Arjen Koop
senior researcher | teamleader
Research & Development
Waves & Motions
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Publications
Paper
OC6 Phase IV: Validation of CFD Models for Stiesdal TetraSpar Floating Offshore Wind Platform
28 nov. 2024
With only a few floating offshore wind turbine (FOWT) farms deployed anywhere in the world, FOWT technology is still in its infancy, building on a ...
Paper
High-fidelity CFD simulations of two tandemly arrayed wind turbines under various operating conditions
4 nov. 2024
In this study, we perform computational fluid dynamic (CFD) simulations for the NTNU Blind Test 2 experiment in which the wake of two turbines was ...
Paper
OC6 project Phase IV: validation of numerical models for novel floating offshore wind support structures
29 apr. 2024
This paper provides a summary of the work done within Phase IV of the Offshore Code Comparison Collaboration, Continued with Correlation and ...
Magazine
MARIN investigates VIM response of semi-submersible floaters
20 dec. 2023
MARIN develops a novel co-simulation approach to assess the effect of mooring and risers on the Vortex Induced Motion (VIM) response of a ...
Paper
CFD Simulations of Two Wind Turbines Operating in Line
1 sep. 2023
In this study, we perform CFD simulations for the NTNU Blind Test 2 experiment, in which two turbines were placed in a closed-loop wind tunnel and ...
Paper
CFD Simulations of Two Wind Turbines Operating in Line
19 jun. 2023
Generally, the wake behind a wind turbine is characterized as a reduction in wind velocity and an increase in turbulence level compared to the free ...
Paper
Verification Study for CFD Simulations of NTNU Blind Test 1 Wind Turbine
12 jun. 2023
Computational Fluid Dynamics (CFD) simulations with fully resolved turbine geometries are increasingly popular for wind turbine aerodynamic ...
Paper
Investigating the Effect of Damping Originating from Mooring and Risers on the VIM Response of a Semi-Submersible Floater Using Coupled CFD-Time-Domain Simulations
1 mei 2023
The Vortex Induced Motion (VIM) response of multi-column semi-submersible floaters may have a significant impact on the predicted fatigue life of ...
Paper
Verification and validation of CFD simulations of the NTNU BT1 wind turbine
1 mrt. 2023
Results obtained from CFD simulations are sensitive to many numerical settings, such as grid spacing, time increment, turbulence models, etc. ...
Paper
High-fidelity CFD simulations for the wake characteristics of the NTNU BT1 wind turbine
9 dec. 2022
In this work, we present the results of the wake characteristics of a model-scale horizontal-axis wind turbine (HAWT) obtained from high-fidelity ...
Paper
Validation of CFD simulations of the moored DeepCwind offshore wind semisubmersible in irregular waves
15 sep. 2022
This article examines the use of computational fluid dynamics (CFD) simulations to predict the response of a floating wind platform to ...
Paper
Hydrodynamic response of a FOWT semi-submersible under regular waves using CFD - Verification and validation
15 aug. 2022
In this work an extensive verification and validation study is performed to evaluate the accuracy and credibilityfor CFD simulations of hydrodynamic ...
Paper
CFD simulations of a performance-scaled wind turbine
13 jun. 2022
In the present study, we focus on the CFD simulations for the performance and the rotor-generated wake of a model-scale wind turbine which was ...
Paper
Comparison of Different Wind Turbine Modeling Strategies in CFD Simulations
5 jun. 2022
Computational Fluid Dynamics (CFD) tools are now widely used in the aerodynamic analysis of wind turbines. To simulate the turbine different ...
Paper
Urans predictions of drift loads on a semi submersible in steep waves
5 jun. 2022
The last decade, many semi-submersible designs have been tested in MARIN’s wave basins as a result of recently modified classification society ...
Paper
Development and verification of modelling practice for CFD calculations to obtain hydrodynamic damping of offshore vessels
5 jun. 2022
Estimates for hydrodynamic damping on offshore vessels are important input parameters for simulations studies onvessels operating at sea, e.g. ...
Paper
CFD Prediction of Wind Loads on FPSO and Shuttle Tankers during Side-by-Side Offloading
12 mei 2022
This study entailed the estimation of wind loads performed using computational fluid dynamics (CFD) simulations for four typical offshore vessels ...
Paper
OC6 Phase 1a - CFD Simulations of the Free-Decay Motion of the DeepCwind Semisubmersible
5 jan. 2022
Currently, the design of floating offshore wind systems is primarily based on mid-fidelity models with empirical drag forces. The tuning of the ...
Paper
Verification and validation of CFD simulations for semi-submersible floating offshore wind turbine under pitch free-decay motion
15 dec. 2021
In this paper a detailed verification and validation study is performed to evaluate the accuracy of CFD simulations for a semi-submersible floating ...
Paper
OC6 Phase 1b - Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible
1 dec. 2021
During the previous OC5 project, state-of-the-art mid-fidelity engineering tools for floating wind systems were found to consistently underpredict ...
