Hydrodynamic forces on a marine riser: a velocity-potential method

Journal Article · Mon Mar 01 04:00:00 EST 1982 · J. Energy Resour. Technol.; (United States)

DOI:https://doi.org/10.1115/1.3230380· OSTI ID:6022922

Chung, J S

A linear equation is mathematically derived for hydrodynamic forces on a marine riser under effects of free surface and floating-vessel motion using a velocitypotential method. It accounts for inertia and wave damping forces, including the force caused by riser motion, and empirically includes the drag force caused by viscosity. The equation, when reduced to a simpler form, is basically identical to the semi-empirical Morison equation for the inertia and drag forces. Theoretical validity of the simpler equation and the Morison equation is discussed. Previously, practical, semi-empirical force equations on the riser have been suggested, ignoring the effects of the free surface and the wave damping. The equations in current practice are compared with the present simpler equation.

• Research Organization: Colorado School of Mines, Golden, Colorado 80401
• OSTI ID: 6022922
• Journal Information: J. Energy Resour. Technol.; (United States), Journal Name: J. Energy Resour. Technol.; (United States) Vol. 104:1; ISSN JERTD
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
423000* -- Engineering-- Marine Engineering-- (1980-)
CALCULATION METHODS
DAMPING
DIFFERENTIAL EQUATIONS
EQUATIONS
FLUID MECHANICS
HYDRODYNAMICS
LINEAR MOMENTUM
MARINE RISERS
MECHANICS
MOMENT OF INERTIA
MOTION
PARTIAL DIFFERENTIAL EQUATIONS
PIPES
WAVE EQUATIONS
WAVE FORCES