Pipeng Toolbox : Morison Equation Modules Login
Short Cuts
GO
Main ±
Beams ±
References ±
Fluid Flow ±
Fluid Properties ±
Maths ±
Materials ±
Pipelines ±
Soils ±
Subsea ±
Data ±
Units ±
Help ±
Demo

Morison Formula Modules

Links : ±
CALCULATOR MODULE : Morison's Equation Wave And Current Load   ±

Calculate wave and current loads on submerged structures using Morison's equation (Airy Stokes and Cnoidal waves).

For vertical structures the load forces are due to the horizontal velocity and acceleration only. For horizontal structures the load forces also include vertical velocity and acceleration. Lateral (lift) forces are due to non symmetric flow around the structure, either because of proximity to the seabed or another structure, or by non symmetric cross section. The Keulegan Carpenter number is a measure of the ratio of wave inertial forces and drag forces.

Change Module :

CALCULATOR MODULE : Morison's Equation Wave Slam   ±

Calculate wave slamming loads on submerged structures using Morison's equation (Airy Stokes and Cnoidal waves).

Wave slamming loads are due to the impact of the wave surface against the structure. The combined wave loading includes wave drag load, inertia load, and lateral load. For horizontal structures buoyancy load is also included. Wave slamming loads occur on the front of the wave only (phase angle ≤ 180 degrees). Wave loads are calulated at the wave surface (wave surface height is calculated from wave phase angle).

theoretical wave slamming load coefficient varies between π and 2 π. The calculated wave slamming load is force per length (unit force). To calculate the total load (force) on a vertical structure the wave curl coefficient can be used

`Lt = λ Hw Fs `

where :

Lt = the total load (force)
λ = the wave curl coefficient
Hw = the wave height
Fs = the slamming load (force per length)

The wave curl coefficient accounts for the variation in time for the wave to contact the whole vertical structure. Typical values of the wave coefficient λ vary from 0.4 to 0.9.

Change Module :

CALCULATOR MODULE : 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.

Change Module :

CALCULATOR MODULE : Morison's Equation Subsea Pipeline Stability   ±

Calculate stability of on bottom structures using Morison's equation (Airy Stokes and Cnoidal waves).

For horizontal stability the horizontal wave and current loads must be less than the restraining friction force. For vertical stability the specific gravity should be greater than or equal to 1.1. Wave vertical velocity and acceleration are ignored. For some structures, depending on geometry, tipping should also be considered. Tipping does not generally occur on pipelines.

Refer also to : DNV-RP-F109 On-Bottom Stability Design Of Submarine Pipelines.

Change Module :

Related Modules :

CALCULATOR MODULE : Morison's Equation Wave And Current Amplitude   ±

Calculate wave and current amplitude for Morison's equation from return period data.

Wave and current amplitude is calculated from return period data using linear regression with either the Weibull, Gumbel or Frechet probability distributions. Use the Result Plot option to display plots for the selected wave type etc. Details of the linear regression are displayed in the output at the bottom of the page.

Change Module :

Related Modules :

pipeng.com 2025 (610 μs : 6 ms : 0.813 MB) Pengu CMS ©