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Arjen Koop

Senior Researcher/Teamleader

Research & Development

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Publications
Paper
Experimental Flow-Induced Motions of a FOWT Semi-Submersible Type (OC4 Phase II Floater)

Feb 1, 2021

F low-induced motions (FIM) are an issue for floating offshore structures, such as multicolumnplatforms, as the phenomenon can decrease the fatigue ...
Paper
Assessing RANS Numerical and Modeling Properties in the Simulation of the Flow Around Captive and Moving Cylinders

Aug 1, 2020

In many Engineering applications, the Reynolds-Averaged Navier-Stokes (RANS) equations are still used to simulate high Reynolds numbers (turbulent) ...
Paper
Development and Verification of Modeling Practice for CFD Calculations to Obtain Current Loads on FPSO

Aug 1, 2020

Current loads are important input parameters for mooring studies. To accurately predict the motions of moored vessels these quantities should be ...
Paper
HIGH-FIDELITY MODELLING OF FLOATING OFFSHORE WIND TURBINE PLATFORMS

Aug 1, 2020

There are already several examples of commercially operating floating offshore wind turbines (FOWTs) delivering electricity to the grid. These ...
Paper
Force Measurements of the Flow Around Arrays of Three and Four Columns With Different Geometry Sections, Spacing Ratios, and Incidence Angles

Apr 1, 2020

An experimental campaign for the flow around a stationary array of three and four columns with low aspect ratio, H/L=1.5, piercing the water free ...
Paper
CFD Simulation of Semi-Submersible Floating Offshore Wind Turbine Under Pitch Decay Motion

Nov 3, 2019

The application of a computational fluid dynamics (CFD) code to simulate the response of a semi-submersible floating wind turbine under pitch decay ...
Paper
Predicting Roll Damping for Barge-Type FPSO Using CFD

Jun 9, 2019

An accurate prediction of the non-linear roll damping is required in order to calculate the resonant roll motion of moored FPSO’s. Traditionally, ...
Paper
URANS predictions of low-frequency damping of a lNGC

Jun 9, 2019

The horizontal motions of a moored offshore structure in waves are dominated by the resonance phenomena that occur at the natural frequencies of the ...
Paper
Current Status of Wind Load Calculations with CFD

Jun 10, 2018

In this paper the current status is presented for accurate and fast determination of wind load coefficients using Computational Fluid Dynamics ...
Paper
Predicting wind loads on single vessels and in side by side offloading configuration for FPSO and shuttle tanker using CFD

Jun 10, 2018

This paper presents the results of the wind loads on typical offshore vessels at model scale 1:250 obtained with CFD simulations. A FPSO, shuttle ...
Paper
Wind Shielding Estimation of a Vessel in Side by Side Configuration using Disturbed Velocity Field from CFD

Feb 14, 2018

When two vessels are in a side-by-side configuration, the vessel in the wake experiences significantly lower wind forces. This phenomenon is known ...
Paper
Experimental study of the column shape and the roughness effects on the vortex-induced motions of deep-draft semi-submersible platforms

Feb 1, 2018

Experiments regarding the VIM of SS platforms with four columns were carried out to investigate the effects of the surface roughness and the column ...
Paper
Experimental Study on the Vortex-Induced Motions (VIM) of a Semi-Submersible Floater in Waves

Jun 25, 2017

Recent studies suggest that the vortex-induced motions (VIM) of a semi-submersible found in model tests over-predicts the response in the field, ...
Paper
Determining Thruster-Hull Interaction for a Drill-Ship Using CFD

Jun 25, 2017

In this paper CFD results are presented for the thrusterhull interaction effects for a drillship with 6 azimuthing thrusters. The results using ...
Paper
Validation exercises for the calculation of the flow around a squared column with rounded corners at high Reynolds numbers with the rans equations

Jun 25, 2017

This paper presents Validation studies, i.e. evaluation of the modelling error, for the ensemble averaged Navier-Stokes (RANS) equations ...
Paper
Validation: What, Why And How

