Abstract
This paper presents an optimization procedure that finds the equilibrium scour depth under a pipeline. Even though much knowledge on scour is available for the most typical marine structures such as a vertical circular monopile of a horizontal pipelines the calculation of the scour depth complex and time-consuming as the transient solution is often modelled as well. In this paper we present a optimization procedure that combined with a computational fluid dynamics, and a model of the bed load finds the equilibrium shape of a scour hole. This can potentially speed up the calculation of the shape of the equilibrium scour hole with a factor of 100. However, it comes with a coast as we will not model the transition and the time scale of the scour hole development.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/LpKq9Twj7zo
Highlights
Scour around and adjacent to marine and coastal structures is an important design issue
In this paper we present a optimization procedure that combined with a computational fluid dynamics, and a model of the bed load finds the equilibrium shape of a scour hole
To fast estimate the shape of a scour hole, scour development was formulated in terms of an optimization problem
Summary
Scour around and adjacent to marine and coastal structures is an important design issue. The use of CFDmodels has shown promising results They can predict transition from for instance a flatbed to a fully developed scour hole with good accuracy. A major drawback of such models is the long computational time needed for modelling the whole transition from flatbed to fully developed scour whole. The main objective is to model the scour depth over long time span as suggested in (Nielsen and Hansen, 2007) In this method, scour and back-filling rates are needed. The remaining part of this paper will described the methodology, which three parts the; the optimization procedure, the CFD-model and the bed-load model This is followed by examples af finding the equilibrium scour depth under a pipe line and under tandem pipeline arrangement.
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