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Erschienen in:
01.08.2013 | Regular Paper
Visualization of large-scale structures in spatially developing compressible mixing layers
Erschienen in: Journal of Visualization | Ausgabe 3/2013
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Abstract
Large-scale structures in two- and three-dimensional, spatially developing, compressible mixing layers are visualized. The convective Mach number Mc is prescribed to be 0.4 and 0.8. Direct numerical simulations were performed using a Discontinuous Galerkin method. Special attention is paid on the panorama of spatial evolution of large-scale structures, as well as on the compressibility effect on these structures. Fine structures such as the sonic waves at the inlet, and shocklet structures for the Mc = 0.8 case are also visualized. For the three-dimensional cases, in order to show the spatial evolution of the large-scale structures more clearly, both the \( \lambda_{2} \) and Q
2 structure extraction methods colored with stream-wise velocity magnitude are utilized. The “H-type” secondary instability structure and the “forest” structures are evident. It is found that the \( \lambda_{2} \) method gives better results in the case of high compressibility effect shear flows.
Graphical Abstract
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