WAVE AND CURRENT LOADS

PSE PETROLEUM STRUCTURAL ENGINEERING® SOFTWARE

WAVE AND CURRENT LOADS

Wave and current loads generated forces applied to submerged structural members in platforms and floating hulls are analyzed through linear and nonlinear kinematics in accordance with the API RP 2A specifications.

The PSE software computes wave and current forces applied on the structural members. The wave kinematics can be established using either Airy’s linear theory or Fenton’s nonlinear theory.

NONLINEAR KINEMATIC THEORY

The linear kinematic theory is valid where the wave height is small compared to the water depth. On the other hand, the nonlinear kinematic theory, proposed by J.D. Fenton, solves the motion equations by representing the velocity potential and surface elevation with a Fourier series. The later method minimizes the error of each parameter governing the wave motion equations and is valid over the entire spectrum.

WAVE PROFILE

The PSE software accounts for the following wave profiles and kinematic parameters:
– Wave period
– Incidence angle
– Elevation of the sea bed
– Elevation of the still water line (SWL)
– Kinematic reduction factor
– Crest position criterion
A preview of the wave surface profiles, velocities and accelerations at any point is readily available.

CURRENT PROFILE

With the PSE Petroleum Structural Engineering® software, the current profile is described with respect to the sea bed. The current speed is defined by a set of elevation-velocity-angle triplets and the reduction of the current speed in the vicinity of the structure or the blockage factor is accounted for.
In order to combine the current with the wave profile, the current needs to be stretched, or compressed, to the local wave surface. Two stretching methods are available:
– The linear stretching method, also known as the Wheeler stretching
– The nonlinear method or hyperbolic stretching

DOPPLER EFFECT

According to commentary C.3.2.1 of the design code API RP-2A- 2003, the Doppler effect is accounted for by calculating an apparent period defined as the wave period as seen by an observer moving with the current.

MEMBER WAVE LOADS

The input for the member wave loads consists of the following six parameters:
– Current profile
– Wave profile
– Marine growth profile
– Drag coefficient
– Inertia coefficient
– Shielding factor

EFFECT OF MARINE GROWTH ON MEMBERS

Marine growth increases the cross section diameter and surface roughness of the members, and it is defined by a set of elevation-thickness pairs.

MEMBER FORCES

The member forces, calculated using Morison equation, vary according to the position of the waves with respect to the structure. In order to obtain the maximum forces in the members, the critical position of the wave crest is determined by the program.

KEY features

The PSE is a structural engineering software solution for the analysis, design and rehabilitation of drilling structures including drilling masts, derricks and substructures.

The advanced structural analysis of the PSE software allows engineers to achieve specialized analyses crucial to offshore and onshore projects related to the oil and gas industry.

Wind loads, based on the velocity component approach, are defined according to API 4F Specification for Drilling and Well Servicing Structures (4th edition).

Vessel dynamic motions are defined according to API 4F Specification for Drilling and Well Servicing Structures (4th edition).

Other environmental forces such as wave and current loads are also considered for the analysis and design of offshore drilling structures.

STRUCTURAL STEEL DESIGN

The PSE software allows to verify, design and optimize steel members of drilling structures according to various international design codes.

Read More

EXTRA features

Advanced Analysis

The advanced structural analysis of the PSE software allows the user to achieve specialized analyses crucial to any projects related to the oil and gas industry.

Community builder

We develop our structural software in a collaborative spirit with our customers to create innovative structural technologies tailored to their needs.

Unit Systems

Metric, imperial and mixed units systems are allowed and can be modified at any time. Reports are printed according to any unit system.

Easy to use Interface

The software is a technology built on a powerful user-friendly interface offering comprehensive analysis options and intuitive modeling features.

Outstanding support

Our technical team consist of experienced structural engineers providing relevant and effective support.

Multilingual & translatable

The PSE software is currently available in both English and French and can be translated to any other languages. This includes all documentation, tutorials and user guides.

CONTACT

  • + 1 800 810 9454 (USA & CAN)
  • + 1 418 654 9454 (INTL)
  • info@safi.com
  • 3393, Sainte-Foy Road
    Quebec City, CANADA
    G1X1S7

get started

  • TUTORIAL VIDEOS
  • TECHNICAL SUPPORT
  • TECHNICAL PAPERS
  • TRAINING
  • NEW FEATURES

PSE Newsletter

2019 © All rights reserved. PETROLEUM STRUCTURAL ENGINEERING IS A REGISTERED TRADEMARK OF SAFI QUALITY SOFTWARE INC.