Cable Best Practice
1.For the Standard specification check the calculated bending stiffness. Generally, this is unrealistically high due to the solid cross section assumption. There is often a need to override the calculated value with a smaller stiffness or else to adopt a Direct specification which uses a stranded cross section. When overriding a large bending stiffness you should ensure that the input value is not too small either (typically should be 0.1 to 100 kN.m2). Very small bending stiffness values can cause solution stability issues and lead to convergence difficulties in particular for static analyses.
2.Typical cable hydrodynamic coefficient values are as follows:
a.Normal Drag: 0.7 to 1.0
b.Tangential Drag: 0.0
c.Normal Inertia: 2.0
d.Tangential Added Mass: 0.0
e.Normal Added Mass: Empty (PipeLay defaults it to Normal Inertia – 1)