In this paper, the vorticity dynamics of a transverse jet at Re jet = 1715 and r = 7 is analyzed by the use of a computational model based on vortex element methods. This study extends our previous computational studies of inviscid transverse jets.9-11 The diffusion of the vorticity field is treated by a modified interpolation kernel, developed from the concept of the vorticity redistribution.14 The results of computation show the essential behavior of the viscous transverse jet, including the rollup of the jet shear layer and the formation of the counter-rotating vortex pair. The mechanism behind the formation of the counter-rotating vortex pair is also investigated by tracking the material line elements introduced as rings at the jet nozzle exit. The underlying mechanism of the formation of counter-rotating vortex pair shows similarity to the mechanism observed in our previous inviscid simulations,10,11 which confirms the robustness of the mechanism proposed. The jet trajectory is obtained by computing the averaged centerline streamline, and is compared to the scaling laws.3 The streamline does not agree to the near-field scaling law, but the far-field scaling law still shows validity, since the 1/3 power law has been recovered for the later stage of the jet.
|Number of pages||14|
|State||Published - 2005|
|Event||43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States|
Duration: 10 Jan 2005 → 13 Jan 2005
|Conference||43rd AIAA Aerospace Sciences Meeting and Exhibit|
|Period||10/01/05 → 13/01/05|