Abstract
Scalar mixing in isotropic turbulence with Schmidt numbers ranging from 0.04 up to 144 is studied by numerical simulation. The scalar spectra show a k −1 range for Sc>1. Also for Sc <1 the spectra appear to have a short k −1 range. The scalar dissipation spectra are universally self-similar under Batchelor scaling. The form of the dissipation spectra agrees well with the Kraichnan model. The scalar gradient aligns with the direction of the compressive strain both for Sc<1 and for Sc>1. The local fine-scale structure of the velocity field appears to have an effect on the scalar mixing process for all Schmidt numbers.
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Brethouwer, G., Nieuwstadt, F.T.M. (1999). Mixing of Weakly and Strongly Diffusive Passive Scalars in Isotropic Turbulence. In: Voke, P.R., Sandham, N.D., Kleiser, L. (eds) Direct and Large-Eddy Simulation III. ERCOFTAC Series, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9285-7_26
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DOI: https://doi.org/10.1007/978-94-015-9285-7_26
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