The novel Lagrangian particle tracking method Shake-The-Box (STB) has been applied to a synthetic turbulent channel flow test case based on projections of particles which follow the DNS simulated flow towards four cameras. A benchmark test for 3D particle reconstruction and velocity field estimation has been carried out between the partners at ONERA and DLR-AS-EXV on two step, four step and fully time resolved particle image series from virtual cameras. Furthermore, an experimental set-up for measuring the flow of a large scale turbulent impinging jet has been explained. The set-up consists of six PCO.Dimax high-speed cameras operating between 1 and 3.9 kHz frame rate together with pulsed LED arrays illuminating HFSB in the jet flow of maximal velocities up to 18 m/s. The STB measurement domain consists of a wall-bounded volume covering a stream- and spanwise area of 500 x 500 x 200 mm³. A comprehensive set of relatively dense Lagrangian track data was reconstructed from several time resolved sequences. The data enables an accurate and high resolution measurement of the velocity, acceleration and Reynolds stresses. Furthermore, an interpolation algorithm regularized by the incompressible NS-equation named FlowFit has been applied resulting in the corresponding time-resolved 3D velocity and acceleration vector and pressure field volumes on a regular grid using the time series of irregularly distributed Lagrangian track data. With the present data coherent structures and their pressure dynamics close to the wall will be investigated based on synchronous flush mounted microphone measurements.

将新的拉格朗日粒子跟踪方法Shake The Box（STB）应用于一个基于粒子投影的模拟湍流通道实验中。ONERA和DLR-AS-EXV的合作伙伴在两步、四步和全时间分辨率的虚拟摄像机粒子图像序列上进行了三维粒子重建和速度场估计的基准测试。此外，还介绍了一种测量大尺度湍流冲击射流流动的实验装置。该装置由6台PCO.Dimax高速摄像机组成，其帧速率在1至3.9 kHz之间，脉冲LED阵列在最大速度达18 m/s的射流中照亮HFSB。STB测量区域包括一个壁面边界体积，覆盖500 x 500 x 200 mm³的流和翼展面积。从多个时间分辨序列重建了一组完整的相对密集的拉格朗日轨道数据。这些数据可以精确和高分辨率地测量速度、加速度和雷诺应力。此外，还应用了一种由不可压缩NS方程正则化的FlowFit插值算法，利用不规则分布的拉格朗日轨道数据的时间序列，在规则网格上生成相应的时间分辨三维速度、加速度矢量和压力场体积。在现有数据的基础上，我们将基于同步嵌入式麦克风测量，研究相关结构及其靠近墙壁的压力动态。

来自 ResearchGate 

作者：Daniel Schanz，Sebastian Gesemann，Florian Huhn...