Time Spectral Method for Rotorcraft Flow
Time Spectral Method for Rotorcraft Flow
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DOI：
10.2514/6.2008-403
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发表时间：
2008-01
期刊：
影响因子：
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通讯作者：
Nawee Butsuntorn;A. Jameson
中科院分区：
文献类型：
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作者：
Nawee Butsuntorn;A. Jameson
本文提出了一种快速有效的方法来模拟欧拉和雷诺平均纳维尔-斯托克斯方程的时间周期非定常三维旋翼机流动。基于最近发展的时间谱方法，悬停和前飞的情况下，实现了准确的结果，同时获得了传统的双时间步进格式的效率，并比非线性频域类型的求解器更简单。探讨了可压缩流动涡量约束的两个新公式。第一个配方使用的局部速度大小来缩放的限制参数和第二个使用的螺旋度来确定的限制项的强度。附加约束项对表面压力分布没有影响，升力和阻力系数的计算误差可以忽略不计。
This paper proposes a fast and efficient way to simulate time-periodic unsteady threedimensional rotorcraft flow for both Euler and Reynolds averaged Navier–Stokes equations. Based on the recently developed Time Spectral method, accurate results for hover and forward flight cases were achieved while gaining efficiency on the traditional dual time stepping scheme, and being simpler than the nonlinear frequency domain type solvers. Two new formulations for Vorticity Confinement for compressible flows were explored. The first formulation uses the local velocity magnitude to scale the confinement parameter and the second uses a helicity to determine the strength of the confinement term. The addition of the confinement term has no effect on the surface pressure distribution and negligible errors in the calculations of the coefficients of lift and drag.