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The topology of homogeneous isotropic turbulence with passive scalar transport. (English) Zbl 1116.76365

Summary: Data obtained from direct numerical simulations of isotropic homogeneous turbulence and the diffusion of a scalar with an applied mean gradient is analysed using the topological techniques developed by M. S. Chong, A. E. Perry and B. J. Cantwell [A general classification of three-dimensional flow fields. Phys. Fluids A 2, No. 5, 765–777 (1990)] Simulations were run at two different Taylor-Reynolds numbers and two different Schmidt numbers. Comparing the numerical results obtained, relationships between the scalar characteristics and the topological features of the flow are identified.

MSC:

76F25 Turbulent transport, mixing
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