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Thomas Lloyd

Specialist, Noise and Vibrations

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Expertise areas
Publications
Paper
Prediction of underwater radiated noise from propeller cavitation during concept design

17 Oct 2022

There is growing concern about the impact of underwater radiated noise (URN) on marine life. One of the main sources of URN of ships is propeller ...
Paper
The SOUNDS project: towards effective mitigation of underwater noise from shipping in Europe

20 Jun 2022

Continuous underwater noise from shipping has been identified as one of the main contributors to ambient noise levels in the oceans. Notwithstanding ...
Paper
Predicting cavitating propeller noise in off-design conditions using scale-resolving CFD simulations

15 Jun 2022

There is increasing awareness about the harmful impact of underwater radiated noise of shipping on the marine environment, with propeller cavitation ...
Paper
Exciting a cavitating tip vortex with synthetic inflow turbulence - A CFD analysis of vortex kinematics, dynamics and sound generation

15 Jun 2022

Cavitating tip vortices are one of the main contributors to underwater radiated noise (URN). To predict URN and evaluate propeller designs, it is ...
Paper
Broadband Trailing-Edge Noise Predictions using Incompressible Large Eddy Simulations

14 Jun 2022

Incompressible large eddy simulations of the flow over an airfoil at high Reynolds number and low Mach number have been performed, including ...
Paper
Scale-Resolving Simulations of a Circular Cylinder Subjected to Low Mach Number Turbulent Inflow

16 Nov 2021

Inflow turbulence is relevant for many engineering applications relating to noise generation, including aircraft wings, landing gears, and ...
Paper
On the use of synthetic inflow turbulence for scale-resolving simulations of wetted and cavitating flows

15 May 2021

The Delft Twist 11 Hydrofoil is a common test case for investigating the interaction between turbulence and cavitation modelling in computational ...
Paper
Transition and Turbulence Modeling for the Prediction of Cavitating Tip Vortices

1 Jan 2021

This study evaluates the influence of transition and turbulence modeling on the prediction of wetted and cavitating tip vortices for an elliptical ...
Paper
Progress in the prediction and mitigation of propeller cavitation noise and vibrations

16 Nov 2020

Comfort on board passenger vessels and pleasure craft is a primary design consideration. Furthermore, underwater radiated noise from vessels is ...
Paper
Noise measurements of a cavitating propeller in different facilities - Results of the round robin test programme

1 Oct 2020

Mitigation of shipping noise is a topical issue in marine engineering because of the dramatic increase in the levels of anthropogenic underwater ...
Paper
Evaluation of Scale-Resolving Simulations for a Turbulent Channel Flow

20 Jun 2020

Different variable resolution turbulence modelling approaches (Hybrid, Bridging models and LES) are evaluated for turbulent channel flow at Reτ=395, ...
Paper
On the accuracy of partially averaged Navier–Stokes resolution estimates

1 Dec 2019

Partially Averaged Navier–Stokes computations can employ three different approaches for specifying the ratio ofmodelled-to-total turbulence kinetic ...
Paper
Calibration of flush-mounted hydrophones using various signal types

9 Oct 2019

Measurements of cavitation-induced underwater radiated noise (URN) are carried out on a regular basis in MARIN’s Depressurised Wave Basin ...
Paper
Noise measurements of a cavitating propeller in different facilities - Results of the round-robin test programme

9 Oct 2019

Mitigation of shipping noise is a topical issue in marine engineering because of the dramatic increase in the levels of anthropogenic underwater ...
Paper
Acoustic modelling of a propeller subject to non-uniform inflow

26 May 2019

Understanding radiated noise from marine propellers is of interest from the point of view of mitigating sound pollution and avoiding detection. At ...
Paper
A sensitivity analysis of CFD transition modelling in the context of vortex roll-up prediction

13 May 2019

A sensitivity analysis of the transitional flow over a NACA662 − 415 foil and the elliptical Arndt wing is carried out. The SST turbulence model is ...
Paper
Pans simulations - low versus high Reynolds number approach

13 May 2019

Different approaches for specifying the ratio of modelled-to-total dissipation (fε) in the PANS model, based on the k−ω SST ...
Paper
Round Robin test on the underwater radiated noise of a cavitating ship propeller in open water

11 Oct 2017

Due to concerns about its effect on marine life, shipping noise is receiving increasing attention within the maritime industry. The primary noise ...
Paper
Validation of underwater radiated noise predictions for a merchant vessel using full-scale measurements

27 Aug 2017

Underwater radiated noise (URN) was previously primarily of interest in connection with the signature of naval vessels. Recently it has become ...
Magazine
Supporting silent ships - measuring underwater radiated noise from cavitating ship propellers

17 Aug 2017

Reading time 6 minutes

Have you ever had problems talking to someone in a noisy environment such as a busy restaurant? The same happens to marine animals, which use sound ...
Paper
Computational fluid dynamics prediction of marine propeller cavitation including solution verification

12 Jun 2017

This paper analyses the effect of grid refinement on computational fluid dynamics simulations of cavitating propeller flow. Refinement is made both ...
Paper
Numerical Study Of Cavitation On A NACA0015 Hydrofoil - Solution Verification

15 May 2017

The present paper analyses a series of Computational Fluid Dynamic simulations of the cavitating flow around a two-dimensional NACA0015 foil. The ...
Paper
Improved Modelling Of Sheet Cavitation Dynamics On Delft Twist11 Hydrofoil

15 May 2017

In this paper, unsteady viscous-flow cavitation predictions for a 3D hydrofoil are performed using three different approaches: 1) a pure RANS ...
Paper
Comparison of uRANS and BEM-BEM for propeller pressure pulse prediction - E779A propeller in a cavitation tunnel

3 Oct 2016

Studying pressure fluctuations from marine propellers is important when hull fatigue and comfort onboard are of interest. While potential flow ...
Paper
Towards cavitation modelling accounting for transition effects

3 Oct 2016

Cavitation is an important phenomenon which should be taken into account when designing propellers in order to minimise noise radiation, vibration ...
Paper
Influence of grid setup on the prediction of hydrofoil cavitation

3 Oct 2016

The objective of this work is to evaluate the effect of two different grid types when they are used to simulate cavitating flow using an unsteady ...
Paper
Using the FW-H equation for hydroacoustics of propellers

28 Sep 2015

Marine propeller noise and vibration has been studied in order to reduce acoustic signature, improve fatigue life and comfort onboard, and, more ...
Paper
The Potsdam propeller test case in oblique flow - prediction of cavitation patterns and pressure pulses

4 Jun 2015

We report computations performed as part of the Second International Workshop on Cavitating Propeller Performance, using the Potsdam Propeller Test ...
Paper
Marine propeller acoustic modelling - comparing CFD results with an acoustic analogy method

31 May 2015

Propeller noise and vibration is important in the design of ships in order to improve comfort, reduce signature or mitigate environmental impact. ...
Paper
Implementing The Ffowcs Williams-Hawkings Acoustic Analogy Into A Viscous CFD Solver

30 Sep 2014

This paper details the verification of an FW-H equation implementation within the CFD code, ReFRESCO, as well as comparing results obtained with ...

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