ALE 모델의 래티스볼츠만 스킴에의 적용

An Application of ALE Model to Lattice Boltzmann Scheme - Analysis of F1ow-induced Noise Generated from Rotating Elliptic Cylinder -

Numerical solutions are presented for compressible fluid flow past a rotating elliptic cylinder in a medium at rest at infinity. Flowfields and acoustic waves emitted from rotating elliptic cylinder are directly simulated by the lattice Boltzmann method formulated by the arbitrary Lagrangian Eulerian scheme. The flowfield is almost periodic after the calculation fully developed and studied by means of streamlines and equi-vorticity lines and by means of drag, lift and moment coefficients. The numerical analysis produce typical flows such that the large vortexes appear at the outside of the elliptic cylinder, and move slowly to the same direction as the cylinder’s rotation. The positive and negative vorticity is alternately occurred at the edge by those large vortexes. The acoustic waves propagate synchronizing with the rotation and increase with M3.5 of rotational speed of elliptic cylinder.