내부자유도를 갖는 차분래티스볼츠만 모델에 의한 에지톤의 수치계산
Numerical Simulation of Edge Tone by Finite Difference Lattice Boltzmann Model with Internal Degree of Freedom
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Abstract
A lattice BGK model based on a finite difference scheme with an internal degree of freedom is employed and it is shown that a diatomic gas such as air is successfully simulated. In a weak compressive wave problem and Coutte flow, the validity and characteristics of the applied model are examined. With the model, furthermore, we present a 2-dimensional edge tones to predict the frequency characteristics of discrete oscillations of a jet-edge feedback cycle by the FDLB model (I.D.F FDLBM) in which any specific heat ratio can be chosen freely. The jet is chosen long enough in order to guaranteed the parabolic velocity profile of a jet at the outlet, and the edges have of an angle of and . A sinuous instability wave with real frequency resulting from periodic oscillation of the jet around the edge is propagated on the upper and lower of wedge.
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