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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

Oct 11, 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

Jun 2, 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

Oct 24, 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

May 15, 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)

Dec 2, 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

Oct 25, 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

Oct 20, 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

May 5, 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

Aug 27, 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

Sep 30, 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

Mar 22, 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

Feb 12, 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

Dec 8, 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

Aug 22, 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

Mar 26, 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

Mar 26, 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

Oct 17, 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

Aug 5, 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

Sep 1, 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

Mar 1, 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

Oct 3, 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

Aug 8, 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

Feb 1, 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

Jul 8, 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

May 1, 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

Jan 14, 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

Sep 23, 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

Aug 1, 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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