The weak version of universality in turbulence refers to the independence of the scaling exponents of the nth order structure functions from the statistics of the forcing. The strong version includes universality of the coefficients of the structure functions in the isotropic sector, once normalized by the mean energy flux. We demonstrate that shell models of turbulence exhibit strong universal...

We propose a consistent lattice Boltzmann equation (LBE) with baroclinic coupling between species and mixture dynamics to model the active scalar dynamics in multi-species mixtures. The proposed LBE model is directly derived from the linearized Boltzmann equations for mixtures and it has the following two distinctive features. First, it uses the multiple-relaxation-time collision model so that ...

We propose a consistent lattice Boltzmann equation (LBE) with baroclinic coupling between species and mixture dynamics to model the active scalar dynamics in multi-species mixtures. The proposed LBE model is directly derived from the linearized Boltzmann equations for mixtures and it has the following two distinctive features. First, it uses the multiple-relaxation-time collision model so that ...

Decaying homogeneous isotropic turbulence in inertial and rotating reference frames is investigated to evaluate the capability of the lattice Boltzmann method in turbulence. In the inertial frame case, the decay exponents of kinetic energy and dissipation and the low wave-number scaling of the spectrum are studied. The results are in agreement with classical ones. In the frame-rotation case, si...

Velocity autocorrelations and the mean-square displacements of fluid particles are obtained for decaying, isotropic homogeneous turbulence by numerical simulation of the flow field, using 1283 and 256’ grids, and tracking several tens of thousands of fluid particles, using a third-order interpolation scheme. A self-preserving Lagrangian velocity autocorrelation coefficient is found in terms of ...

The performance of a subgrid stress SGS model for large eddy simulation LES developed by Misra Pullin is studied for forced and decaying isotropic turbulence on a grid The physical viability of the model assumptions are tested using DNS databases The results from LES of forced turbulence at Tay lor Reynolds number R are compared with ltered DNS elds Probability density functions pdfs of the sub...

The Taylor-Reynolds and Reynolds number (Reλ and Re) dependence of the dimensionless energy dissipation rate cǫ = ǫL/u 3 1,rms is derived for statistically stationary isotropic turbulence, employing the results of a variable range mean field theory. Here, ǫ is the energy dissipation rate, L is the (fixed) outer length scale, and u1,rms a rms velocity component. Our fit-parameter free results fo...