Benchmark experimental and numerical database on transitional cavity flow

We present an experimental benchmark database for the transitional cavity flow. The database is obtained by planar Particle Image Velocimetry measurements at the median plane of the cavity model, for Reynolds numbers between 6,300 and 19,000 based on the cavity height. A detailed uncertainty analysis of the experimental results is performed via the correlation statistics method for PIV uncertainty quantification and linear error propagation.<br>The data contain the following variables:- x/H and y/H: locations (relative to the cavity H) in the streamwise and transverse directions, respectively-u, v: streamwise and transverse velocity components, respectively. These quantities are normalized with respect to the free-stream velocity.- TKE: turbulent kinetic energy. The TKE is normalized with respect to the square of the free-stream velocity.- Rxy: shear Reynolds stress. Rxy is normalized with respect to the square of the free-stream velocity.- Uncertainties of the above quantities (also normalized)- isValid: parameter that assumes the value 1 for valid vectors and 0 for invalid vectors.

本研究构建了一套面向转捩空腔流动的实验基准数据集。
该数据集通过在空腔模型中截面处开展平面粒子图像测速法（Particle Image Velocimetry，PIV）测量获取，实验基于空腔高度定义的雷诺数范围为6300至19000。
研究采用相关统计法开展PIV不确定度量化分析，并结合线性误差传递方法对实验结果进行了详尽的不确定度评估。
数据集包含以下变量：
- x/H与y/H：分别为流向与横向方向上以空腔特征高度H为基准的位置坐标；
- u、v：分别为流向与横向速度分量，上述物理量均以来流速度为基准进行无量纲化处理；
- 湍流动能（turbulent kinetic energy，TKE）：以来流速度的平方为基准进行无量纲化；
- Rxy：剪切雷诺应力，以来流速度的平方为基准进行无量纲化；
- 上述各物理量的不确定度（同样完成无量纲化处理）；
- isValid：有效性标识参数，有效速度矢量对应取值为1，无效矢量则取值为0。