Jun 24, 2016

Offshore and Naval engineering have relied on physical models, i.e. experimental fluid dynamics (EFD), for several decades. Although the role of ...
Paper
Investigation on reasons for possible difference between VIM response in the field and in model tests

Jun 19, 2016

Floating offshore structures, such as production semi-submersibles and spars, can exhibit significant in-line and transverse oscillatory motions ...
Paper
Determining side-by-side current loads using CFD and Model Tests

Jun 19, 2016

When two vessels are positioned close to each other in a current, significant shielding or interaction effects can be observed. In this paper the ...
Paper
Model test investigation of the influence of damping on the vortex induced motions of deep draft semi-submersibles using a novel active damping device

Jun 19, 2016

Vortex Induced Motions (VIM) of semi-submersibles occur when the vortex shedding frequency is close to the natural frequency of the semi-submersible ...
Paper
Simulation and Development of a Wind-Wave Facility for Scale Testing of Offshore Floating Wind Turbines

Jun 19, 2016

The development of a new wind-wave facility for offshore floating wind turbine testing can be complex; outfitting existing basins with wind ...
Paper
CFD Investigation on Scale and Damping Effects for Vortex Induced Motions of a Semi-Submersible Floater

May 2, 2016

Available field measurements of semisubmersibles indicate that the Vortex Induced Motion (VIM) response is typically found to be smaller than what ...
Paper
Validation of CFD for run-up and wave impact on a semi submersible

Mar 9, 2016

To assess the integrity and safety of structures offshore, prediction of run-up, green water, and impact loads needs to be made during the ...
Magazine
CFD provides valuable insight into current loads on offshore constructions

Aug 21, 2015

Reading time 6 minutes

CFD has become an accurate, efficient and cost-effective design tool to predict the current loads on typical offshore constructions.
Paper
Shallow Water Current Loads on a LNG Carrier Using CFD

Jun 1, 2015

To determine shallow water effects on current loads for an LNG Carrier, CFD calculations with MARIN’s CFD code ReFRESCO have been carried out. The ...
Paper
Wind Shielding Estimation of a Tandem Vessel Using Disturbed Velocity Field from CFD

Feb 1, 2015

The wind forces experienced by a receiving transport vessel in a tandem configuration will be influenced by so-called shielding effects, caused by ...
Magazine
ReFRESCO-operation gives unique opportunities in CFD

Dec 6, 2014

Reading time 3 minutes

Last autumn MARIN launched an innovative initiative to start a partnership with its clients for a maritime Computational Fluid Dynamics' (CFD) ...
Paper
Modelling Thruster-Hull Interaction with CFD

Jun 18, 2013

The application of CFD for the analysis of thruster interactions effects (or degradation effects) is still a largely unexplored area. Quantifying ...
Magazine
Complex model tests on MOHO NORD Tension Leg Platform

Apr 14, 2013

Reading time 6 minutes

In an ambitious campaign the MOHO NORD TLP was extensively tested in wind, waves and current.
Magazine
Joint R&D in JIPs

Apr 14, 2013

Reading time 6 minutes

The offshore industry works closely together to share knowledge, experience and costs. Here an update on the latest Joint Industry Projects. ...
Paper
Efficient Numerical Simulation of Unsteady Cavitating Flows Using Thermodynamic Tables

Aug 13, 2012

A computational method based on the Euler equations for unsteady flow is employed to predict the structure and dynamics of unsteady sheet cavitation ...
Paper
Predicting Wind Loads On Typical Offshore Vessels Using CFD

Jul 1, 2012

Within the OO1 and OO2 “Offloading Operability“ JIPs, wind-tunnel measurements were carried out to determine the wind loads on a number of vessels, ...
Paper
Forces on bilge keels in regular and irregular oscillating flow

Jun 17, 2012

This paper presents a validated methodology to calculate the oscillatory loads on bilge keels of ships operating at zero forward speed in irregular ...
Magazine
CFD - an increasingly important research tool

