School of Civil, Environmental and Mining Engineering

Postgraduate research

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Current and completed research by our postgraduate students.

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Hongyi Jiang


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Hongyi Jiang

Thesis

Numerical flow/pipeline/seabed interaction analysis and scour prediction

Summary

Ensuring pipeline on-bottom stability represents a significant design challenge due to the unique features of flow/pipeline/seabed interactions. Current pipeline design methods assess pipeline on-bottom stability without taking into account sediment transport occurring around the pipeline (e.g. DNV-RP-F109). The field and laboratory evidences of pipeline laid on silty and sandy seabeds have demonstrated that local scour would occur well before the design storm conditions are reached, which may cause the self-burial of the pipeline.

The aim of this project is to develop a new pipeline stability analysis method that will take into account of the interactions of flow/pipeline/seabed. Finite volume method (FVM) based flow analysis code and the sediment transport model will be coupled to perform flow/pipeline/seabed interaction analysis and scour prediction. The sediment transport models for different kinds of soils (sand, silt or clay) can be derived from the laboratory tests (e.g., the O-tube tests).

Why my research is important

1. Pipeline on-bottom stability is an essential topic of marine oil exploitation.

2. The ignorance of the effects of the sediment transport processes on pipeline stability leads to increased costs associated with pipeline stabilization.

3. Numerical analysis is a convenient tool to simulate flow/pipeline/seabed interaction, and more data can be obtained compared with lab or in-situ tests, as long as the code is verified with some experimental results.


 

School of Civil, Environmental and Mining Engineering

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Last updated:
Thursday, 19 September, 2013 11:39 AM

http://www.ceme.uwa.edu.au/416645