressure time series measured in the laboratory agree well with the calculated pressure spectral densities. The agreement is good and encouraging. © 1983.

Harihara Raman

P. Sambhu Venkata Rao

offshore structure

MATHEMATICAL TECHNIQUES - Numerical Methods

CYLINDERS

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Dynamic pressure distribution on large circular cylinders caused by wind generated random waves

Ocean Engineering

The hydrodynamic pressures due to random waves on a large vertical cylinder, resting on a flume bed and piercing above the free surface has been investigated experimentally in constant water depth. The test cylinder was fixed with diaphragm-type pressure transducers at nine different pressure ports with one of them at the still water level (S.W.L.) itself. The cylinder was rotated about its own axis to study the pressure distribution around its circumference. The time histories of the water surface elevation and the corresponding dynamic pressures exerted on the cylinder have been analysed in the frequency domain. The experimental results are compared with the theoretical results based on the linear diffraction theory of MacCamy and Fuchs and the agreement is satisfactory. Finally, the hydrodynamic pressure coefficients obtained from random wave tests are compared with those from regular wave tests. © 1990.

Coastal Engineering

Dynamic pressures on a large vertical cylinder due to random waves

Wave elevation on large cylinders due to irregular waves have been calculated based on the McCamy and Fuchs linear diffraction theory and on the principle of superposition. Experiments have been conducted in the Hydraulic Engineering Laboratory, Indian Institute of Technology, Madras, to examine the wave elevation excited by wind-generated irregular waves on circular cylinders of large diameter. The wave elevation around the cylinders at representative locations were measured and compared with calculated wave elevations. The spectral density functions computed from wave elevation time series measured in the laboratory were compared with calculated time elevation spectral densities on the cylinder. © 1988 by ASME.

Journal	Ocean Engineering
ISSN	00298018
Open Access	No