考虑附加约束条件和多重网格近似，通过VIC+从粒子轨迹重构4D流场

2019/07/17   下载量： 0 次

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利用LaVision的DaVis软件平台，加载抖盒子分析（STB）软件模块，考虑附加约束条件和多重网格近似，通过VIC+从粒子轨迹重构4D流场。

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The present work investigates how to enhance Vortex-in-Cell-plus (VIC+) [1], capable of
reconstructing 4D flow field from dense time-resolved particle track measurement such as Shake-the-Box (STB,4D-PTV) [2, 3]. This study focuses on two aspects: removal of the necessity of initial condition and improvement of computation speed. For the former, the criteria of the parameters, for updating boundary condition and for weighting time derivatives, are modified to be evaluated from STB without an initial guess of the flow field. In addition, the continuity equation and Navier-Stokes equation from which additional constraints to flow field are derived are newly integrated into the cost function of VIC+ in order to update the
boundary condition progressively and reliably. For the computational speed, a concept of the iterative multigrid approximation [4] is adopted in order both to save the computational resource and to provide more desirable flow field by cropping out the erroneous computation boundary before triggering a successive VIC+ optimization for the finer grid scheme. STB measurement under the densely seeded condition is taken into account and its fluid structures, pressure field, and computational performances are demonstrated.

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北京欧兰科技发展有限公司
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