Validation of OrcaFlex’s handling of wave load RAOs.Ī validation of the way OrcaFlex handles buoyancy forces and pipe internal contents pressure effects, and the Results from the BMT frequency domain program NMIWAVE with OrcaFlex time domain results. Three separate comparisons with standard theoretical results: (1) the catenary equations, extended to allow forĪxial stretch (2) natural frequencies of a beam (3) deflection of a cantilever beam.Ī validation of OrcaFlex’s implementation of frequency dependent added mass and damping for vessels. This paper considers numerical analysis of the large-deflection due to coupled torsion/bending of a weightless The continuous equations rather than the discretised finite element approach of OrcaFlex.Ī comparison with published work by Reismann, in the International Journal of Non-Linear Mechanics. OrcaFlex to a solution of the governing set of continuous equations for a cable with bending stiffnessįor a static case.This comparison is a particularly strong validation of OrcaFlex since the authors use Static and dynamic comparisonsĪ comparison with published results from a paper published at OMAE 2005.
#Orcaflex torsion code#
OrcaFlex to a code written as part of the author’s PhD study. Wave dynamics and irregular wave dynamics.Ī comparison with published results from a paper published at OMAE 2006. We also publish a number of more detailed validation cases: 99/101Ī comparison with Flexcom for a typical deepwater SCR. We recommend that you read this document first. The document also presents some comparisons of OrcaFlex with both real world data and other programs.
#Orcaflex torsion software#
A good curvature distribution correlation is observed for both top connection models (OrcaFlex x Abaqus) in the bend stiffener area with reduced amplitudes when riser bending hysteresis is considered.The principal validation document for OrcaFlex is 99/005 OrcaFlex QA, Testing and Validation which describes the overall software QA process we use for developing OrcaFlex. OrcaFlex curvature distribution results are also compared with a quasi-static finite element model that uses an elasto-plastic formulation with kinematic hardening to represent riser hysteresis through an equivalent beam model. This work investigates a 7” flexible riser-bend stiffener top connection with I-tube interface by performing irregular wave global dynamic analyses with the OrcaFlex package and considering a nonlinear bending moment vs curvature riser behavior obtained from a detailed cross sectional model developed in Abaqus. For a more accurate top connection assessment, the flexible riser bending hysteresis can also be directly incorporated in the global dynamic analysis helping to reduce curvature amplitude and lifetime prediction conservatism. The interface with the I-tube and its curved sleeve combined with the gap between the riser and bend stiffener may lead to different curvature distribution when compared to the traditional modeling approach that considers the bend stiffener attached to the pipe. The flexible riser top connection to the floating production platform is a critical region for fatigue lifetime (re)assessment.
Journal of Verification, Validation and Uncertainty Quantification.Journal of Thermal Science and Engineering Applications.Journal of Offshore Mechanics and Arctic Engineering.Journal of Nuclear Engineering and Radiation Science.Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems.Journal of Nanotechnology in Engineering and Medicine.Journal of Micro and Nano-Manufacturing.Journal of Manufacturing Science and Engineering.
Journal of Autonomous Vehicles and Systems.ASME Letters in Dynamic Systems and Control.ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering.Mechanical Engineering Magazine Select Articles.