Practical Ship Hydrodynamics Episode 4 docx

... velocity components) Ship propeller interaction is difficult to capture. The inflow is taken from experiments and based on experience modified to account for scale effects 54 Practical Ship Hydrodynamics V R is ... changing the sign for the singularities on the image panels. An image for the source that 64 Practical Ship Hydrodynamics Schneekluth and Bertram (1998) give several...

Ngày tải lên: 13/08/2014, 09:20

... of coefficients: C T stuv 0.0088 049 6 0 0 0 0 0.2 045 540 3 1 0 0 0 ÐÐÐ ÐÐÐ ÐÐÐ ÐÐÐ ÐÐÐ 0.00 146 5 64 0 3 2 2 For standard Wageningen propellers the table consists of 49 coefficients for K T and56coefficientsforK Q . ... are displayed in diagrams as shown in Fig. 2 .4. The abscissa is the effective advance angle ˇ defined by: tan ˇ D V A 0.7 Ð  Ð n Ð D 40 Practical Ship Hydrodynamics...

Ngày tải lên: 13/08/2014, 09:20

... submerged, the discretization was chosen too low. The limit of upper discretization is given 244 Practical Ship Hydrodynamics Input; initialize flow field with uniform folw Compute geometry information ... integration: f 1 D  S pn 1 dS f 2 D  S pn 2 dS 236 250 Practical Ship Hydrodynamics C C B B A A z w z w Figure 7 .4 Partially submerged triangle with subtriangle ABC submerg...

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... flows 42 2.3.1 Overview of methods 42 2.3.2 Momentum theory 44 2.3.3 Lifting-line methods 45 2.3 .4 Lifting-surface methods 46 2.3.5 Boundary element methods 49 2.3.6 Field methods 50 2 .4 Cavitation ... Data Bertram, Volker Practical ship hydrodynamics 1. Ships – Hydrodynamics I. Title 623.8 0 12 Library of Congress Cataloguing in Publication Data Bertram, Volker. Pra...

Ngày tải lên: 13/08/2014, 09:20

... methods have no practical relevance for ship flows. The interested reader may find some introduction in Peyret and Taylor (1985). 1 .4. 3 Applications Practical CFD applications for ship flows concentrate ... debate over turbulence modelling for engineering applications, but for ship flows we will have to wait at least 20 Practical Ship Hydrodynamics full-scale will become availab...

Ngày tải lên: 13/08/2014, 09:20

... ˛ F 4 n c F0 86 Practical Ship Hydrodynamics ž Open-boundary condition: waves generated by the ship pass unreflected any artificial boundary of the computational domain. ž Equilibrium: the ship ... loss of speed in shallow water (Lackenby (1963)) 74 Practical Ship Hydrodynamics 0 0.2 0 .4 0.6 0.8 1.0 F n 4 / C Fo 1.0 1.1 1.2 1.3 1 .4 C T / C Fo (1+ K ) Figure 3.7 Extr...

Ngày tải lên: 13/08/2014, 09:20

... than 10 4 10 3 10 2 50 40 l (m) 0 0.2 0 .4 0.6 0.8 1.0 1.2 1 .4 1.6 1.8 w e (s −1 ) Ship passes waves −25 kn −20 kn −10 kn −5 kn 0 Following head waves 5 kn 15 kn 30. kn 0.2 0 .4 0.8 1.0 1 .4 w (s −1 ) 25 ...  D 1000 kg/m 3 ,  D 1. 145 Ð 10 6 m 2 /s. The experiments yield for the model: V m (m/s) 0.5 0.6 0.75 0.85 1.0 1.1 1.2 R T,m (N) 0 .40 2 0.5 64 0.867 1.1 14 1.5 84 2.0 54...

Ngày tải lên: 13/08/2014, 09:20

... 122 2 41 8 2 633 2 788 2 7 54 2 632 2 385 3 043 7 84 78 0 0 0 0 14. 6 16 .4 99.1 269 41 2 719 942 1 069 1 259 1 312 1 3 74 1 358 1 325 2 246 1 303 378 44 0 0 0 16 .4 18.6 99.8 110 1 24 290 3 14 4 24 451 516 ... 672 4 0 94 6 0 34 7 3 74 8 208 8 46 7 8 121 6 955 4 845 2 120 822 0 0 0 0 0 0 12.1 13.2 95.2 981 2 185 3 140 3 986 4 659 4 948 4 947 4 726 4 117 3 062 2 3...

Ngày tải lên: 13/08/2014, 09:20

... 1.25g1.25  4. 4.8 Long-term distributions Section 4. 4.6 treated ship reactions in stationary seaway. This chapter will cover probability distributions of ship reactions r during periods T with 142 Practical ... = 0.8 1.0 1.8 0.6 0 .4 0.2 H = 2.2 1.8 1 .4 1.2 1.0 0.8 0.6 0 .4 0.2 1.0 0.5 0 1.0 0.5 0 0.6 0 .4 0.2 0 1.2 1.0 0.8 0.6 0 .4 0.2 0 0 .4 0.8 w 2 B / (2 g ) w 2 B /...

Ngày tải lên: 13/08/2014, 09:20

... 621 7 49 4 0 0 Y 0 υ 4 1 552 613 99 0 Y 0 υ 5 5 526 4 344 1 277 6 262 Y 0 υ v 2 0 0 13 962 0 Y 0 υr 2 1 637 0 2 43 8 0 Y 0 υu 4 562 4 096 0 5 096 Y 0 υu 2 0 9 74 0 0 Y 0 υ 3 u 2 640 4 001 ... 600 Y 0 Prr 2 46 8 166 63 0 Y 0 0  244 26 0 0 Y 0 u 263 69 33 57 Y 0 v 15 338 16 630 8 47 0 12 095 Y 0 v 3 36 832 45 0 34 0 137 302 Y 0 vr 2 19 040 37 169 31 2 14 44 3...

Ngày tải lên: 13/08/2014, 09:20