In addition, through direct numerical simulation (DNS) and large eddy simulation (LES) examples, it is demonstrated that the newly defined vortex vector can fully describe the complex vertical structures of turbulence. It is a vector and could give a unique and accurate mathematical definition for fluid rotation or vortex. With these new revelations, a vortex is defined as a connected region where the vortex vector is not zero. Chaoqun Liu of the University of Texas at Arlington. any activity, situation, or way of life regarded as irresistibly engulfing. This can be understood as that the direction of the vortex vector is equivalent to the direction of the local fluid rotation axis, and the magnitude of vortex vector is the strength of the location fluid rotation. noun plural -texes or -tices (-tsiz) a whirling mass or rotary motion in a liquid, gas, flame, etc, such as the spiralling movement of water around a whirlpool. A new vector quantity, which is called the vortex vector in this paper, is defined to describe the local fluid rotation and it is the rotational part of the vorticity. The direction and the strength of local fluid rotation are examined by investigating the kinematics of the fluid element in two- and three-dimensional flows. In this paper, we introduce several new concepts, including local fluid rotation at a point and the direction of the local fluid rotation axis. Cited in the previous studies, a vortex cannot be fully described by vorticity, and vorticity should be further decomposed into a rotational and a non-rotational part to represent the rotation and the shear, respectively. ![]() In this absence of a rigorous mathematical definition, considerable confusion appears to exist in visualizing and understanding the coherent vortical structures in turbulence. It can also refer to a swimming pool accesory (that recreates a liquid. Although the vortex is ubiquitous in nature, its definition is somewhat ambiguous in the field of fluid dynamics. The term vortex is used to denote a whirlpool-like movement of a fluid or particles.
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