A letter for objective Liutex
作者机构：Department of MathematicsUniversity of Texas at ArlingtonArlingtonTexas76019USA School of Mathematical ScienceSoochow UniversitySuzhou215006China
出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)
年 卷 期：2022年第34卷第5期
页 面：965-969页
核心收录：
学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）]
基 金：Texas Advanced Computation Center University of Texas at Arlington, UTA
主 题：Objective Liutex vortex structure Galilean invariance
摘 要：Vortex structures,detected by the existing popular vortex identification methods,of the same case are generally different if the results are measured by different observers,who are moving with different coordinate *** coordinate systems can be inertial or *** invariance can solve the moving observer problems in different inertial coordinate systems.A variable is invariant under Galilean transformation is called Galilean *** invariant vortex identification methods can provide invariant vortex structures based on different inertial ***,for some situations,the observers are non-inertial,e.g.,the observer is sitting on an aircraft which is accelerating or *** such a situation,it requires to use an objective *** represents a property that one variable is not observer-dependent(the observer’s motion can be either inertial or non-inertial).A strategy based on a zero-vorticity(measured in inertial frame)reference point is proposed in this letter to find the objective vortex *** is chosen as the vortex indicator and two numerical examples are used to test the proposed *** results show that the strategy is effective.
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