Correlation of timedependent force coefficients for cylinders in oscillatory flow
Abstract
Attention is given to the inertial pressure concept, a semiempirical technique for determining the forces acting on immersed bodies in unsteady flow situations. It is noted that force expressions obtained using this concept contain empirically determined timevarying coefficients that perform roles similar to those of the constant mass and drag coefficients associated with Morison's (1950) equation. The feasibility of correlating these timevarying coefficients and employing the results to determine the inline forces on circular cylinders in onedimensional oscillatory flows is investigated. The possibility for correlation is deonstrated both qualitatively and quantitatively. In addition, a simple representation of the timedependent coefficients, referred to as the 'universal' curve, is presented. It is shown that forces predicted using the 'universal' curve are more consistent with measured data than the forces predicted by Morison's equation in the draginertia regime.
 Publication:

AIAA, Aerospace Sciences Meeting
 Pub Date:
 January 1984
 Bibcode:
 1984aiaa.meetS....R
 Keywords:

 Circular Cylinders;
 Computational Fluid Dynamics;
 Correlation Coefficients;
 Force Distribution;
 Oscillating Flow;
 Submerged Bodies;
 Time Dependence;
 Marine Environments;
 One Dimensional Flow;
 Water Waves;
 Fluid Mechanics and Heat Transfer