Douwe Rijpkema

Publications

Paper

Ship course-keeping in waves using sample-efficient reinforcement learning

1 Feb 2025

Maintaining a steady course in waves is important for ships for various reasons such as safety, fuel efficiency, and comfort. This has commonly been ...

Paper

General reinforcement learning control for AUV manoeuvring in turbulent flows

1 Oct 2024

Turbulence induces unsteady loads on autonomous underwater vehicles (AUVs) and may present a significant navigation challenge. This leads to ...

Paper

An Experimental Study on Visualisation and Passive Control of Model Propeller Boundary Layers

20 Mar 2024

This paper examines the complications of a laminar propeller boundary layer during towing tank model testing and proposes a solution in the form of ...

Paper

Uncertainty quantification in the prediction of cavitation inception of the Duisburg Propeller Test Case

16 Oct 2022

Accurate quantitative prediction of marine propeller performance and cavitaiton inception criteria has important implications for the eventual ship ...

Paper

Estimating parameter and discretization uncertainties using a laminar–turbulent transition model

15 Nov 2021

For computational fluid dynamic (CFD) simulations at intermediate Reynolds numbers, laminar-to-turbulent transition plays an important role in the ...

Paper

Parameter Uncertainty Quantification applied to the Duisburg Propeller Test Case

30 Sep 2019

At model-scale conditions (diameter-based Reynolds number below 106), laminar-to-turbulent transition plays an important role on the performance of ...

Paper

Propeller Performance Prediction in an Artificially Generated Wake Field Using RANSE

30 Sep 2019

Marine propellers usually operate behind a ship and are subject to a non-uniform inflow field due to the ship’s boundary layer and wake system. This ...

Paper

On the use of the γ−R˜eθt transition model for the prediction of the propeller performance at model-scale

15 Dec 2018

The goal of the present work is to improve the prediction of propeller performance at model-scale using a local correlation transition model. ...

Paper

Recent Developments in Computational Methods for the Analysis of Ducted Propellers in Open Water

5 Aug 2018

This paper presents an overview of the recent developments at IST and MARIN in applying computational methods for the hydrodynamic analysis of ...

Paper

Prediction of the Open-Water Performance of Ducted Propellers with a Panel Method

19 Mar 2018

In the present work, a comparison between the results obtained by a panel code with a Reynolds-averaged Navier-Stokes (RANS) code is made to obtain ...

Paper

On the Use of the γ-Reθ Transition Model for the Prediction of the Propeller Performance at Model-Scale

12 Jun 2017

The goal of the present work is to improve the prediction of propeller performance at model-scale using a local correlation transition model. An ...

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

Validation Exercises of Mathematical Models for the Prediction of Transitional Flows

11 Sep 2016

This paper presents Validation exercises of mathematical models for the simulation of flows where transition from laminar to turbulent regime plays ...

Paper

Computational Study On Power Reduction By A Pre-Duct For A Bulk Carrier

2 Dec 2015

This paper presents computational results of the flow around the Japanese Bulk Carrier (JBC). The overall agreement with the experiments for all ...

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

Numerical Studies For Verification And Validation Of Open-Water Propeller RANS Computations

15 Jun 2015

In this paper, viscous flow calculation using a RANS method are presented for two marine propellers in open-water conditions at model-scale. A ...

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

Viscous flow simulations of propellers in different Reynolds number regimes

31 May 2015

Full-scale propeller performance prediction is mostly based on model-scale experiments that are extrapolated to fullscale values. Computational ...

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

Determination of Scaled Wind Turbine Rotor Characteristics from 3 Dimensional RANS Calculations

4 Feb 2015

Previous studies showed the importance of three-dimensional effects when calculating the characteristics of a scaled downturbine rotor [1, 6, 7]. ...

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 ...

Paper

A Comparison of Panel Method and RANS Calculations for a Ducted Propeller System in Open-Water

5 May 2013

In this paper, a comparison between results of a panel method and a RANS solver is made for a ducted propeller system in open-water. The panel ...

Paper

Numerical simulation of propeller-hull interaction and determination of the effective wake field using a hybrid RANS-BEM approach

5 May 2013

In this study propeller-hull interaction is investigated numerically using a combination of a steady viscous CFD method (RANS) for the ship flow and ...

Paper

Viscous-Flow Calculations On An Axial Marine Current Turbine

1 Jul 2012

In this paper, the flow over a marine current turbine is studied. As a test case, the benchmark turbine published in [1, 2] is selected. A ...

Magazine

CFD facilitates better understanding of scale effects

16 Dec 2011

Reading time 6 minutes

Ship resistance and propulsion are principal factors affecting the fuel efficiency of maritime transport. To be able to accurately predict a ship's ...

Paper

Viscous Flow Computations On Propulsors - Verification, Validation And Scale Effects

22 Mar 2011

In this paper, viscous flow calculations using CFD code ReFRESCO are shown for three propulsors in open-water configuration: the INSEAN E779A ...