A Model Test Ice Resistant Study of FPSO And Yoke Mooring System In Ice Influenced Areas of Bohai Bay

2014 ◽  
Author(s):  
Jianmin Li ◽  
Tongkui Li
Keyword(s):  
Model Test ◽  
Bohai Bay ◽  
Mooring System

Guidelines for CFD Simulations of Spar VIM

2013 ◽  
Author(s):  
Charles Lefevre ◽  
Yiannis Constantinides ◽  
Jang Whan Kim ◽  
Mike Henneke ◽  
Robert Gordon ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Test Data ◽  
Model Test ◽  
Model Tests ◽  
Full Scale ◽  
Mooring System ◽  
Time Step ◽  
Cfd Simulations ◽  
Scaled Model ◽  
Sway Motion

Vortex-Induced Motion (VIM), which occurs as a consequence of exposure to strong current such as Loop Current eddies in the Gulf of Mexico, is one of the critical factors in the design of the mooring and riser systems for deepwater offshore structures such as Spars and multi-column Deep Draft Floaters (DDFs). The VIM response can have a significant impact on the fatigue life of mooring and riser components. In particular, Steel Catenary Risers (SCRs) suspended from the floater can be sensitive to VIM-induced fatigue at their mudline touchdown points. Industry currently relies on scaled model testing to determine VIM for design. However, scaled model tests are limited in their ability to represent VIM for the full scale structure since they are generally not able to represent the full scale Reynolds number and also cannot fully represent waves effects, nonlinear mooring system behavior or sheared and unsteady currents. The use of Computational Fluid Dynamics (CFD) to simulate VIM can more realistically represent the full scale Reynolds number, waves effects, mooring system, and ocean currents than scaled physical model tests. This paper describes a set of VIM CFD simulations for a Spar hard tank with appurtenances and their comparison against a high quality scaled model test. The test data showed considerable sensitivity to heading angle relative to the incident flow as well as to reduced velocity. The simulated VIM-induced sway motion was compared against the model test data for different reduced velocities (Vm) and Spar headings. Agreement between CFD and model test VIM-induced sway motion was within 9% over the full range of Vm and headings. Use of the Improved Delayed Detached Eddy Simulation (IDDES, Shur et al 2008) turbulence model gives the best agreement with the model test measurements. Guidelines are provided for meshing and time step/solver setting selection.

A Novel Approach for Modelling a FPSO Riser Turret Mooring (RTM) System for Mooring Design

2014 ◽  
Author(s):  
Fabrizio Pistani ◽  
Daniel Brooker
Keyword(s):  
Detailed Analysis ◽  
Model Test ◽  
Screening Tool ◽  
Numerical Models ◽  
Experimental Tests ◽  
Design Approach ◽  
Mooring System ◽  
Original Solution ◽  
Software Packages ◽  
Novel Approach

The design approach for the analysis of a riser turret mooring system (RTM) connected to a FPSO is presented here. The design was carried out with the use of numerical models developed with Ariane and Orcaflex software packages. Ariane has been used as a screening tool while the model developed with Orcaflex was used for detailed analysis. The succesful validation of the models against existing experimental tests helps to avoid the repetition of a model test campaign for design of new systems. An original solution to overcome the limitations of the mooring software Ariane has been developed and used for mooring analysis. This paper describes the development of the numerical models highlighting the original features, the validation with the model tests and discusses some of the main results.

scholarly journals MODEL TEST AND COUPLED DYNAMIC ANALYSIS OF A DEEPWATER FPSO WITH INTERNAL TURRET MOORING SYSTEM

Brodogradnja ◽  
2017 ◽  
Vol 68 (4) ◽  
pp. 42-55 ◽  
Author(s):  
Hongwei Wang ◽  
Gang Ma ◽  
Liping Sun ◽  
Kaiye Hu
Keyword(s):  
Dynamic Analysis ◽  
Model Test ◽  
Mooring System ◽  
Coupled Dynamic Analysis

Numerical Calculation and Model Test Study on a Quay Mooring Semi-Submersible Drilling Platform

