allow SSP to anticipate environmental direc- tions, for which the CFD predicted strong cross flows at the entrance of the tunnel, by using the rotating capabilities of HUB.
To get a better understanding of the wave patterns inside the docking tunnel, unsteady wave simulations were performed using ComFLOW. Special attention was paid to possible resonant wave modes inside the tunnel. The results of the CFD provided SSP with critical wave amplification factors inside the tunnel, together with the envi- ronmental conditions for which these amplifications occur. With this knowledge, SSP can set criteria for redirecting the HUB, using the weather tight tunnel doors and possibly other mitigation means to avoid large water motions inside the tunnel.
Simulation study To provide SSP with the answers it is looking for, the knowledge obtained from the CFD simulations were only half of the equation. The capabilities of the Austal trimaran crew boat and cap- tain also had to be taken into account. To that end, a realistic and fast-time simulation model of the HUB, environment and crew boat was developed and put to the test on MARIN’s bridge simulator. To achieve realis- tic simulation exercises, the environmental
conditions on the simulator were tuned using the CFD simulations and a detailed model of the interior of the tunnel was made including moveable fenders that guide the vessel into the tunnel. An accu- rate manoeuvring model of the trimaran was created in cooperation with Austal. With the use of the CFD results the HUB’s rotational capabilities and weather tight doors were exploited to the maximum to
create the optimum entry condition for any given environment.
In the end, a week of extensive simulations found that the SSP HUB was indeed able to accommodate a safe entry in the harshest environments – a conclusion made possible by a unique combination of CFD analysis, real-time simulations and comprehensive simulator exercise.
Visualisation of streamlines of the wind velocity around the hub and through the tunnel report 19
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24
