The Influence of a Local Swirl Ratio on Tornado Intensification near the Surface

By D. Lewellen, W. S. Lewellen, J. Xia. 2000

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The Three-Dimensional Structure and Evolution of a Tornado Boundary Layer (2013, background): “Numerical simulations (e.g., Lewellen et al. 1997; Lewellen et al. 2000, hereafter L00; Lewellen and Lewellen 2007, hereafter LL07) and laboratory models (e.g., Church et al. 1979) of tornadoes have been instrumental in understanding the TBL, but these results remain largely unveriﬁed…”
The Fluid Dynamics of Tornadoes (2013, methodology): “In an attempt to identify the physical variables in the near-corner-flow environment that determine the corner flow, Lewellen et al. (2000) defined the “corner-flow swirl ratio” Sc = rc 2∞/ϒ, (25) www.annualreviews.org • The Fluid Dynamics of Tornadoes 79 A nn u.”
A review of supercell and tornado dynamics (2015, unknown): “Corner flow collapse (Lewellen et al., 2000) and downward transport of vertical vorticity to theground where there is nonepreviously (Davies-Jones, 1982a,b) are two sides of the same coin.”