Unsteady surface pressures on a ship hull

Unsteady surface pressure measurements at locations distributed on the surface of a ship model hull and flow visualization of the bow wave and free surface are discussed. The measurements were performed in the David Taylor Model Basin using a ship model that is approximately 40 ft. long and representative of a naval combatant at Froude numbers from 0.14 to 0.44. The pressure measurement locations are distributed over the hull surface from 15 surface pressure spectrum and limited spatial coherence measurements are discussed. Additionally, the measured surface pressure spectra are compared to predictions done using an RANS‐based formulation and predictions done using an empirical formulation that is based on historical, flat‐plate, surface pressure spectra. [Work sponsored by Office of Naval Research, Code 334.]