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Joop Helder

Senior Project Manager

Offshore / Renewable ENergy Team

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Expertise areas
Publications
Paper
Screening wave conditions for the occurrence of green water events on sailing ships

Aug 15, 2021

Design loads for extreme wave events on ships, such as slamming and green water, are hard to define. These events depend on details in the incoming ...
Paper
Non-Linear Wave Run-Up Along the Side of Sailing Ships Causing Green Water on Deck - Experiments and Deterministic Calculation

Aug 1, 2020

Experiments with a flat plate in oblique waves at different speeds, wave conditions, headings and drift speed were done to evaluate non-linear wave ...
Paper
Linking Experimental and Numerical Wave Modelling

Mar 13, 2020

Experimental or numerical analysis of the response of ships and other floating structures starts with correct environmental modelling. The ...
Magazine
Extreme wave loading… the future is hybrid!

Apr 25, 2018

Reading time 3 minutes

Since 2003, MARIN has built up an extensive trackrecordin testing floating wind turbines. To date, themain method for model testing has been based ...
Magazine
JIPs - sharing experiences and building knowledge

Apr 21, 2017

Reading time 6 minutes

Joint Industry Projects are still one of the most important steps in the development, sharing and application of knowledge. Participants are welcome ...
Magazine
Joining forces to capture extreme loads

Apr 21, 2017

Reading time 3 minutes

The possible occurrence of negative air gaps on offshore structures in storm conditions has recently attracted significant attention. A new JIP ...
Paper
Validation of CFD for a deterministic breaking wave impact on a semi submersible

Oct 3, 2016

For structural design, prediction of run-up, green water and impact loads have to be taken into account, to assure the integrity and safety of ...
Magazine
Joint R&D in Offshore JIPs

Apr 22, 2016

Reading time 6 minutes

The offshore industry works closely together to share knowledge, experience and costs. Here we give an update on the latest Joint Industry Projects. ...
Magazine
BreaKin JIP will provide insight into breaking wave loads on offshore structures

Apr 22, 2016

Reading time 3 minutes

BreaKin is a new joint industry project addressing the kinematics of breaking waves and linking these to the wave loads that may result.
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
MARIN uses CFD to assess SSPs revolutionary new HUB design

Aug 21, 2015

Reading time 6 minutes

MARIN combined CFD with fast-time simulations and intensive testing on its bridge simulator to explore the full potential of the new SSP HUB design.
Paper
Turbulence Modeling for Locally-Refined Free-Surface Flow Simulations in Offshore Applications

Jun 21, 2015

To study extreme hydrodynamic wave impact in offshore and coastal engineering, the VOF-based CFD simulation tool ComFLOW is being developed. ...
Paper
Deterministic simulation of breaking wave impact and flexible response of a fixed offshore wind turbine

Jun 5, 2015

The effects of operational wave loads and wind loads on offshore mono pile wind turbines are well understood. For most sites, however, the water ...
Magazine
MARIN spearheads advanced wave impact modelling initiatives

Aug 29, 2014

Reading time 6 minutes

Due to the complexity of wave impact modelling, MARIN is starting several new research initiatives.
Magazine
The impact of ships that pass in the night... or in the day

Aug 2, 2011

Reading time 6 minutes

MARIN is involved in several projects examining the effects of passing ships. Here we present the many ways we help to shed light on this phenomenon.

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