Bram Starke
senior researcher
Research & Development
CFD Development
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Expertise areas
Publications
Paper
Resistance extrapolation for ships with a wetted transom stern
23 Jun 2025
This paper studies the viscous resistance of a ship with a wetted transom stern, and its scale effect. For predicting the resistance of a ship with ...
Paper
A Verification and Validation Study of RANS Based Roughness Models at Model and Full Scale Reynolds Numbers
8 Jul 2024
Most flows that occur in naval applications exhibit large Reynolds numbers (Re > 107), which means that roughness elements need to be extremely ...
Paper
Numerical calculation and evaluation of extrapolation coefficients as used in speed-power predictions based on model tests
9 Oct 2022
A comparative analysis has been made of the extrapolation of model tests results using form factors and wake scale effects obtained from both a ...
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
0The 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
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 ...
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 ...
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 ...
