Test
case 3a.6: Pure sway
Conditions
- Captive
pure sway motion in still water
- Fixed
(heave=5.855mm & pitch=-0.136°)
- Without
rudders
- With bilge
keels
Pre scribed PMM motions:
- Sway
motion:
- Sway
velocity:
- Sway acceleration:
- Heading
angle:
- Yaw rate:
- Yaw acceleration:
|
|
|
|
|
|
|
|
|
0.280 |
4.643´106 |
1.531 |
8.0210 |
0.1584 |
10.0 |
0.174 |
: corresponding maximum drift angle
Items and Remarks
|
Figure Number |
Items |
Remarks |
|
Fig. 3a.6-1 |
Axial velocity contours and cross flow vectors (x/LPP=0.135) |
4 PMM phases; 0°, 45°, 90°, 135° To be compared with experiment
results pdf |
|
Fig. 3a.6-2 |
Transverse velocity contours (x/LPP=0.135) |
|
|
Fig. 3a.6-3 |
Vertical velocity contours (x/LPP=0.135) |
|
|
Fig. 3a.6-4 |
Turbulent kinetic energe contours (x/LPP=0.135) |
|
|
Fig. 3a.6-5 |
Axial vorticity contours (x/LPP=0.135) |
|
|
Fig. 3a.6-6 |
Axial velocity contours and cross flow vectors (x/LPP=0.935) |
4 PMM phases; 0°, 45°, 90°, 135° To be compared with experiment
results pdf |
|
Fig. 3a.6-7 |
Transverse velocity contours (x/LPP=0.935) |
|
|
Fig. 3a.6-8 |
Vertical velocity contours (x/LPP=0.935) |
|
|
Fig. 3a.6-9 |
Turbulent kinetic energe contours (x/LPP=0.935) |
|
|
Fig. 3a.6-10 |
Axial vorticity contours (x/LPP=0.935) |
- Coordinate
system for comparision is ship-fixed at FP on the undisturbed waterplane
(x positive downstream, y positive starboard side, z positive upward).
, 
where, 
is towing carriage speed, 
is the gravitational
acceleration and 
is the kinematic viscosity of water.
- All
quantities are non-dimensionalized with water density (
), carriage speed (),and the length between perpendiculars (
).
, 
, 
, 
where, 
, 
, 