이산 vortex에 의하여 simulate된 vortex shedding과 유동 가속으로 인하여 원주에 작용되는 양력과 항력 계산식

Abstract

원주에서의 vortex 유출에 대한 이산화 vortex 해석을 할 때 사용할 수 있도록 원주에 작용되는 양력과 항력 계산식을 유도하였다. 이 식들은 유출된 vortex에 관련된 인수들로 나타내졌으며 확장된 Blasius 정리를 조작하여 구하여졌다. 원주 중심에 vortex가 있다고 보는가 없다고 보는가의 두가지 가능한 Image system을 동시에 다루었다. 어느 경우건 현재까지 주목되지 않은 초생 vortex성장율을 포함하는 새로운 향이 이 계산색에 나타남을 보였다.

Formulas to calculate drag and lift exerted to a circular cylinder are derived for use in connection with the discrete vortex analysis of vortex shedding from the cylinder. The formulas are expressed in terms of the parameters concerned with the vortices and are obtained by manipulating the extended Blasius theorem. Two possibilities of the image system for a vortex outside the cylinder are covered simultaneously, the difference between these being whether the image system possesses a vortex at the center of the cylinder or not. In either case, the formulas are shown to have a new term containing the growth rates of the so-called nasecnt vortices which has not been noticed so far.

Formulas to calculate drag and lift exerted to a circular cylinder are derived for use in connection with the discrete vortex analysis of vortex shedding from the cylinder. The formulas are expressed in terms of the parameters concerned with the vortices and are obtained by manipulating the extended Blasius theorem. Two possibilities of the image system for a vortex outside the cylinder are covered simultaneously, the difference between these being whether the image system possesses a vortex at the center of the cylinder or not. In either case, the formulas are shown to have a new term containing the growth rates of the so-called nasecnt vortices which has not been noticed so far.