Three-dimensional, rotational flamelet closure model with two-way coupling

A new flamelet model is developed to be used for subgrid modelling and coupled with the resolved flow description turbulent combustion. The differs from current models in several critical ways. (i) Non-premixed flames, premixed flames or multi-branched flame structures are determined rather than prescribed. (ii) effects of shear strain vorticity on determined. (iii) rates applied at level directly resolved-scale without use a contrived progress variable. (iv) three-dimensional need assuming axisymmetry planar geometry. (v) effect variable density addressed model. Solutions Navier–Stokes equations associated scalar governing obtained boundary-layer approximation. By appropriate coordinate transformation, similar solution found rotational model, reducing it system ordinary differential equations. Vorticity shown create centrifugal force counterflow that modifies molecular transport burning rate. Sample computations coupling presented first demonstrate importance features Scaling laws relating those quantities resolved-flow large-eddy simulations time-averaged mean-flow Reynolds-averaged flows. behaviour simple Specifically, two-dimensional, multicomponent, layer energy release employed using mixing-length eddy viscosity. Needs future study identified.