通过涡度或局部环流测量 assimilate 几乎湍流的 Rayleigh-Bénard 流:一项计算研究
Assimilation of nearly turbulent Rayleigh-Bénard flow through vorticity or local circulation measurements: a computational study
AI总结:
本文提出一种连续数据同化算法,用于仅使用涡度或局部环流测量的二维 Bénard 对流问题。算法通过在涡度方程中加入阻尼项来约束模型,数值结果表明当仅使用空间粗粒测量涡度时,算法的近似解收敛于未知参考解。
摘要:
我们介绍了一种连续(降尺度)数据同化算法,用于仅使用涡度或局部环流测量的二维 Bénard 对流问题。在该算法中,将一个阻尼项加入涡度方程以约束模型。我们的数值结果表明,当仅使用空间粗粒测量涡度时,算法的近似解收敛于未知参考解(涡度和温度)对应的二维 Bénard 对流问题的测量。此外,这种收敛是通过比满足严格分析估计所需分辨率更粗糙的数据实现的。
英文摘要:
We introduce a continuous (downscaling) data assimilation algorithm for the 2D Bénard convection problem using vorticity or local circulation measurements only. In this algorithm, a nudging term is added to the vorticity equation to constrain the model. Our numerical results indicate that the approximate solution of the algorithm is converging to the unknown reference solution (vorticity and temperature) corresponding to the measurements of the 2D Bénard convection problem when only spatial coarse-grain measurements of vorticity are assimilated. Moreover, this convergence is realized using data which is much more coarse than the resolution needed to satisfy rigorous analytical estimates.
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