Browsing by Subject "turbulence"
Now showing items 110 of 10

Assessment of turbulence model performance: Large streamline curvature and integral length scales
(Elsevier, 20151210)For the flow over curved surfaces, an extra wallnormal pressure gradient is imposed to the flow through excessive surface pressure, such that the flow turns in alignment with the surface. In turn, turbulent fluctuations ... 
Assessment of turbulence model performance: Severe acceleration with large integral length scales
(Elsevier, 20151217)Turbulence is substantially laminarised, when the mean flow experiences streamwise acceleration above a certain critical acceleration parameter. Recently, to essentially reveal aero engine intake acceleration scenarios, ... 
Development and validation of a combustion model for a fuel cell offgas burner
(20081014)A lowemissions power generator comprising a solid oxide fuel cell coupled to a gas turbine has been developed by RollsRoyce Fuel Cell Systems. As part of the cycle, a fraction of the unreacted fuel (the offgas) and ... 
An experimental study of turbulent vortex rings using particle image velocimetry
(20101012)In this dissertation, the early development of turbulent vortex rings at two Reynolds numbers is studied using twodimensional and Stereoscopic Particle Image Velocimetry. In the late 1980s’ a similarity theory of turbulent ... 
Fibre behaviour in the spunbonding process. Part I: Characterisation of air flow and fibre motion
(Sage, 20151110)The random fibre oscillatory behaviour induced by turbulence in the diffuser of an industrial spunbonding rig is measured experimentally. The turbulent air flow is firstly characterised by constant temperature hotwire ... 
Fibre behaviour in the spunbonding process. Part II: Modelling fibre dynamics in turbulent flows
(Sage, 20151110)The behaviour of a fibre subject to the turbulent air flow in the diffuser in the spunbonding process is studied using a threedimensional dynamics model in which the fibre is discretised as a chain of beads connected by ... 
The Frequency Response of Acoustic Doppler Current Profilers : Spatiotemporal response and implications for tidal turbine site assessment
(2014)The lifespan of a tidal turbine is strongly affected by the unsteady loading it experiences, so knowledge of the mean flow speed is not sufficient: unsteadiness must also be quantified. One of the most common turbulence ... 
Large eddy simulation of premixed combustion using flamelets
(20160202)Large Eddy Simulation (LES) has potential to address unsteady phenomena in turbulent premixed flames and to capture turbulence scales and their influence on combustion. Thus, this approach is gaining interest in industry ... 
On the convective overstability in protoplanetary discs
(Oxford University Press, 20160121)This paper explores the driving of lowlevel hydrodynamical activity in protoplanetarydisc dead zones. A small adverse radial entropy gradient, ordinarily stabilized by rotation, excites oscillatory convection (‘convective ... 
The stress–pressure relationship in simulations of MRIinduced turbulence
(Oxford University Press, 20160101)We determine how MRI (magnetorotational instability)turbulent stresses depend on gas pressure via a suite of unstratified shearing box simulations. Earlier numerical work reported only a very weak dependence at best, ...