Letter: Modified normalized Rortex/vortex identification method
Abstract
In this paper, a modified normalized Rortex/vortex identification method named OmegaR is presented to improve the original OmegaR method and cure the bulging phenomenon on the iso-surfaces caused by the original OmegaR method. Detailed mathematical explanations and the relationship with the Q criterion are described. In addition, the new developed formula does not require two original coordinate rotations, and the calculation is greatly simplified. The numerical results are demonstrated to show the effectiveness of the new modified normalized Rortex/vortex identification method.
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