1990
DOI: 10.2514/3.10526
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Two-dimensional numerical simulation of shear-layer optics

Abstract: Two-dimensional Euler equations are solved directly using the second-order, explicit, MacCormack predictorcorrector and Godunov methods alternately for the investigation of free-shear-layer optical properties. The optical effects of coherent structures in the mixing layer are identified. As expected, far-field optical quality of a laser beam is degraded the most when a laser beam passes through the edge of the large eddies. The far-field optical performance can be improved significantly by controlling the cohe… Show more

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Cited by 42 publications
(9 citation statements)
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References 13 publications
(12 reference statements)
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“…Beam jitter was modeled, and high-order distortions were largely unaccounted for. Tsai & Christiansen (1990) solved Euler equations numerically to study the degradation of a laser beam by a plane mixing layer at low Mach numbers (M 1 = 0.2 and M 2 = 0.1 for the two air streams). Their solutions were able to capture qualitative features of large-scale coherent structures including vortex pairing, but this is a result of the numerical viscosity in the simulation code based on a combination of MacCormack and Godunov methods.…”
Section: Computation Of Aberrating Flowsmentioning
confidence: 99%
“…Beam jitter was modeled, and high-order distortions were largely unaccounted for. Tsai & Christiansen (1990) solved Euler equations numerically to study the degradation of a laser beam by a plane mixing layer at low Mach numbers (M 1 = 0.2 and M 2 = 0.1 for the two air streams). Their solutions were able to capture qualitative features of large-scale coherent structures including vortex pairing, but this is a result of the numerical viscosity in the simulation code based on a combination of MacCormack and Godunov methods.…”
Section: Computation Of Aberrating Flowsmentioning
confidence: 99%
“…Cassady, Birch & Terry (1989) obtained unsteady two-dimensional solutions for compressible flow over a cavity and analysed its induced optical distortion. Tsai & Christiansen (1990) solved two-dimensional Euler equations for a free shear layer and studied the effects of flow forcing on optical distortions. More elaborate approaches involved Reynoldsaveraged Navier-Stokes (RANS) calculations using a turbulence model such as the k-ε model.…”
Section: Introductionmentioning
confidence: 99%
“…系, 相干结构与光束相互作用模型可以表示为如图 11 所示的简化模型 [53] 。 1982 年 , Oster 和 Wygnanski 研 究 表 明 [65] [62] 以 及 Tsai 和 Christiansen 相 关 的数值研究 [66] 表明: 通过一定周期激励改变相干结构的力学参量会伴随着 -…”
Section: -unclassified
“…式中 f 为基波频率,θ 为剪切层的初始动量厚度,Ū 为剪切层平均对流速度。 1985 年, Roberts 等发现: 相对于无扰动流场, 加入剪切层 280 Hz 基波扰动后, 在频率锁定区域(即剪切 层 的 增 长 率 为 0 的 区 域), -R S 值 从 0.66 增 加 到 0.91 [73] 。 1989 年 , Tsai 和 Christiansen 基 于 欧 拉 方 程 数 值 计 算 速度分别为 70.4 m/s 和 35.2 m/s 的二维非定常可压缩剪切层流场的流场参数分布、 基于光线追迹计算了 "近 场 " 的 相 位 分 布 、 基 于 物 理 光 学 方 法 计 算 口 径 为 2.56 cm 的 He-Ne 激 光 的 远 场 分 布 [66]…”
Section: -unclassified