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Numerical Simulation of Ship Motion Stabilization by an Activated U ...

Numerical Simulation of Ship Motion Stabilization by an Activated U ...

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<strong>Numerical</strong> <strong>Simulation</strong> <strong>of</strong> <strong>Ship</strong><strong>Motion</strong> <strong>Stabilization</strong> <strong>by</strong> <strong>an</strong><strong>Activated</strong> U-tube Anti-Roll T<strong>an</strong>kTheresa Kleefsm<strong>an</strong>Department <strong>of</strong> MathematicsUniversity <strong>of</strong> GroningenP.O. Box 8009700 AV Groningen August 2000


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1ComFloExperiment0.5water height PS (m)0−0.5−1−1.50 50 100 150 200 250time (s)30ComFloExperimentk:


7654roll <strong>an</strong>gle (deg)3210−1−2−30 5 10 15 20 25 30 35 40 45 50time10.8ComFloExperimentk:


150ComFlo 100x44 no stretchingComFlo 200x88 stretchedExperiment10050roll moment (Nm)0−50−100−1500 5 10 15 20 25 30 35 40 45 50time (s)150100Noslip, eddy visc.=10 −2Noslip, eddy visc.=10 −3Free slipExperimentk/:5NI#=L;Sˆ#354‹0à •Èq81Ú/&%–ldox&3ÑU),+¨),%I1‡Ï2+.34x&'º!#&9{K/&+¨)¨x-d­xr)¨!/2î 1Š),'.11²:³-΋³9³$Ì50roll moment (Nm)0−50−100−1500 5 10 15 20 25 30 35 40 45 50time (s)k:SÔ 9G/*u2qŸ%JK9_ï)H+'¥dxa)!/&îc1Š),'.18²:³$΋³9³-Ì-dÏ—+$35xk:


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0.040.02roll <strong>an</strong>gle (rad)0−0.02−0.040 10 20 30 40 50 60 70 80time (sec)k:


1210roll moment (Nm)14 x 104 roll frequency (rad/s)ComFloExperiments1801601401208phase lag (deg)100806604042020 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1ComFloExperiments00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1roll frequency (rad/s)ÝSÞàß9áâUãÃäåæ ê çÍë&ì ÊAÊ^í ì íïî—ð¦ñò$í”ó³ÊÛô


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