Scale-Dependent Properties of Optimal Perturbations on a Zonally Varying Barotropic Flow

effect of sub-grid scales on large eddy simulation of particle deposition in a turbulent channel flow

چکیده ندارد.

Nonlinear optimal perturbations in a Couette flow: bursting and transition

A scale-dependent power asymmetry from isocurvature perturbations

If the hemispherical power asymmetry observed in the cosmic microwave background (CMB) on large angular scales is attributable to a superhorizon curvaton fluctuation, then the simplest model predicts that the primordial density fluctuations should be similarly asymmetric on all smaller scales. The distribution of high-redshift quasars was recently used to constrain the power asymmetry on scales...

Optimal inflow boundary condition perturbations in steady stenotic flow

We determine optimal inflow boundary perturbations to steady flow through a straight inflexible tube with a smooth axisymmetric stenosis at a bulk-flow Reynolds number Re = 400, for which the flow is asymptotically stable. The perturbations computed produce an optimal gain, i.e. kinetic energy in the domain at a given time horizon normalized by a measure of time-integrated energy on the inflow ...

Diffusive Limits for a Barotropic Model of Radiative Flow

Here we aim at justifying rigorously different types of physically relevant diffusive limits for radiative flows. For simplicity, we consider the barotropic situation, and adopt the so-called P1-approximation of the radiative transfer equation. In the critical functional framework, we establish the existence of global-in-time strong solutions corresponding to small enough data, and exhibit unif...