Measurements and Computational Predictions of A Deep-V Monohull Planing Hull

The hydrodynamics of a deep-V planing boat at high Froude numbers is a challenge to measure experimentally and simulate numerically. The U.S. Office of Naval Research has sponsored efforts to develop numerical predictive tools that can be used in the design of high speed craft. Two of these codes are Numerical Flow Analysis (NFA) and POWERSEA. NFA is a high fidelity CFD code requiring supercomputer type resources. It provides turnkey capabilities to model breaking waves around a ship, including both plunging and spilling waves, the formation of spray, and air entrainment. While POWERSEA is an added mass, strip-theory simulation code used to predict performance of planing craft in calm water and in waves. POWERSEA was developed to run on a personal computer and provide a first order assessment of accelerations and loads. To support these efforts, model tests were performed at the Naval Surface Warfare Center Carderock Division. Resistance, sinkage and trim, longitudinal wave cuts, and free-surface topologies were obtained. The model tested was as large as practical (minimizing scaling effects), while still being able to obtain the necessary speed range (6-50 knots full scale). Simulations of the hydrodynamics of the deep-V planing craft were performed utilizing NFA and POWERSEA and compared with the results from the model test.