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ISSN オンライン: 2642-0554

AN EFFECT OF A WEAK COMPRESSIBILITY ON TUBULAR VORTICES IN DECAYING ISOTROPIC TURBULENCE

Hideaki Miura
Theory and Computer Simulation Center, National Institute for Fusion Science, Oroshi 322-6, Toki, Gifu 509-5292, Japan

要約

We investigate effects of a weak compressibility on turbulence by means of vortex identification. A vortex identification scheme developed by Miura and Kida (1997), and Kida and Miura(1998a) for an incompressible fluid is extended to compressible fluids, to analyze statistical nature of vortices in compressible turbulence. It is shown through this analysis that a weak compressibility makes total volume of vortex cores of compressible turbulence smaller than that of incompressible turbulence. Radius of vortices in compressible turbulence tends to be smaller and less uniform than their incompressible counter parts. Relations between our vortex analysis and previous investigations for compressible homogeneous turbulence and mixing layers are discussed.