  A 1/8.25 scale-model of the U.S. Navy Research Vessel ATHENA was tested in
regular head-sea waves to obtain data for validation of computational fluid
dynamics (CFD) predictive tools. The experiments were performed in the David
Taylor Model Basin at the Naval Surface Warfare Center (NSWC). With the model
towed fixed in head-seas, horizontal and vertical loads on the model were
obtained at two Froude numbers, $F_r=0.25$ and $F_r=0.43$. The model was run at
two conditions of head-sea wavelengths corresponding to $\lambda=2L_o$ and
$\lambda=1/2L_o$ with $H/\lambda=0.03$, where $L_o$ is the length of the model
and $H=2 a$ is the wave height. The wave field perturbations induced by the
head-sea waves were quantified from free-surface images generated by a laser
light sheet. Predictions of the horizontal and vertical loads on the model in
regular head sea waves were made with the Numerical Flow Analysis (NFA) code.
Numerical predictions of the wave-field perturbations were compared with the
experimental data and the correlation coefficients have been computed.
