Direct numerical simulation and analysis of shock turbulence interactionTwo kinds of linear analysis, rapid distortion theory (RDT) and linear interaction analysis (LIA), were used to investigate the effects of a shock wave on turbulence. Direct numerical simulations of two-dimensional isotropic turbulence interaction with a normal shock were also performed. The results from RDT and LIA are in good agreement for weak shock waves, where the effects of shock front curvature and shock front unsteadiness are not significant in producing vorticity. The linear analyses predict wavenumber-dependent amplification of the upstream one-dimensional energy spectrum, leading to turbulence scale length scale decrease through the interaction. Instantaneous vorticity fields show that vortical structures are enhanced while they are compressed in the shock normal direction. Entrophy amplfication through the shock wave compares favorably with the results of linear analyses.
Document ID
19910034719
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lee, Sangsan (Stanford Univ. CA, United States)
Lele, Sanjiva K. (Stanford University CA, United States)
Moin, Parviz (NASA Ames Research Center Moffett Field; Stanford University, CA, United States)