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Modelling and Analysis of Flow-Induced Vibrations of Steel Catenary Risers Conveying Multiphase Flow

Project Description

Robert Gordon University, through the School of Engineering is offering a PhD studentship with tuition fees funded for Home/EU or International applicants.

This is a fees-only funded PhD studentship provided by the School of Engineering and interested candidates will have to secure their own financial support to upkeep their living costs.

Marine risers are widely used for offshore oil and gas transportation in the deep waters. These flexible risers conveying oil and gas flows may be subjected to internal dynamic fluctuations associated with the spatio-temporal variations of phase densities, velocities and pressure drops. For their engineering integrity and safety, it is crucial to understand the potential structural dynamics resulting from both external and internal excitation loads. So far, the majority of research studies have been focused on structural dynamics of marine risers due to external loading with few also accounting for internal single-phase flows. A comprehensive study of the vibrations of production risers due to space-time variable internal and external multiphase flows is still lacking.

In this project, a three-dimensional phenomenological model for the analysis and prediction of vibrations of a long catenary riser will be developed. The riser conveys multiphase flow and is subjected to an external oscillating flow. This semi-empirical theoretical model will consist of nonlinear structural equations of coupled cross-flow, in-line and axial motions excited by fluctuating hydrodynamic lift and drag forces as well as internal flow dynamics. In-house experiments will be carried out at the School of Engineering wave tank to verify the model predictions. The experiment will be conducted using a pipeline riser system consisting of a horizontal pipeline and a flexible riser which are submerged in the wave tank. The test rig will be instrumented with flow meters and pressure sensors. Image processing techniques, ideally using high-speed cameras, will be used for monitoring of the internal flow regime and measuring structural vibration. These studies are complemented by direct numerical simulations through computational fluid dynamics which will provide more in-depth insight into the mechanisms initiating and controlling this fluid-structure interaction problem.

Applications should be emailed to Dr Hossein Zanganeh at . The applications should consist of a covering letter or personal statement of interest, and a CV.

Deadline for receipt of applications is 15th April 2020.

It is expected that candidates are available to register and commence study in October 2020.

Questions should initially be addressed to:
Dr Hossein Zanganeh
School of Engineering
Robert Gordon University
Riverside East, Garthdee Campus
Aberdeen, AB10 7GJ
United Kingdom

T: +44 (0) 122 426 2458

Entry Requirements
Applicants should have a First- or Second-Class UK honours degree, or equivalent, in a relevant discipline such as Mechanical Engineering or Aerospace Engineering. An MSc in a relevant subject is highly desirable. Knowledge or experience of mathematical modelling & Matlab programming is advantageous.

This studentship will cover the tuition fees only. Living costs and expenses are self-funded by the applicant.

Keywords: Multiphase Flow, Fluid-Structure Interaction, Vibrations, Steel Catenary Riser.

Funding Notes

This studentship will cover the tuition fees only. Living costs and expenses are self-funded by the applicant.

How good is research at Robert Gordon University in General Engineering?

FTE Category A staff submitted: 14.00

Research output data provided by the Research Excellence Framework (REF)

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