MSC Assignment - Numerical modelling of turbulenc...
MSC Assignment - Numerical modelling of turbulence-foil interaction
Publication date17 Jan 2023
FieldComputational Fluid Dynamics (CFD), Research & Development
ContactArtur Lidtke, A.Lidtke@marin.nl
For MARIN ACADEMY we are looking for a MSc student:
Title: Numerical modelling of turbulence-foil interaction Supervisors: T. Lloyd, A. Lidtke, Fernanda dos Santos and Prof. dr. Kees Venner. Duration: A minimum of nine months, starting as soon as possible Candidate profile: The candidate should have a background in a relevant discipline, such as naval architecture, aerospace engineering or mechanical engineering, preferably with an interest in acoustics. Both theoretical and practical knowledge of computational fluid dynamics (CFD) is required, with experience in using Linux being desirable. Basic programming skills in a scripting language (Python, Matlab) would also be a plus. Description: Noise from lifting surfaces such as foils and propeller blades is important in numerous applications across the maritime, aerospace and renewable energy sectors. In the context of marine propellers, there is a desire to reduce the environmental impact of ships on sea life, while naval vessels are also required to maintain a low signature while operating. Therefore it is important to be able to predict noise levels during design, so that competing designs can be compared, and evaluation against requirements can be made, prior to vessel construction. One of the primary noise mechanisms in this case is generated by the impingement of inflow turbulence on the leading edge of the propeller blades. Successful prediction of this type of noise requires knowledge of the complex interaction between the turbulence and local geometry and flow at the leading edge, which can be challenging to simulate.
Figure 1: Stern of a generic submarine hull fitted with a rotating propeller simulated with ReFRESCO. Inflow turbulence, visualised as vorticity iso-contours, may be seen to impinge on the propeller, leading to broadband turbulence noise. This project will look at using the CFD code ReFRESCO developed at MARIN for performing such simulations, in order to inform noise predictions and learn more about the local flow characteristics for a foil test case. A rich set of experimental data from measurements performed in the University of Twente’s AeroAcoustic Wind Tunnel is available for validation purposes. The following primary tasks are envisaged:
A literature review on turbulence-foil interaction, leading edge noise, and associated numerical prediction techniques;
Setting up and performing scale-resolving CFD simulations for selected test case(s);
Extensive data post-processing and comparison against wind tunnel measurement data;
Analysis, interpretation and reporting of results, in the form of a thesis and paper(s).
During the project, the student is expected to spend the majority of time at the Maritime Research Institute Netherlands (MARIN) in Wageningen. A bursary is available to cover subsistence costs. Contact: Fernanda dos Santos: email@example.com or Artur Lidtke (firstname.lastname@example.org).