Radiative energy transfer in compressible turbulence
نویسندگان
چکیده
This Letter investigates the compressible energy transfer process. We extend a methodology developed originally for incompressible turbulence and use databases from numerical simulations of a weak compressible turbulence based on Eddy-DampedQuasi-Normal-Markovian (EDQNM) closure. In order to analyze the compressible mode directly, the well known Helmholtz decomposition is used. While the compressible component has very little in uence on the solenoidal part, we found that almost all of compressible turbulence energy is received from its solenoidal counterpart. We focus on the most fundamental building block of the energy transfer process, the triadic interactions. This analysis leads us to conclude that, at low turbulent Mach number, the compressible energy transfer process is dominated by a local radiative transfer (absorption) in both inertial and energy containing ranges. The research was supported for the rst author by the French Government, Ministere des A aires Etrangeres. This research was partially supported by the National Aeronautics and Space Administration under NASA Contract No. NAS1-19480 while the rst and second authors were in residence at the Institute for Computer Applications in Science and Engineering (ICASE), NASA Langley Research Center, Hampton, VA 23681-0001.
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تاریخ انتشار 1997