Morison's Equation Drag Lift And Inertia Coefficient

Calculate drag coefficient, lift coefficient and inertia coefficient for Morison's equation.

Drag, lift, and inertia coefficients are affected by proximity to the seabed or another structure. In open water the lateral coefficient tends to zero. The Keulegan Carpenter number is a measure of the ratio of inertial forces and drag forces.

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CALCULATOR : Morison's Equation Horizontal Cylinder Drag Lift And Inertia Coefficients (DNV 1981) [FREE] ±

Calculate Morison's equation drag, lift and inertia coefficients for horizontal pipelines or circular tubulars.

The drag, lift and inertia coefficients are calculated from the Keulegan Carpenter number and the gap over diameter ratio from figures in Appendix A DNV 1981.

Reference : DNV Rules For Submarine Pipeine Systems, 1981

Tool Input

zptype : Elevation Type
- G : User Defined Gap Under Pipeline
Vhu : Wave Horizontal Velocity
Tu : Wave Peak Period
D : Outer Diameter Including Coatings

Tool Output

Cd : Drag Coefficient
Cl : Lift Coefficient
Cm : Inertia Coefficient
G/D : Gap Over Diameter Ratio
Kc : Keulegan Carpenter Number
Ztop : Top Of Pipe Elevation Above Seabed

CALCULATOR : Morison's Equation Horizontal Cylinder Drag Lift And Inertia Coefficient Check Values (DNV 1981) [FREE] ±

Calculate Morison's equation check values for drag, lift and inertia coefficients for horizontal pipelines or circular tubulars.

Use the Result Plot option to display a plot of the selected check value. The drag, lift and inertia coefficients are calculated from the Keulegan Carpenter number and the gap over diameter ratio using figures from DNV 1981 Appendix A.

Reference : DNV Rules For Submarine Pipeine Systems, 1981

Tool Input

facttype : Coefficient Type
G/D : Gap Height To Diameter Ratio
Kc : Keulegan Carpenter Number

Tool Output

Z : Coefficient Value

CALCULATOR : Morison's Equation Keulegan Carpenter Number Airy Stokes And Cnoidal Wave [FREE] ±

Calculate Morison's equation Keulegan Carpenter number and Reynolds number for vertical or horizontal tubulars (Airy Stokes and Cnoidal waves).

The Keulegan Carpenter number and Reynolds number are calculated from the wave horizontal velocity at zero degrees phase angle. For vertical tubulars the wave reduction should be set to 1 (no wave spreading). Wave spreading accounts for multi directional waves.

Tool Input

wavetype : Wave Type
lttype : Wave Parameter Type
- Tu : User Defined Wave Period
- Lu : User Defined Wave Length
ztype : Height Above Seabed Type
- zhu : User Defined Height
d : Water Depth
H : Wave Height
OOD : Pipeline Outer Diameter

Tool Output

Kc : Keulegan Carpenter Number
L : Wave Length
T : Wave Period
c : Wave Celerity
cvg : Convergence Check
w : Wave Trough Height Above Seabed