Modelling of a wake from cylinders row

Model of intermittent near wake from a row of parallel cylinders is constructing. The aim of the investigation includes besides neutral wakes modelling the interpretation and "physical modelling" of the glow-discharge switching effect on a cylinders wake discovered by us earlier. The form of this reduced-order model of multiple wake is nonlinear-interacting von Karman streets each resulting from one cylinder of the row and each represented by one-dimensional oscillator. Here the correlation between known Landau-Stuart, Van der Pole wake models and ours is considered. Various global modes of such multiple wake are discovered within the framework of the model. Among them a two-frequency asymmetric global mode of the wake was discovered in accordance with well-known observations for relatively close cylinders arrangements. For each global mode an analytical approximation or exact expression for the wake configuration is presented that may be useful in further analysis. Matching of these approximations with the results of numerical computing within the framework of the model is considered.