Abstract
In the present study, the Reynolds effects on the flow fields of tornadoes in the range from 1.6 × 103 to 1.6 × 106 are systematically investigated. Large eddy simulations are adopted. Representative parameters including instantaneous Q value, mean velocities, root mean square of velocity fluctuations, skewness and kurtosis of the velocities, as well as the momentum budget is systematically investigated. It is noteworthy that if Re is sufficiently high, the major balance in the momentum budget between the radial pressure gradient and the centrifugal force even will be reached even at the elevation close to the ground. Furthermore, the ratio between the height and the radius of the location where the tangential velocity is peaked exhibit an almost linear relationship with Re−1/3, of which the slope decreases with the rise in the swirl ratio.
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