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Applicability and quality of linear stability theory and linear PSE in swept laminar separation bubbles

机译:线性稳定性理论与线性PSE在扫掠层间分离气泡中的适用性和质量

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A family of laminar separation bubbles (LSB) in a swept boundary layer flow - hereafter referred to as "swept LSB"- is used to study the effect of sweep and of the propagation direction of disturbance waves on the quality of linear stability theory (LST) and solutions of the parabolized stability equations (PSE). To this end spatial LST and linear PSE solutions are qualitatively and quantitatively compared to highly resolved results of direct numerical simulations (DNS). The sweep angle of the base flow is systematically varied between 0° and 45° and a variety of Tollmien- Schlichting waves as well as the most amplified stationary cross-flow mode are investigated. It turns out, that even though LST works satisfactory in the presence of sweep, flow separation and back flow, PSE is clearly preferable in terms of accuracy.
机译:在扫描边界层流动中的一个层状分离气泡(LSB) - 以下称为“扫描LSB” - 用于研究扫描和扰动波的传播方向对线性稳定性理论的质量(LST )和抛物稳定方程(PSE)的解。对于此,与直接数值模拟(DNS)的高度解决结果相比,定性和数量地具有定性和定量的。基础流动的扫描角度在0°和45°之间系统地变化,并且研究了各种Tollmien-舍克化波以及最放大的静止横流模式。事实证明,即使在扫描的存在下,即使LST工作令人满意,在精度方面,PSE清楚地是清晰的。

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