Apr 20, 2012

Reading time 6 minutes

Report highlights successful applications of Computational Fluid Dynamics (CFD) in a number of Joint Industry Projects in which model tests and CFD ...
Magazine
Tackling the unknowns about Vortex Induced Motions

Apr 20, 2012

Reading time 6 minutes

Even after extensive model tests in the past years, many uncertainties still surround Vortex Induced Motions (VIM). Report explains several recent ...
Magazine
Determining wind loads with CFD

Dec 16, 2011

Reading time 3 minutes

Report highlights how Computational Fluid Dynamics (CFD) are playing an increasingly important role in the assessment of wind loads.
Paper
Viscous-Flow Calculations For Model And Full-Scale Current Loads On Typical Offshore Structures

Sep 29, 2011

In this paper, CFD calculations for current loads on an LNG carrier and a semi-submersible are presented, both for model and full-scale situations, ...
Paper
RANS Predictions Of Roll Viscous Damping Of Ship Hull Sections

Sep 29, 2011

The unsteady flow around a forced rolling hull section with and without bilge keels is computed using URANS code ReFRESCO. In this paper, extensive ...
Paper
Predicting Roll Added Mass And Damping Of A Ship Hull Section Using CFD

Jun 20, 2011

In this paper, the flow around a forced rolling body is analyzed with MARIN in-house CFD code ReFRESCO. The objective is to assess if the code can ...
Paper
Model-Scale And Full-Scale CFD Calculations For Current Loads On Semi-Submersible

Jun 20, 2011

In this paper results of CFD calculations with the MARIN in-house code ReFRESCO are presented for the JBF-14000 Semi-Submersible designed by Huisman ...
Magazine
Increasing interest in tests for Vortex Induced Motions

Apr 26, 2011

Reading time 6 minutes

For Marin 2010 was a very busy year for Vortex Induced Motions (VIM) tests. Report highlights the latest tests.
Magazine
MARIN has the wind in its sails pledging commitment to offshore wind sector

Apr 26, 2011

Reading time 6 minutes

With the growth in renewable energy, there is an increasing focus on offshore wind. The offshore wind industry is maturing and going further ...
Paper
Analysis of the Velocities in the Wake of an Azimuthing Thruster, using PIV Measurements and CFD Calculations

Oct 12, 2010

The wake flow behind a ducted azimuthing thruster was investigated, both in open water conditions and with the thruster placed under a schematical ...
Magazine
Pioneering purpose-built wind turbine installation vessels under test

Aug 26, 2010

Reading time 6 minutes

For large offshore wind farms significant time and therefore, cost can be reduced by using a purpose-built installation vessel. MARIN carried out a ...
Paper
Predicting Wind Loads for FPSO Tandem Offloading Using CFD

Jun 6, 2010

To assess the applicability and accuracy of CFD calculations on typical offshore configurations the wind loads for FPSO tandem offloading is ...
Paper
Predicting Loads On An LNG Carrier With CFD

Jun 6, 2010

The Current Affairs Joint Industry Project was initiated to develop the understanding and tools for the assessment of current loads on offshore ...
Paper
Unsteady Sheet Cavitation on Three-dimensional Hydrofoil

May 30, 2010

An unstructured grid computational method for solving the Euler equations for inviscid compressible unsteady flow is employed to predict the ...
Magazine
CFD for offshore applications

Apr 26, 2010

Reading time 6 minutes

In 2009, MARIN took a major step towards the commercial application of Computational Fluid Dynamics (CFD) tools for offshore-related problems. This ...
Thesis
Numerical Simulation of Unsteady Three-Dimensional Sheet Cavitation

Aug 31, 2008

This thesis deals with the theory and the numerical simulation of sheet cavity flows on arbitrary lifting bodies like hydrofoils and propeller ...
Paper
Design of Twisted Cavitating Hydrofoil using a Barotropic Flow

Sep 11, 2006

For the design of a twisted hydrofoil in a cavitation tunnel a computational method for simulating three-dimensional ...