Practical Ship Hydrodynamics Episode 3 docx

... employed for ship flows, because they require very small time steps for the necessary very fine spatial discretization. A popular implicit scheme is the Crank–Nicholson scheme. 32 Practical Ship Hydrodynamics R R P P Grid ... Poisson 36 Practical Ship Hydrodynamics ž Unstructured grids Unstructured grids allow the largest flexibility in grid generation, but require far more effor...

Ngày tải lên: 13/08/2014, 09:20

... 0.7nD 2 0.5 0.4 0 .3 0.2 0.15 0.08 0.06 0.05 0.1 0.1 0.15 0.2 0 .3 0.4 0.5 0.6 0.8 1.5 2.0 6′ v 1.0 Upper limit for merchant ship propellers t Figure 2. 13 Burill diagram Resistance and propulsion 65 3. 1.2 ... as: w D 1  V A V s 3 Resistance and propulsion 3. 1 Resistance and propulsion concepts 3. 1.1 Interaction between ship and propeller Any propulsion system interacts wit...

Ngày tải lên: 13/08/2014, 09:20

... Ð  Ev 2 C 1 30 E v A  Ev 2 C 1 30 E v B  Ev 2 C 1 30 E v C  Ev 2  1 90 E v A  EvEv B  Ev  1 90 E v B  EvEv C  Ev  1 90 E v C  EvEv A  Ev  246 Practical Ship Hydrodynamics Once ...   S 0 p s n 1 dS f 3 D  S pn 3 dS   S 0 p s n 3 dS f 5 D  S pzn 1  xn 3  dS   S 0 p s zn 1  xn 3  dS S is the actually wetted surface. S 0 is the w...

Ngày tải lên: 13/08/2014, 09:20

... Data Bertram, Volker Practical ship hydrodynamics 1. Ships – Hydrodynamics I. Title 6 23. 8 0 12 Library of Congress Cataloguing in Publication Data Bertram, Volker. Practical ship hydrodynamics / Volker ... approach 68 3. 2.1 Towing tanks and experimental set-up 68 3. 2.2 Resistance test 69 3. 2 .3 Method ITTC 1957 71 3. 2.4 Method of Hughes Prohaska 73 3. 2.5 Method of...

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

... rudder. Resistance and propulsion 73 Table 3. 1 Recommended values for C A L pp (m) c A 50–150 0.00 035 –0.0004 150–210 0.0002 210–260 0.0001 260 30 0 0 30 0 35 0 0.0001 35 0–4000 0.00025 3. 2.4 Method of Hughes–Prohaska This ... L 2 i2 L 2 i 3 L i 3  L i2 L i 3 C L i2 /D i CC i DL 2 i1 L 2 i 3 L i 3  L i1 L i 3 C L i1 /D i CD i D L 2 i1 L 2 i2 L i2  L i1 ...

Ngày tải lên: 13/08/2014, 09:20

... 96 Practical Ship Hydrodynamics What is the resistance of a ship with L pp D 150 m if the ship is geometri- cally and dynamically similar to the base ship and the approach ... (Lap (1954), Keller (19 73) ) with a correlation coefficient c A D 0 .35 Ð10 3 . 6. A ship of 150 m length sails with 15 kn on water of 12 m depth. It experi- ences a dynamic sinkage amidships of 1 m and...

Ngày tải lên: 13/08/2014, 09:20

... 117 3 062 2 31 8 215 0 0 0 0 0 13. 2 14.6 97.7 547 1 038 1 527 2 122 2 418 2 633 2 788 2 754 2 632 2 38 5 3 0 43 784 78 0 0 0 0 14.6 16.4 99.1 269 412 719 942 1 069 1 259 1 31 2 1 37 4 1 35 8 1 32 5 ... 246 1 30 3 37 8 44 0 0 0 16.4 18.6 99.8 110 124 290 31 4 424 451 516 534 559 557 1 072 908 544 197 43 3 0 18.6 21.0 100.0 32 32 71 86 106 126 132 151 154 162 32 7 31 4 268...

Ngày tải lên: 13/08/2014, 09:20

... supplied by the motion of the cylinder: time average of n 33 Pu 3 Pu 3 D 1 2 n 33 ω e ju 3 j 2 144 Practical Ship Hydrodynamics For practical purposes, one tries to obtain quasi three-dimensional ... pressure measured by 150 Practical Ship Hydrodynamics A z denotes the ratio of amplitude of the radiated waves and the motion ampli- tude: A 2 z D jhj 2 ju 3 j 2 D ω 3...

Ngày tải lên: 13/08/2014, 09:20

... 39 6 Y 0 P vv 2 21 560 34 899 10 30 1 0 Y 0 Pr 714 771 222 600 Y 0 Prr 2 468 166  63 0 Y 0 0 244 26 0 0 Y 0 u 2 63 69 33 57 Y 0 v 15 33 8 16 630 8 470 12 095 Y 0 v 3 36 832 45 034 0  137 30 2 Y 0 vr 2 19 ... 594 X 0 v 2 889 3 908 1 35 5 3 279 X 0 r 2 237  838 151 571 X 0 υ 2 1 598 1 34 6 696 2 879 X 0 v 2 u 0 1 833 2 4 63 2 559 X 0 υ 2 u 2 001 2 536...

Ngày tải lên: 13/08/2014, 09:20