Specification of hydrodynamic force coefficients (Input Table)

Table description:

Through input table C-DML the hydrodynamic coefficients CD, CM and CL are specified to be used in the Morison equations:

F = FD + FM

and

F - Z = FL

where all forces are vectors.
 

FD

= CD*½*ρ*D*V2

FM

= CM*¼*π*D2*ρ*A

FL

= CL*½*ρ*D*V2

where:

ρ

= mass density of (sea) water

 

D

= outer diameter of pipe

 

V

= total water velocity perpendicular to pipe axis

 

A

= total water acceleration perpendicular to pipe axis

 

The velocities and accelerations are determined at the mid points of the pipeline elements. The drag force FD has the same direction as velocity V, the same relation holds for inertia force FM and acceleration A.

Lift force FL is always directed in the positive Z-direction (upward) and is applicable only to pipelines at or near the sea bed. In other cases the lift coefficient CL should be specified as zero.

C-DML1


H410152, last changed: 2010-01-20

See also:

Data description/conditions

Table error description

Design Function 4.1