UNDERSTANDING THE PHYSICS OF TRIM

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ConclusionsAround 80% of the change in propulsive power origins in changedresidual resistance coefficient. Primarily from changed flow around thebulbous bowRemaining 20% are from changes in the propulsive coefficients.Trim guidance from resistance model tests or alternatively RANS CFDcan give a reasonable result. Especially if it is combined withexperience from self-propulsion tests.The potential theory CFD was found to under predict the change inperformance when trimming.
Thank you for your attentionNikolaj Lemb Larsen, nll@force.dkFORCE Technology, Denmark
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 and 8: Hull resistanceHull resistance acco
Page 9 and 10: Frictional resistance coefficientCa
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: Alternative to self-propulsion mode

UNDERSTANDING THE PHYSICS OF TRIM

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