Spreading of Nonuniform Jets in Wind

Abstract

The steady flow due to a nonuniform source in an otherwise uniform stream is studied, the source taking the form of an upstream-pointing and a downstream-pointing slender jet, or sheet-jet. The planar-model setting is described, along with applications, and then viscous flow computations are presented. The results show that the sheet-jet source together with the entrainment into the jets upstream and downstream induce an almost sink-like response in the overall flow, in contrast with the effects of a uniform source. The response yields a small eddy at the higher Reynolds numbers of the computations and suggests that large-scale eddies may occur for increased Reynolds numbers; yet the uniform-source model predicts the upstream stagnation point and some other features well.