Abstract
The paper presents a numerical roll damping assessment of the
intact DTMB 5415 naval ship at zero speed. Free model motions from four
experimental roll decays with initial heeling angle of 4.0, 13.5, 19.58
and 24.50 deg, performed previously at the University of Strathclyde,
Glasgow, have been analysed and the one with 19.58 deg initial heeling
has been chosen for the Computational Fluid Dynamic (CFD) analysis. All
calculations are performed using CD Adapco Star CCM+ software
investigating the accuracy and efficiency of the numerical approach for
case of high initial heeling angle of bare hull. In the numerical
procedure the verification analysis of mesh refinement and time step was
performed with the aim to investigate the numerical error/uncertainty.
For grid refinement and time step, validation and verification procedure
has been performed according to the Grid Convergence Index (GCI) method.
Moreover, to verify the main source of the modelling error/uncertainty,
the effect of degrees of freedom are evaluated, comparing the numerical
results with the experimental results. Conclusions are identifying best
practice for roll decay simulations commenting the accuracy of numerical
results and required calculation time.
intact DTMB 5415 naval ship at zero speed. Free model motions from four
experimental roll decays with initial heeling angle of 4.0, 13.5, 19.58
and 24.50 deg, performed previously at the University of Strathclyde,
Glasgow, have been analysed and the one with 19.58 deg initial heeling
has been chosen for the Computational Fluid Dynamic (CFD) analysis. All
calculations are performed using CD Adapco Star CCM+ software
investigating the accuracy and efficiency of the numerical approach for
case of high initial heeling angle of bare hull. In the numerical
procedure the verification analysis of mesh refinement and time step was
performed with the aim to investigate the numerical error/uncertainty.
For grid refinement and time step, validation and verification procedure
has been performed according to the Grid Convergence Index (GCI) method.
Moreover, to verify the main source of the modelling error/uncertainty,
the effect of degrees of freedom are evaluated, comparing the numerical
results with the experimental results. Conclusions are identifying best
practice for roll decay simulations commenting the accuracy of numerical
results and required calculation time.
| Original language | English |
|---|---|
| Pages (from-to) | 209-223 |
| Number of pages | 15 |
| Journal | Ocean Engineering |
| Volume | 162 |
| Early online date | 29 May 2018 |
| DOIs | |
| Publication status | Published - 15 Aug 2018 |
Keywords
- DTMB 5415 intact ship
- uncertainty analysis
- verification and validation (V&V)
- roll decay
- CFD
- EFD