Question

1. Calculate full and model scale boundary layer thickness values of the ship whose particulars are given in the table below. Choose the appropriate formula for calculation. a. LIm 100 VIknotlー120 Cp-0.7 25 jm2A | 1.12 x 10-6 0.375 L2 5.835 Turbulent Boundary Layer |Laminar- | δ=L flat plate 0,01 +Blasius (laminaari 0 Hughes (turbulens CF 0,001 1E9 1ES E7 Ux 1E4 1E6 1E5 Re =- are the frictional coefficient values for ship and model scale, read from the figure. Calculate the biggest transom depth for the ship given in question 1. 2. Hint , Fty -h 4.hy transom depth) Find the most appropriate speed between 15-20 knots for the ship given in terms of the 1,2,.3...) 3. wave interference. (Favorable Froude numbers: Fnn

Answer 1

Ansoa Given that Saltng tato nt Poviced Ca) Callulat the valu 100 4m as Raship 20 kut x100 20(0.5144) x100 lo 83 mx00 1-12 x10 91857143857 5x thus, Ke5x10 then t tbulnt 4p LX o 35 Joox o 335 O2 Re O.2 T1 51428 57 S sp O 604m

ta model ship, - 4m -Ihan V 0 a38 25 Ra shap e las 4X (lo 88 14-614 28 5xio 1-12 x10 -u, tugbulent haw also Setip 4*O.375 O.087 m Cl46914 28 (b Compee he octional Coeticfert valuss toBAip ard mod 3 cale tatvulalion cve gen tghs G Aatial sP Re 9, O 0o Modal sip Ro .4-x 1O 0.0052. Re ship Laansoo dep ihe. 4 V o a88 m3 tO a88 4 ha.→ ha く lo .288 4 ha 5am.

tre. mdt apauiate spad. bl i5-20 knot3 4 the ship iven n uerene -the -uns have 2xCp h Can)7T Lat tαωpinbl ptoeiaus uilian al axo.7 C4n-iT 15 kuat ao net o 88 ms Aleal nalinly deTnoude nuba O.385 3aling measurs O 7 Can- Ve q,65 Ais n ,uiedl Voga 6.30 not Jlauga nel 0385 the dened Tnumbe