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Vorticity and mixing in Rayleigh–Taylor Boussinesq turbulence

Published online by Cambridge University Press:  03 August 2016

Nicolas Schneider  and
Serge Gauthier
Nicolas Schneider
Affiliation:
CEA, DAM, DIF, Bruyères-Le-Châtel, 91297 Arpajon, EU, France
Serge Gauthier*
Affiliation:
CEA, DAM, DIF, Bruyères-Le-Châtel, 91297 Arpajon, EU, France
*
†Email addresses for correspondence: [email protected], [email protected]
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Abstract

The Rayleigh–Taylor instability induced turbulence is studied under the Boussinesq approximation focusing on vorticity and mixing. A direct numerical simulation has been carried out with an auto-adaptive multidomain Chebyshev–Fourier–Fourier numerical method. The spatial resolution is increased up to $(24\times 40)\times 940^{2}=848\,M$ collocation points. The Taylor Reynolds number is $\mathit{Re}_{\unicode[STIX]{x1D706}_{zz}}\approx 142$ and a short inertial range is observed. The nonlinear growth rate of the turbulent mixing layer is found to be close to $\unicode[STIX]{x1D6FC}_{b}=0.021$ . Our conclusions may be summarized as follows.

(i) The simulation data are in agreement with the scalings for the pressure ( $k^{-7/3}$ ) and the vertical mass flux ( $k^{-7/3}$ ).

(ii) Mean quantities have a self-similar behaviour, but some inhomogeneity is still present. For higher-order quantities the self-similar regime is not fully achieved.

(iii) In the self-similar regime, the mean dissipation rate and the enstrophy behave as $\langle \overline{\unicode[STIX]{x1D700}}\rangle \propto t$ and $\langle \overline{\unicode[STIX]{x1D714}_{i}\,\unicode[STIX]{x1D714}_{i}}^{1/2}\rangle \propto t^{1/2}$ , respectively.

(iv) The large-scale velocity fluctuation probability density function (PDF) is Gaussian, while vorticity and dissipation PDFs show large departures from Gaussianity.

(v) The pressure PDF exhibits strong departures from Gaussianity and is skewed. This is related to vortex coherent structures.

(vi) The intermediate scales of the mixing are isotropic, while small scales remain anisotropic. This leaves open the possibility of a small-scale buoyancy. Velocity intermediate scales are also isotropic, while small scales remain anisotropic. Mixing and dynamics are therefore consistent.

(vii) Properties and behaviours of vorticity and enstrophy are detailed. In particular, equations for these quantities are written down under the Boussinesq approximation.

(viii) The concentration PDF is quasi-Gaussian. The vertical concentration gradient is both non-Gaussian and strongly skewed.

JFM classification

Turbulent Flows: Intermittency Turbulent Flows: Turbulence simulation Mixing: Turbulent mixing
Type
Papers
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Journal of Fluid Mechanics , Volume 802 , 10 September 2016 , pp. 395 - 436
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© 2016 Cambridge University Press 

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