Paper
A Joint-Industry Effort to Develop and Verify CFD Modelling Practice for Vortex-Induced Motion of a Deep-Draft Semi-Submersible
22 jun. 2021
Platform Vortex Induced Motion (VIM) is an important cause of fatigue damage on risers and mooring lines connected to deep-draft semi-submersible ...
Paper
Qualification Criteria for the Verification of Numerical Waves – Part 1: Potential-Based Numerical Wave Tank (PNWT)
22 jun. 2021
There is an increasing trend towards using numerical wave simulations for the design of offshore structures, especially for the stochastic ...
Paper
CFD Simulations of Near and Far Wakes of Two Turbines in a Tandem Configuration
20 jun. 2021
The offshore wind energy market is growing rapidly globally. To be more competitive in the energy market, the levelized cost of energy (LCOE) of ...
Paper
Experimental Flow-Induced Motions of a FOWT Semi-Submersible Type (OC4 Phase II Floater)
1 feb. 2021
F low-induced motions (FIM) are an issue for floating offshore structures, such as multicolumnplatforms, as the phenomenon can decrease the fatigue ...
Paper
Investigation of Nonlinear Difference-Frequency Wave Excitation on a Semisubmersible Offshore-Wind Platform With Bichromatic-Wave CFD Simulations
18 okt. 2020
The natural surge and pitch frequencies of semisubmersible offshore wind platforms are typically designed to be below the wave frequencies to avoid ...
Paper
Assessing RANS Numerical and Modeling Properties in the Simulation of the Flow Around Captive and Moving Cylinders
1 aug. 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
1 aug. 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
1 aug. 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
1 apr. 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
Using CFD to determine scale effects on current loads of offshore vessels in side-by-side configuration
1 jan. 2020
The scale effects and the shielding effects on the current loads for typical offshore vessels in side-by-side configuration are investigated using ...
Paper
CFD Simulation of Semi-Submersible Floating Offshore Wind Turbine Under Pitch Decay Motion
3 nov. 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
9 jun. 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
9 jun. 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
Predicting wind loads on single vessels and in side by side offloading configuration for FPSO and shuttle tanker using CFD
10 jun. 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
Current Status of Wind Load Calculations with CFD
10 jun. 2018
In this paper the current status is presented for accurate and fast determination of wind load coefficients using Computational Fluid Dynamics ...
Paper
Wind Shielding Estimation of a Vessel in Side by Side Configuration using Disturbed Velocity Field from CFD
14 feb. 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
1 feb. 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
25 jun. 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
Validation exercises for the calculation of the flow around a squared column with rounded corners at high Reynolds numbers with the rans equations
25 jun. 2017
This paper presents Validation studies, i.e. evaluation of the modelling error, for the ensemble averaged Navier-Stokes (RANS) equations ...
Paper
Determining Thruster-Hull Interaction for a Drill-Ship Using CFD
25 jun. 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 - What, Why And How
24 jun. 2016
Offshore and Naval engineering have relied on physical models, i.e. experimental fluid dynamics (EFD), for several decades. Although the role of ...
Paper
Determining side-by-side current loads using CFD and Model Tests
19 jun. 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
19 jun. 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
Investigation on reasons for possible difference between VIM response in the field and in model tests
19 jun. 2016
Floating offshore structures, such as production semi-submersibles and spars, can exhibit significant in-line and transverse oscillatory motions ...
Paper
Simulation and Development of a Wind-Wave Facility for Scale Testing of Offshore Floating Wind Turbines
19 jun. 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
2 mei 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
9 mrt. 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
21 aug. 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
1 jun. 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
1 feb. 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
6 dec. 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
18 jun. 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
14 apr. 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
14 apr. 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
13 aug. 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
1 jul. 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
17 jun. 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
20 apr. 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
20 apr. 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
16 dec. 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
RANS Predictions Of Roll Viscous Damping Of Ship Hull Sections
29 sep. 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
Viscous-Flow Calculations For Model And Full-Scale Current Loads On Typical Offshore Structures
29 sep. 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
Model-Scale And Full-Scale CFD Calculations For Current Loads On Semi-Submersible
20 jun. 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 ...
Paper
Predicting Roll Added Mass And Damping Of A Ship Hull Section Using CFD
20 jun. 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 ...
Magazine
MARIN has the wind in its sails pledging commitment to offshore wind sector
26 apr. 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 ...
Magazine
Increasing interest in tests for Vortex Induced Motions
26 apr. 2011
Reading time 6 minutes
For Marin 2010 was a very busy year for Vortex Induced Motions (VIM) tests. Report highlights the latest tests.
Paper
Analysis of the Velocities in the Wake of an Azimuthing Thruster, using PIV Measurements and CFD Calculations
12 okt. 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
26 aug. 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
6 jun. 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
6 jun. 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
30 mei 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
26 apr. 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
31 aug. 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
11 sep. 2006
For the design of a twisted hydrofoil in a cavitation tunnel a computational method for simulating three-dimensional ...
Paper
Roll Damping Due to Lift Effects on High Speed Monohulls
1 jun. 1991
In this paper the characteristics of the roll behaviour of fast ships will be discussed and illustrated. The attention will be focussed on the ...