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APPLICATION OF AN IMMERSED BOUNDARY METHOD FOR THREE-DIMENSIONAL FLOQUET STABILITY ANALYSIS  

Yoon, D.H. (인하대학교 대학원 기계공학과)
Yang, K.S. (인하대학교 기계공학부)
Publication Information
Journal of computational fluids engineering / v.14, no.4, 2009 , pp. 41-47 More about this Journal
Abstract
An immersed boundary method(IBM, Kim et al.(2001)) for simulating flows over complex geometries is applied to computation of three-dimensional Floquet stability of a periodic wake. Floquet stability analysis is employed to extract different modes of three-dimensional instability. To verify the present method, a fully-resolved Floquet stability calculation for flow past a circular cylinder is considered. There are two different instability modes with long(mode A) and short (mode B) spanwise wavelengths for the periodic wake of a circular cylinder. The critical Reynolds number and the most unstable spanwise wavelengths of modes A and B are computed using the present method, and compared with other authors' results currently available.
Keywords
Immersed Boundary Method; Floquet (Floquet Stability); Vortex Shedding;
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