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Bram Starke

CFD Researcher

Research & Development

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Expertise areas
Publications
Paper
On the relation between measurable (AHR) and modelled (sand-grain) roughness heights in RANS-based full-scale ship resistance predictions

11 Oct 2021

The surface roughness of ship hulls is usually expressed in terms of an average height of the roughness (AHR), determined from measurements at a ...
Paper
On the Contribution of Roughness Effects to the Scaling of Ship Resistance

2 Jun 2021

Roughness effects are one of the main challenges of the prediction of ship resistance using traditional model tests and extrapolation procedures. ...
Paper
On the analysis of RANS-based full-scale power predictions

24 Oct 2018

Power predictions for the test case of the 2016 LR Workshop on Ship Scale Hydrodynamic Computer Simulation have been carried out to simulate the ...
Paper
RANS-based full-scale power predictions for a general cargo vessel, and comparison with sea-trial results

15 May 2017

Blind self-propulsion predictions for the 2016 LR Workshop on Ship Scale Hydrodynamic Computer Simulation have been carried out to simulate the full ...
Paper
Viscous Free-Surface Power Predictions For Self-Propulsion Using A Hybrid RANS-BEM Coupling Procedure (PARNASSOS-PROCAL)

2 Dec 2015

This paper presents results of computations for the 2015 CFD workshop in Tokyo. It briefly describes the RANS method used, the particular treatment ...
Paper
Design for Service - Effects of Loading Conditions on Powering Performances

25 Oct 2013

This paper discusses the results of a study to numerically determine the speed-power curve of a ship for several loading conditions. Therefore the ...
Paper
Optimization of a Chemical Tanker with Free-surface Viscous Flow Computations

20 Oct 2013

This paper discusses a procedure to optimize ship hull forms for minimum required power and best wake field quality, based on CFD computations of ...
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
Analysis of scale effects in ship powering performance using a hybrid RANS-BEM approach

27 Aug 2012

This paper discusses scale effects in ship powering performance using a hybrid RANS-BEM approach. The propeller action is included in the viscous ...
Paper
Prediction Of The Transom Flow Regime With Viscous Free Surface Computations

30 Sep 2011

A steady free-surface fitting RANS method is used to accurately and efficiently compute the flow near a ship‟s transom. The chosen block topology is ...
Paper
Trim wedge optimization using RANS/FS

22 Mar 2011

It is well-known that even for large displacement ships the application of a trim wedge can reduce the ship resistance by several per cent. At ...
Paper
Free-Surface Viscous Flow Solution Methods for Ship Hydrodynamics

12 Feb 2011

0
The simulationof viscousfree-surface water flow is a subject that has reached a certain maturity and is nowadays used in industrial applications, ...
Paper
Viscous free surface flow computations for self-propulsion conditions using PARNASSOS

8 Dec 2010

This paper presents results of computations for the 2010 CFD workshop in Gothenburg. It briefly describes the RANS method used, the particular ...
Magazine
CFD casts new light on transom stern design

22 Aug 2008

Reading time 3 minutes

Today most motor yachts, ferries and container ships are designed with a wide transom stern. Transom stern design can have a large effect on fuel ...
Paper
Computational Analysis of Propeller Sheet Cavitation and Propeller Ship Interaction

26 Mar 2008

This paper describes a computational procedure which is being developed for the practical analysis of propeller sheetcavitation and propeller-ship ...
Paper
Towards a CFD-based prediction of ship performance - progress in predicting full-scale resistance and scale effects

26 Mar 2008

This paper discusses scale effects on the viscous and wave resistance of ships, as found from CFD computations; and compares these with the usual ...
Magazine
CFD takes charge

17 Oct 2007

Reading time 6 minutes

Computational Fluid Dynamics (CFD) is the common denominator of various kinds of numerical flow simulations, with ship hull form optimisation the ...
Paper
Computation of transom-stern flows using a steady free-surface fitting RANS method

5 Aug 2007

This paper discusses a detailed computational study of the flow off a 2D transom stern. The steady RANS solver PARNASSOS is used, using a ...
Paper
Validation of viscous flow and wake field predictions for ships at full scale

1 Sep 2006

In this paper full-scale wake field validations for a number of ships are presented and discussed. It will be shown that accurate viscous-flow ...
Paper
Free-surface viscous flow computations for KCS and 5415 models using the PARNASSOS code

1 Mar 2005

This paper briefly describes the RANS method used in the computations by MARIN and IST, and the particular treatment of the free surface boundary ...
Paper
The prediction of scale effects on ship wave systems using a steady iterative RANS method

3 Oct 2004

Model testing of ships is usually performed at equivalent Froude numbers to obtain equal wave patterns at model scale and at full scale. However, ...
Paper
COMPUTATION OF FREE-SURFACE VISCOUS FLOWS AT MODEL AND FULL SCALE BY A STEADY ITERATIVE APPROACH

8 Aug 2004

This paper describes progress in the development of a method to compute viscous flow with free surface around a ship hull. The method solves the ...
Paper
Two examples of hull-form optimization using viscous-flow computations

1 Feb 2003

Two examples are given of the application of viscous-flow computations in hull-form design at MARIN. In the first part of the paper it is ...
Paper
Efficient Methods to Compute Steady Ship Viscous Flow with Free Surface

8 Jul 2002

The computation of the steady viscous flow with free surface around a ship hull is addressed. To improve its practical applicability, two different ...
Paper
Advances in full-scale wake-field predictions and the implications for the propeller design

1 May 2002

In the design of propellers for today’s advanced ships important design trade-offs have to be made regarding propulsion efficiency, ...
Thesis
A combined experimental and numerical study of the turbulent wake

14 Jan 2002

The main objective of the present investigation is to gain a better understanding of the flow in the far and near wake of a flat plate. To realize ...
Paper
A validation study of wake-field predictions at model and full scale Reynolds numbers

23 Sep 2001

In this paper a validation study is presented of the wake field of the St. Michaelis product tanker at model and full scale Reynolds number.
Magazine
PARNASSOS to tackle larger class hulls

1 Aug 2001

Reading time 3 minutes

MARIN's program PARNASSOS is familiar to many in the industry. At present PARNASSOS is regularly used to predict the viscous flow field around ...

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