Case 3.6
Conditions:
· Bare hull with bilge keels
·
Towing condition in calm water
·
FRφ;
s =
2.93×10-4,
t = -3.47×10-2°
·
Re=
2.56×106,
Fr=0.138,
initial roll angle j= 10°
·
Wetted surface area at rest (S/L2)
= 0.1476
Reference:
(3-4) Irvine, M., Longo, J., Stern, F. (2004), “Towing Tank Tests for Surface Combatant for Free Roll Decay and Coupled Pitch and Heave Motions,” Proc. 25th ONR Symposium on Naval Hydrodynamics, St Johns, Canada.
Instructions for Simulation: Simulation should be performed for SIX periods of the roll.
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Table/ Figure # |
Items |
EFD Data |
Submission Instructions |
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|
Data File |
Image |
Image File/Table |
Sample |
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3.6-T |
ERSS
for force and moment coefficients and roll angle time history |
Refer
to sample file for details |
Filename: [Identifier]_T1_3-6.xls |
||
|
3.6-1 |
Time history of CTX |
(Dashed lines are plotted to shows the EFD trend) |
Filename: [Identifier]_CTX_3-6.jpg X-axis range: 1.0 ≤ t*L/U ≤ 2.0 (1 Flow time) Y-axis range:
−0.075 ≤ CTX ≤ 0.075 EFD: Open circle; CFD: Solid black line. |
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3.6-2 |
Time history of roll angle |
Filename: [Identifier]_Roll_3-6.jpg X-axis range: 0 ≤ t*L/U ≤ 2.5 Y-axis range:
−10° ≤ j ≤ 10° EFD: Open circle; CFD: Solid black line. |
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3.6-3 |
Mean wave-elevation ζ contours |
Filename: [Identifier]_z_mean_3-6.jpg Axis: -0.1£ x £1.25; 0£ y £0.4 Contours levels: -0.02 £ z/L £ 0.02, #levels = 11 Contour style: Solid ( positive) and broken (negative)
lines |
|||
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3.6-4 |
Wave-elevation ζT
contours during second cycle of roll decay: t/Te = 0, 1/4, 1/2,
3/4 |
|
Filename: [Identifier]_z_0_3-6.jpg [Identifier]_z_1-4_3-6.jpg
[Identifier]_z_1-2_3-6.jpg
[Identifier]_z_3-4_3-6.jpg Axis: -0.1£ x £1.25; 0£ y £0.4 Contours levels: -0.02 £ z/L £ 0.02, #levels = 11 Contour style: Solid ( positive) and broken (negative)
lines |
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3.6-5 |
Contours of U velocity at x/LPP=0.675 during
second cycle of roll decay: t/Te = 0, 1/4, 1/2, 3/4 |
|
Filename: [Identifier]_U_0_3-6.jpg
[Identifier]_U_1-4_3-6.jpg
[Identifier]_U_1-2_3-6.jpg [Identifier]_U_3-4_3-6.jpg Axis: -0.065£ x £-0.03; -0.055£ y £-0.01 Contours levels: 0.7 £ U £ 1.0, #levels = 11 Contour style: Solid lines |
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3.6-6 |
Contours of V velocity at x/LPP=0.675 during
second cycle of roll decay: t/Te = 0, 1/4, 1/2, 3/4 |
|
Filename: [Identifier]_V_0_3-6.jpg
[Identifier]_V_1-4_3-6.jpg [Identifier]_V_1-2_3-6.jpg
[Identifier]_V_3-4_3-6.jpg Axis: -0.065£ x £-0.03; -0.055£ y £-0.01 Contours levels: -0.15 £ V £ 0.1, #levels = 11 Contour style: Solid ( positive) and broken (negative)
lines |
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3.6-7 |
Contours of W velocity at x/LPP=0.675 during
second cycle of roll decay: t/Te = 0, 1/4, 1/2, 3/4 |
|
Filename: [Identifier]_W_0_3-6.jpg
[Identifier]_W_1-4_3-6.jpg
[Identifier]_W_1-2_3-6.jpg
[Identifier]_W_3-4_3-6.jpg Axis: -0.065£ x £-0.03; -0.055£ y £-0.01 Contours levels: -0.1 £ W £ 0.14, #levels = 11 Contour style: Solid ( positive) and broken (negative)
lines |
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Hull data at x/LPP=0.675 during second cycle
of roll decay: t/Te = 0, 1/4, 1/2, 3/4 (for plotting EFD data in Figs. 3.6-5, 6 and 7) |
T_0_Hull.dat (t/Te = 0) T_1-4_Hull.dat (t/Te
= 1/4) T_1-2_Hull.dat (t/Te
= 1/2) T_3-4_Hull.dat (t/Te
= 3/4) |
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*[Identifier] should be [Institute Name]-[Solver Name]. For example, if your institute is IIHR and solver is CFDShip-Iowa V.4, identifier should be IIHR-CFDShipV4.
All figures have aspect ratio of 1:1.
·
CFD
predicted force coefficients should be reported using the wetted surface area
at rest ( S/L2).
·
,
where FX is the total
resistance.