LES Simulations using the Moving Mesh Method with Comparison to Experimental Results for a Periodic Ship Airwake

摘要

This paper describes the ship airwake simulated with sinusoidal lateral gusts over the flight deck of a Simple Frigate Shape 2 (SFS2) geometry using Computational Fluid Dynamics (CFD) simulation and experimental measurements using Time-Resolved Particle Image Velocimetry (TRPIV). The airwake with varying gust periods and magnitudes greatly affects the development of the turbulent wake over the flight deck of an aviation ship and can compromise the launch/recovery of helicopters. To derive the high-fidelity simulation of the airwake over the deck for an initial steady-state ship motion, the Large Eddy Simulation (LES) scheme was used and compared with prior experimental results. Furthermore, for the simulation of the gust effects over the ship deck, the moving mesh method with the RANS (Reynolds-Averaged Navier-Stokes) scheme was directly applied in the CFD simulations and also compared with transient wind tunnel flow field measurements. From these analyses, similar trends were investigated between the CFD results and TRPIV data for the initial steady-state ship motion; it was verified that the moving mesh computational results are in good agreement with the experimental results, in certain aspects.