Numerical Simulation of Dynamic Stall Using Near-Body Adaptive Mesh Refinement

Chaderjian, Neal M

关键词: AERODYNAMIC STALLING;    COMPUTATIONAL FLUID DYNAMICS;    GRID REFINEMENT (MATHEMATICS);    TIME DEPENDENCE;    SIMULATION;    NAVIER-STOKES EQUATION;   

RP-ID  :  ARC-E-DAA-TN58516

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Time-dependent Reynolds-averaged Navier-Stokes simulations have been carried out for a NACA 0012 airfoil and a flexible UH-60A rotor undergoing dynamic stall. The OVERFLOW computational fluid dynamics (CFD) code is used to explore the use of near-body adaptive mesh refinement (NB-AMR) for the first time on a flexible helicopter rotor in forward flight. Emphasis is placed on understanding the temporal and spatial convergence of the solutions, their numerical efficiency and stability, and establishing a grid-converged solution. Some of the remaining differences between CFD and flight-test measurements are discussed. Time-dependent flow visualization is used to provide an improved understanding of the physical mechanisms involved with two-dimensional and three-dimensional dynamic stall, and the NB-AMR process.