Mode intermittence in a wake from two cylinders

[摘要] Near turbulent intermittent wake from a set contained of two cylinders is investigated in the case of moderate Reynolds number when distinguished wake global modes are competing. This study is performed within the framework of the reduced-order oscillator model where each von Karman vortex street behind a cylinder is modeled by an oscillator of van der Pole type. First distinguished feature of the model is using a nonlinear form in model equations for treating of these streets interaction. The second feature is that the oscillator equations are generalized for explicit dependence of the oscillation frequency on oscillation amplitude. Dependence of the global modes frequencies of oscillation on the model parameters is adduced. An example of attraction domain for an asymmetric wake global mode is studied.

[发布机构] A. Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, Moscow, Russia^1;Moscow Aviation Institute (National Research University), Moscow, Russia^2;National Research Univercity Moscow State University of Civil Engineering (NRU MGSU), Moscow, Russia^3

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Attraction domain;Explicit dependences;Model parameters;Moderate Reynolds numbers;Oscillation amplitude;Oscillation frequency;Oscillator equations;Von Karman Vortex Street