Unsteady PTV velocity field past an airfoil solved with DNS: Part 2. Validation and application at Reynolds numbers up to Re ≤ 104
Unsteady PTV velocity field past an airfoil solved with DNS: Part 2. Validation and application at Reynolds numbers up to Re ≤ 104
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通过 DNS 解决的机翼上的不稳定 PTV 速度场：第 2 部分。雷诺数高达 Re ≤ 104 时的验证和应用
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发表时间：
2009
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通讯作者：
F. Yamamoto
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作者：
Takao Suzuki;Akira Sanse;Takashi Mizushima;F. Yamamoto
本文介绍了粒子跟踪测速（PTV）和直接数值模拟（DNS）相结合的混合非定常流模拟方法。利用时间分辨PTV在水洞中获得的激光光片上的粒子速度，以与PTV帧速率相对应的时间间隔提供给二维DNS。混合速度场逐渐逼近PTV数据的速度场，重建的速度场满足控制方程，分辨率与数值模拟相当。在第二部分中，通过将混合模拟的能力扩展到更高的雷诺数，我们模拟了NACA0012翼型在雷诺数（Re≤104）和迎角（- 5°≤α≤20°）范围内的流动，并通过将升力和阻力系数与实验结果进行比较来验证所提出的技术。并将结果与二维非定常reynolds -average Navier-Stokes （URANS）模拟结果进行了比较，表明了混合模拟相对于二维URANS的优势。
Hybrid unsteady-flow simulation combining particle tracking velocimetry (PTV) and direct numerical simulation (DNS) is introduced in the series of two papers. Particle velocities on a laser-light sheet acquired with time-resolved PTV in a water tunnel are supplied to two-dimensional DNS with time intervals corresponding to the frame rate of the PTV. Hybrid velocity fields then approach those representing the PTV data in the course of time, and the reconstructed velocity fields satisfy the governing equations with the resolution comparable to numerical simulation. In part 2, by extending the capabilities of the hybrid simulation to higher Reynolds numbers, we simulate flows past the NACA0012 airfoil over ranges of Reynolds numbers (Re ≤ 104) and angles of attack (−5° ≤ α ≤ 20°) and validate the proposed technique by comparing with experimental results in terms of the lift and drag coefficients. We also compare the results with unsteady Reynolds-averaged Navier–Stokes (URANS) simulation in two-dimensions and show the advantages of the hybrid simulation against two-dimensional URANS.