Huang and von Kerezek 
show mainly the effect of the wave-induced pressure gradients since 
Guilloton's potential flow method cannot be used to trace, accurately, 
the streamlines on the lower half of the hull surface. Thus, their 
results are restricted to boundary layer characteristics along 
streamlines on the hull near the free surface. 
Finally, von Kerczek'8 has applied the Cumpsty-Head-Smith”® 
method and the slender body potential flow program of Tuck and von 
Kerczek* to calculate the boundary layer on a double hull of the 
LUCY ASHTON corresponding to the experiments of Joubert and 
Matheson !? , von Kerczek'® found that the effect of streamline con- 
vergence and divergence is of overriding importance. Computed 
skin friction coefficients are in good agreement with the measured 
values. The present study uses von Kerczek's!8 computer program 
to compute the boundary layer for BRIAN BORU, the series 60 
block 60 model at zero Froude number. The computed results are 
compared with experimental data at Froude numbers equal to 0. 22, 
0.28, and 0.32. These comparisons are a first step towards deve- 
loping a boundary layer computation method for a ship at arbitrary 
Froude number, 
Shear stress distributions on the ship hull at arbitrary 
Froude number has been measured by Steele29 (Tanker Model), 
Steele and Pearce®! (High Speed Linear), and Tzou2* (Series 60 
block 60 model). All of these shear stress measurements were along 
waterlines only and considerable oscillation of the shear stress along 
the waterlines was noted 292! | In none of these experiments was 
shear stress direction measured. 
In the present study we use hot-film and Preston tubes 
located at sixty points on the hull to measure the shear stress dis- 
tribution on BRIAN BORU at various Froude numbers. The probes 
were located along four zero Froude number streamlines and along 
one waterline (14% draft). The direction of shear stress was deter- 
mined by the hot-film shear probe. In addition, pressure distribution, 
total resistance, trim, sinkage, and wave profiles were also mea- 
sured for a range of Froude numbers. A completely-detailed set of 
experimental ship resistance data is collected and presented, Avai- 
lable theories are compared with the corresponding experimental 
data. Only the boundary layer computation method will be described 
briefly in the next section. The other theories will be used without 
derivation, 
CALCULATION OF THE TURBULENT BOUNDARY LAYER 
We calculate the turbulent boundary layer on the ship hull 
1966 
