## Search

Now showing items 1-10 of 11

#### A simplified structure-based model using standard turbulence scale equations: computation of rotating wall-bounded flows

(2006)

Two linear eddy-viscosity models, the v2-f and k-ω models, have been combined with an algebraic structure-based algorithm for the evaluation of the Reynolds stresses. This closure was originally designed as an integral ...

#### Large Eddy Simulation of near-bed pipelines in oscillatory flow

(2018)

A series of unsteady, three-dimensional numerical simulations of the incompressible, oscillatory flow around a near-bed pipeline is presented. A flow at Reynolds number equal to Reαo=20,000 with respect to the oscillatory ...

#### Representing anisotropy of two-point second-order turbulence velocity correlations using structure tensors

(2008)

A locally homogeneous representation for the two-point, second-order turbulent velocity fluctuation Rij(x,r) = 〈u′i(x)u′i(x+r)〉 is formulated in terms of three linearly independent structure tensors [Kassinos et al., J. ...

#### The contribution of active and inactive structures to the statistics of a turbulent pipe flow

(2017)

The current study is a short follow-up to our most recent work (Stylianou et al., 2016), where among other things we have presented an effective criterion suitable for distinguishing large-scale coherent structures with ...

#### Magnetohydrodynamic turbulence at moderate magnetic Reynolds number

(2004)

We consider the case of homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field at low to moderate magnetic Reynolds numbers (by moderate we mean here values as high as 20). When ...

#### Dispersed-phase structural anisotropy in homogeneous magnetohydrodynamic turbulence at low magnetic Reynolds number

(2008)

A new tensor statistic, the dispersed-phase structure dimensionality Dp, is defined to describe the preferred orientation of clusters of discrete bodies. The evolution of Dp is calculated via direct numerical simulations ...

#### Structure and scales in turbulence modeling

(2002)

The enstrophy of the large-scale energy-containing turbulence is proposed as the second turbulence scale for use, in conjunction with the turbulence energy, in two-scale one-point engineering turbulence models. Its transport ...

#### Numerical simulations of turbulent flow in an eccentric annulus of unit eccentricity

(TSFP-9, 2015)

In this study, we perform Direct Numerical Simulations (DNS) of fully developed turbulent flows in eccentric annuli having different diameter ratios. Annuli of unit eccentricity, and diameter ratios of 0.2591 and 0.1395 ...

#### Statistical measures of structural anisotropy in MHD turbulence subjected to mean shear and frame rotation

(2006)

We consider homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field while being sheared in fixed and rotating frames. We take both the frame-rotation axis and the applied magnetic ...

#### The transport of a passive scalar in magnetohydrodynamic turbulence subjected to mean shear and frame rotation

(2007)

We consider the transport of a passive scalar under the influence of homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field while being sheared in fixed and rotating frames. The ...