Parametric roll simulation in SHIPFLOW 6.3
The video shows the motion of the DTC container ship experience parametric roll. The prediction was produced with the release 6.3 of SHIPFLOW MOTIONS.
In this simulation the wave encounter frequency is approximately twice the natural roll frequency and the wavelength of the encountering wave is approximately equal to the ship length. The ship was given an initial roll of one degree in order to trigger the roll. No viscous damping was added in this case.
The major news are:
- Improved accuracy of ship motion and added resistance in waves
- Improved MOTIONS robustness
- Added user defined damping coefficients e.g. roll damping
- Multiple improvements to overlapping grid algorithm
Resistance and propeller efficiency
The first published article in a series of articles on shape optimization of ship sterns with CFD has been released. It demonstrates the importance of optimizing for the delivered power rather than the resistance which can be misleading. This requires the computations of the self propulsion with CFD that can be very computational demanding. However, it is shown that with the new fast solver in SHIPFLOW 6 the optimizations can be performed on a modern workstation or in a small cluster.
The article is called Optimization of ship sterns – part 1 and can be found in under the menu Cases.