Abstract:
A numerical analysis of the internal flows is performed to im-
prove the current understanding and modelling capabilities of
the complex flow characteristics encountered in energy systems.
Simulation is divided into two stages, micro- and macro-scales.
The averaged Navier–Stokes equations are solved numerically
for the gas phase. The particulate phase is simulated through a
Lagrangian deterministic and stochastic tracking models to pro-
vide particle trajectories. The particles are assumed to interact
with a succession of turbulence eddies, as they move through the
computational domain. The results obtained highlight the cru-
cial significance of the particle dispersion in turbulent flow and
high potential of statistical methods. Strong coupling between
acoustic oscillations, vortical motion, turbulent fluctuations and
particle dynamics is observed. Acoustic oscillations provide ad-
ditional mechanism to transfer energy from periodic motions to
turbulence leading to an enhanced level of turbulence intensity.
Acoustic waves give rise to an early transition from laminar to
turbulent flow through energy transfer from the organized oscil-
latory field to the broadband turbulent flowfield.
Description:
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
