UNDERSTANDING THE PHYSICS OF TRIM

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Wetted surface areaWetted surface area (m 2 )162501623016210Results for Froude number = 0.128Trim -2.0m 0.0m 2.0mS [m 2 ] 16181.4 16223.6 16241.3ΔS [%] -0.3% 0.0% 0.1%ΔP D S [%] -0.3% 0.0% 0.1%16190Trim (m)16170-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2The wetted surface area changesmainly aft due to “flat” stern region.Changes at the propulsive power areminimum.
Frictional resistance coefficientCalculated accordingly to ITTC-standards.C F0.075( log ( Re)− ) 2102Where Re is the Reynolds number for the flowalong the hull.ReSpeed and kinematic viscosity (v) are constant,but the water line length changes with trim.Results for Froude number = 0.128==V ⋅ L wlνTrim -2.0m 0.0m 2.0mΔL WL [%] -2.5% 0.0% 1.8%Re [-] 1.91E+09 1.95E+09 2.00E+09C F [-] 1.415E-03 1.412E-03 1.407E-03ΔP D Lwl [%] 0.2% 0.0% -0.3%Changes at the propulsive power are minimum.
Page 1 and 2: UNDERSTANDING THEPHYSICS OF TRIMGre
Page 3 and 4: Change in propulsive power due to t
Page 5 and 6: Trim guidancePropeller power deviat
Page 7: Hull resistanceHull resistance acco
Page 11 and 12: Residual resistance coefficient (2/
Page 13 and 14: Propulsive efficiencyDescribed by t
Page 15 and 16: Wake fractionShould be as high as p
Page 17 and 18: Relative rotative efficiencyFunctio
Page 19 and 20: Alternative to self-propulsion mode
Page 21: Thank you for your attentionNikolaj

UNDERSTANDING THE PHYSICS OF TRIM

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