Doubly conditional moment closure modelling for HCCI with temperature inhomogeneities

Conditional Moment Closure Modelling of Turbulent Spray Flames

Modelling transonic flows with second-moment closure

It is now generally accepted that statistical turbulence models are unlikely, ever, to enable highfidelity predictions of massively-separated flows, especially if separation occurs from curved three-dimensional surfaces. In such circumstances, even the most elaborate turbulence models are ill-equipped to capture the dynamics associated with highly-unsteady and intense large-scale motions that a...

Conditional Moment Closure Modelling for Spark Ignition in a Turbulent N-heptane Spray

Ignition and flame stabilisation have been simulated in a turbulent, bluff body stabilised spray flame. A complete first order Conditional Moment Closure (CMC) model for spray combustion is presented, as well as CMC modelling for spark ignition. The new elements of the two phase model formalism and the spark ignition models are illustrated using a one dimensional spray ignition example. It is s...

On relation of the Conditional Moment Closure and unsteady Flamelets

We consider the relation of the Conditional Moment Closure (CMC) and the unsteady Flamelet Model (FM). The CMC equations were originally constructed as global equations while FM was asymptotically derived for a thin reaction zone. The recent tendency is to use FM-type equations as global equations. We investigate the possible consequences and suggest a new version of FM – Coordinate-Invariant F...

Flamelet-based modeling of auto-ignition with thermal inhomogeneities for application to HCCI engines

Homogeneous-charge compression ignition (HCCI) engines have been shown to have higher thermal efficiencies and lower NOx and soot emissions than spark ignition engines. However, HCCI engines experience very large heat release rates which can cause too rapid an increase in pressure. One method of reducing the maximum heat release rate is to introduce thermal inhomogeneities, thereby spreading th...