JIPS

Joint Industry Project

breakin CFD

Running

BreaKin CFD is aiming at confirmation, further analysis and understanding of underlying physical processes of the BreaKin JIP model test data through CFD simulations.

SCOPE OF WORK

To confirm the findings of the BreaKin JIP described above and to get more insights in scale effects involved in local loading and the negative vertical impact force, it is proposed to carry out CFD simulations. Initially the following set of simulations are proposed:

  • 1-phase CFD simulations of steepest wave condition (one simulation already carried out during BreaKin JIP).
  • 2-phase CFD simulations of steepest wave condition to confirm change of wave shape due to presence of air flow between wave and deck box, at different airwater density ratios and surface tension values (equivalent to scale 1:25, 1:50 and 1:1).
  • Sensitivity study of impact due to small variations in incoming wave characteristics (similar variations will be used as found during repeat measurements in wave basin).

TOOLS

ComFLOW The proposed scope of work will be carried out with ComFLOW. ComFLOW is a 1-phase / 2-phase CFD free-surface flow solver with sharp interface reconstruction (PLIC VoF). ComFLOW is specifically designed for the simulation of complex freesurface flows in offshore and maritime applications. In previous JIP projects relevant related topics have been studied, implemented and validated, such as:

  • sloshing in LNG containment systems
  • air entrapment during wave impacts (“cushioning”)
  • wave run-up, green water and deck impacts on ships and offshore structures
  • deterministic reconstruction of steep and breaking waves (by means of iterative wave matching).

Recent 2-phase developments include a new generation of ghost fluid algorithm using both state-of-the-art surface tension and interface-velocity decoupling models, to capture the energy exchange and instabilities at the free surface at a very high level of accuracy.

SCHEDULE AND PARTICIPATION FEE

Participation fee is 25k Euros for BreaKin participants and 35k Euros for non-BreaKin participants.

JIP members only