Investigation of rough-wall turbulence over barnacle roughness with increasing solidity using direct numerical simulations

Direct numerical simulations of capillary wave turbulence.

This work presents direct numerical simulations of capillary wave turbulence solving the full three-dimensional Navier-Stokes equations of a two-phase flow. When the interface is locally forced at large scales, a statistical stationary state appears after few forcing periods. Smaller wave scales are generated by nonlinear interactions, and the wave height spectrum is found to obey a power law i...

Direct Numerical Simulation of Wall Turbulence with Bubbles

Procedure to Validate Direct Numerical Simulations of Wall- Bounded Turbulence Including Finite-Rate Reactions

cp = specific heat at constant pressure, J= kg K cv = specific heat at constant volume, J= kg K E = total energy, J=m Ev = vibrational energy, J=m h = specific enthalpy, J=kg h = heat of formation, J=kg Keq = Equilibrium constant kB = Boltzmann’s constant, 1:381 10 23 J=K kb = backward reaction coefficient kf = forward reaction coefficient M = molecular weight, kg=mole NA = Avogadro’s number, 6...

Experiments and direct numerical simulations of two-dimensional turbulence.

Experiments and direct numerical simulations reveal the coexistence of two cascades in two-dimensional grid turbulence. Several features of this flow such as the energy density and the scalar spectra are found to be consistent with well known theoretical predictions. The energy transfer function displays the expected up-scale energy transfers. The vorticity correlation function is logarithmic a...

Direct numerical investigation of turbulence of capillary waves.

We consider the inertial range spectrum of capillary wave turbulence. Under the assumptions of weak turbulence, the theoretical surface elevation spectrum scales with wave number k as Iη∼k(α), where α=α0=-19/4, energy (density) flux P as P(1/2). The proportional factor C, known as the Kolmogorov constant, has a theoretical value of C=C0=9.85 (we show that this value holds only after a formulati...