LES NUMERICAL SIMULATION OF CAVITATION BUBBLE SHEDDING ON ALE 25 AND ALE 15 HYDROFOILS

• 作 者: LIU De-min LIU Shu-hong WU Yu-lin XU Hong-yuan
• 机 构: State Key Laboratory of Hydro Science and Hydraulic Engineering, Department of Thermal Engineering,T
• 出 处: 水动力学研究与进展B辑
• 发表日期: 2009年6期
• 关键词: cavitation ALE hydrofoil Large Eddy Simulation (LES)

A cavitation calculation scheme is developed and applied to ALE 15 and ALE 25 hydrofoils, based on the Bubble Two-phase Flow (BTF) cavity model with a Large Eddy Simulation (LES) methodology. The Navier-Stokes equations including cavitation bubble clusters are solved through the finite-volume approach with a time-marching scheme. Simulations are carried out in a 3-D field with a hydrofoil ALE 15 or ALE 25 at an angle of attack of 8° and cavitation number σ= 2.3 with a 2×10~6, meshing system. With the time-marching, the cavitation bubble gradually grows to a steady lump shape and then produces an irregular small bubble behind the main cavitation bubble, finally shedding from the leading edge of the cloud cavitation structure. The calculated results including velocity field and pressure field are consistent with experiment data at the same Reynolds number and cavitation number. The vortex and reverse flow are observed on the hydrofoil surface.