2010 ◽  
Author(s):  
Qi Wang ◽  
Xiaopeng Wu ◽  
Haining Lu ◽  
Gang Chen ◽  
Xiaoyuan Wu
Keyword(s):  
Numerical Simulation ◽  
Numerical Calculation ◽  
Static Analysis ◽  
Model Test ◽  
Environmental Conditions ◽  
Dynamic Effect ◽  
Mooring System ◽  
Mooring Lines ◽  
Nonlinear Characteristics ◽  
Test Study

This paper introduces the study in both numerical calculation and model test of a Semi-submersible drilling platform moored along the quayside of Shanghai Waigaoqiao Shipbuilding Co. Ltd. (SWS). To obtain reliable quay mooring system for a SEMI in the out-fitting condition, complicated factors, such as a barge is applied between the SEMI and the quayside, quayside has practical limited conditions, nonlinear characteristics of mooring lines and fenders, etc., are firstly discussed. Then based on several simplifications, static analysis about different environmental conditions, normal and typhoon, are carried out, in order to design the preliminary layouts. Later on, model test with the scale of 1:50 is conducted in the basin of Shanghai Jiao Tong University (SJTU). Results between numerical simulation and model test are compared and the dynamic effect created by wave is investigated. Several principles for quay mooring layout of semi-submersible drilling platform have been concluded.

Fundamental Analysis for the SWING Motion of Single Moored FPSO in South China Sea

2012 ◽  
Author(s):  
Yu Ma ◽  
Zhiqiang Hu ◽  
Yan Qu
Keyword(s):  
South China Sea ◽  
Model Test ◽  
South China ◽  
Hydrodynamic Model ◽  
Low Frequency ◽  
Full Scale ◽  
Mooring System ◽  
Fundamental Analysis ◽  
China Sea ◽  
Short Period

FPSO moored by STP mooring system plays a dominate role in oil and gas production in South China Sea. To study its hydrodynamic characters, a joint industry project on full scale measurement for Fenjin FPSO, headed by Shanghai Jiao Tong University and sponsored by CNOOC, was initiated in October 2007 and lasted for 25 months. During the project, a special phenomenon, named as SWING, was noticed. When a SWING happened, the FPSO’s heading angle would change greatly within a relatively short period, beyond the normal range of the weather-vane effect. Due to the large low-frequency motion, the tension forces of mooring system would increase greatly. Also, it may lead to positioning failure during the tandem offloading operation. So, the SWING motion is a great threat to the safety of FPSOs. A preliminary prediction for its cause as well as a fundamental analysis of its hydrodynamic mechanism is completed in this paper. According to the statistical results of the SWING based on the Fenjin’s motion data during the full scale measurement as well as the corresponding wind wave and current data in the same period, a plausible prediction for its cause is provided. It is pointed out that the change of direction and velocity of the current within a short time might be the cause of SWING. The research for the mechanism of the SWING is carried out through both the methods of analytical analysis and the model test. A hydrodynamic model is built to simulate the low-frequency motions of FPSO in time domain. And an in-house MATLAB program is written on the basis of the hydrodynamic model, to do the calculation. Analysis results are compared with the full-scale measured data, to prove the cause prediction. Furthermore, on purpose of validating the program, a model test was conducted in Deepwater Offshore Basin in Shanghai Jiao Tong University. Several different current velocities were chosen in the test. The program results show a good agreement with both the data of full scale measurement and the model test results, which indicates that the hydrodynamic model and the code are both credible.

Model Test of a Mooring System for a Pile-Founded Guyed Tower

1989 ◽  
Author(s):  
F. Rajabi ◽  
A. Mangiavacchi
Keyword(s):  
Model Test ◽  
Mooring System

Physical model test validation of dynamic similarity truncation method for an internal turret mooring system

2022 ◽  
Vol 245 ◽  
pp. 110328
Author(s):  
Hongwei Wang ◽  
Zizhao Zhang ◽  
Gang Ma ◽  
Zhuang Kang ◽  
Kaiye Hu
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Test Validation ◽  
Physical Model Test ◽  
Mooring System ◽  
Truncation Method ◽  
Dynamic Similarity
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