Long Term Analysis of TLP Extreme Tendon Tensions Using a Coupled Model and Comparison With the Contour Line Approach

2017 ◽  
Author(s):  
Isabel Jimenez Puente ◽  
Gunnar Lian
Keyword(s):  
Coupled Model ◽  
Element Model ◽  
Contour Line ◽  
Probability Of Exceedance ◽  
Tension Response ◽  
Annual Probability ◽  
Short And Long Term ◽  
The Time Domain ◽  
Term Analysis

This paper presents a full long term analysis of a TLP extreme tendon tensions using the all seas approach, and its comparison to the results estimated by the contour line approach. The analysis of the TLP tendon tension response is performed in the time domain using a coupled model where the floater is modelled in the software SIMO, while the tendon system is represented by a Finite Element Model in RIFLEX, including therefore the effects of non-linear restoring from the tendon system and bending and deformations of the tendons. The characteristic tendon tensions with q-annual probability of exceedance are estimated from a full long term analysis where both the short and long term variability are considered. These results are then compared to those obtained through the long term estimate from the contour line approach when assuming the 90th percentile for the worst sea state with q-annual probability of exceedance. The results from the full long term analysis will allow us to verify the adequate percentile level to be used with a contour line approach when estimating extreme TLP tendon tensions.

Long-Term Analysis of Extreme Global Restoring Loads on a FPSO Turret Structure Using a Coupled Model

2018 ◽  
Author(s):  
Isabel Jimenez Puente ◽  
Kjell Larsen
Keyword(s):  
Coupled Model ◽  
Element Model ◽  
Contour Line ◽  
Structural Element ◽  
Mooring Lines ◽  
Probability Of Exceedance ◽  
Extreme Loads ◽  
Annual Probability ◽  
Term Analysis

A turret structure can be a major design driver for FPSO systems. Therefore, careful attention needs to be given to the estimation of extreme loads on this structural element. This paper presents an all seas long-term analysis of the extreme global restoring forces acting on a FPSO turret structure, and a comparison with the results obtained through the contour line approach. The analysis is performed in the time domain using a coupled model, where the floater is modelled in the software SIMO, and the risers and mooring lines are represented by a Finite Element Model in RIFLEX. The characteristic responses of the turret structure with q-annual probability of exceedance are estimated from a full long-term analysis where both the short and long-term variability are considered. These results are compared to those obtained through the long-term estimate from the contour line approach when assuming 90th percentile for the worst sea state with q-annual probability of exceedance. The results from the full long-term analysis will allow us to verify the adequate percentile level to be used with a contour line approach when estimating extreme turret structure loads.

scholarly journals A Short-and Long-Term Analysis of the Nexus between Bitcoin, Social Media and Covid-19 Outbreak

Heliyon ◽  
2021 ◽  
pp. e07539
Author(s):  
Azza Bejaoui ◽  
Nidhal Mgadmi ◽  
Wajdi Moussa ◽  
Tarek Sadraoui
Keyword(s):  
Social Media ◽  
Short And Long Term ◽  
Term Analysis

LOCA analysis of BWR-4/Mark-I nuclear power plant with TRACE

Kerntechnik ◽  
2021 ◽  
Vol 86 (2) ◽  
pp. 128-142
Author(s):  
J.-J. Huang ◽  
S.-W. Chen ◽  
J.-R. Wang ◽  
C. Shih ◽  
H.-T. Lin
Keyword(s):  
Nuclear Power ◽  
Coupled Model ◽  
Short Term ◽  
Containment System ◽  
Loss Of Coolant Accident ◽  
Main Steam Line ◽  
Main Steam ◽  
Temperature Responses ◽  
Term Analysis

Abstract This study established an RCS-Containment coupled model that integrates the reactor coolant system (RCS) and the containment system by using the TRACE code. The coupled model was used in both short-term and long-term loss of coolant accident (LOCA) analyses. Besides, the RELAP5/CONTAN model that only contains the containment system was also developed for comparison. For short-term analysis, three kinds of LOCA scenarios were investigated: the recirculation line break (RCLB), the main steam line break (MSLB), and the feedwater line break (FWLB). For long-term analysis, the dry-well and suppression pool temperature responses of the RCLB were studied. The analysis results of RELAP5/CONTAN and TRACE models are benchmarked with those of FSAR and RELAP5/GOTHIC models, and it appears that the results of the above four models are consistent in general trends.

scholarly journals A Portable Chemotaxis Platform for Short and Long Term Analysis

PLoS ONE ◽  
2012 ◽  
Vol 7 (9) ◽  
pp. e44995 ◽  
Author(s):  
Chenjie Xu ◽  
Yuk Kee C. Poh ◽  
Isaac Roes ◽  
Eoin D. O'Cearbhaill ◽  
Mads Emil Matthiesen ◽  
...  
Keyword(s):  
Short And Long Term ◽  
Term Analysis

Wave Sector Dependent Contour Lines

2007 ◽  
Author(s):  
Gro Sagli Baarholm ◽  
Sverre Haver ◽  
Carl M. Larsen
Keyword(s):  
Linear Response ◽  
Contour Line ◽  
Exceedance Probability ◽  
Wave Direction ◽  
Short Term ◽  
Sea State ◽  
Extreme Loads ◽  
Contour Lines ◽  
Term Analysis

This paper is concerned with estimating the response value corresponding to given annual exceedance probability. In principle, this requires that a full long term analysis is executed. For a linear response this can easily be done. For a non-linear response quantity however, where time domain simulations are required in order to obtain the short term stochastic structure a full long term analysis will be time consuming. An approximate method to determine the long-term extremes by considering only a few short term sea states is outlined. All sea states corresponding to a certain probability of occurrence and are given by a contour line of Hs, Tp for each wave direction. The advantage of the method is that a proper estimate of the long term extreme can be obtained by considering the most unfavourable sea state along the contour line. This will make possible practical estimation of the extreme loads the structure is exposed to. The purpose of the present paper is to illustrate how to apply directional contour lines in order to obtain a characteristic design value according to requirements regarding the marginal exceedance probability.

scholarly journals Time‐Varying Emulator for Short and Long‐Term Analysis of Coastal Flood Hazard Potential

2019 ◽  
Vol 124 (12) ◽  
pp. 9209-9234 ◽  
Author(s):  
D. Anderson ◽  
A. Rueda ◽  
L. Cagigal ◽  
J. A. A. Antolinez ◽  
F. J. Mendez ◽  
...  
Keyword(s):  
Flood Hazard ◽  
Time Varying ◽  
Hazard Potential ◽  
Coastal Flood ◽  
Short And Long Term ◽  
Term Analysis ◽  
Flood Hazard Potential
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