Effect of Ship Motion on DD-963 Ship Airwake Simulated by Multizone Navier-Stokes Solution

摘要

the airwake about a DD-963 ship configuration is simulated by using a multi-xone, thin-layer Navier-Stokes method. The ship's superstructure is modelled by two blocked structures, followed by a flight deck and a lower missile deck. The ship motion is represented by change of ship attitude in a steady state flow environment. Two ship attitudes are considered: (1) the ship at two-degree pitch, and (2) the ship at one-degree pitch and five-degree roll. The freestream has a wind speed of 15.44 m/s (30 knots) at a direction of 30 degrees. The flow is fully turbulent with a Reynolds number of 177 million based on ship length. In general, the flow is largely separated behind the superstructure. The ship pitched bow down yields an airwake thinner than that of a ship at even keel traveling at the same speed. The ship with pitch or roll has larger local reversed flow regions characterized by backwardfacing-step type flow.