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Fluids 2017, 2(4), 68;

Axisymmetric Tornado Simulations with a Semi-Slip Boundary

School of Meteorology, University of Oklahoma, 120 David L. Boren Blvd. Suite 5900, Norman, OK 73072-7307, USA
Received: 2 November 2017 / Revised: 28 November 2017 / Accepted: 8 December 2017 / Published: 11 December 2017
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The structure of natural tornadoes and simulated analogs are sensitive to the lower boundary condition for friction. Three-dimensional numerical simulations of storms require a choice for turbulence parameterizations and resolution of wind near the lower boundary. This article explores some of the consequences of choices of a surface drag coefficient on the structure of a mature simulated tornado, using a conventional axisymmetric model. The surface drag parameterization is explored over the range of the semi-slip condition, including the extremes of no-slip and free-slip. A moderate semi-slip condition allows for an extreme pressure deficit, but without the unrealistic vortex breakdown of the no-slip condition. View Full-Text
Keywords: tornadoes; vortex dynamics; axisymmetric model tornadoes; vortex dynamics; axisymmetric model

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Fiedler, B.H. Axisymmetric Tornado Simulations with a Semi-Slip Boundary. Fluids 2017, 2, 68.

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