Stochastic Forcing of the Batchelor Vortex
The dynamics of the high-Reynolds-number vortices with axial flow continuously forced by a random excitation is investigated. Large response is possible, especially for the helical modes (with azimuthal wavenumbers |n| = 1). The general trends are complicated by a number of issues, including a long-wavelength effect and a resonance effect, both of which were recently discovered for optimal perturbation and are found here to be present for stochastic forcing of swirling flow. Overall, the results suggest that strong response energy are present in the moderate- to highswirl regime of practical interest (swirl number q ≥ 2). For axisymmetric (n = 0) and higher azimuthal wavenumbers |n| > 1, the axial flow contributes little to the response energy.
random excitation stochastic forcing
Z. W. Guo C. Chen D. J. Sun
Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China
国际会议
广州
英文
302-304
2011-06-30（万方平台首次上网日期，不代表论文的发表时间）