Liutex and its applications in turbulence research / Chaoqun Liu, Center for Numerical Simulation and Modeling, Department of Mathematics, University of Texas at Arlington, Arlington, Texas, United States, Hongyi Xu, Fudan University, Shanghai, China, Xiaoshu Cai, University of Shanghai for Science and Technology, Shanghai, China, Yisheng Gao, Nanjing University of Aeronautics and Astronautics, Nanjing, China.