When discussing research in physics and in science more generally, it is common to ascribe
equal importance to the three components of the scientific trinity: theoretical, experimental …

In flows, material does not vanish, nor does new material appear. The velocity fields
therefore have to satisfy conservation of mass. This law is easiest to formulate for steady …

From a database of direct numerical simulations of homogeneous and isotropic turbulence,
generated in periodic boxes of various sizes, we extract the spherically symmetric part of …

The turbulence problem at the level of scaling exponents is hard in part because of the
multifractal scaling of small scales, which demands that each moment order be treated and …

A brief report is given of a new 2048 3 direct numerical simulation of the mixing of passive
scalars with uniform mean gradients in forced, stationary isotropic turbulence. The Taylor …

It is now well established that quantities such as energy dissipation, scalar dissipation and
enstrophy possess huge fluctuations in turbulent flows, and that the fluctuations become …

We present an overview of the current status in the development of a two-point spectral
closure model for turbulent flows, known as the local wavenumber (LWN) model. The model …

Turbulent shear flows, such as those occurring in the wall region of turbulent boundary
layers, show a substantial increase of intermittency in comparison with isotropic conditions …

One of the main benchmarks in direct numerical simulations of three-dimensional turbulence
is the Kolmogorov prediction for third-order structure functions with homogeneous and …

It is now believed that the scaling exponents of moments of velocity increments are
anomalous, or that the departures from Kolmogorov's (1941) self-similar scaling increase …