The effects of an external electric field on a turbulent methane/air diffusion flame are analyzed in this work using direct numerical simulations. configuration consists temporally evolving mixing layer air and mixture methane nitrogen at 1 atm that is impinged by the direction normal to mean plane. combustion chemi-ionization reactions involved flow modeled finite-rate chemistry reduced reacti...

An a priori analysis of subfilter-scale (SFS) species structure important to estimate chemical reaction rates in large-eddy simulation (LES) is performed using direct numerical (DNS) turbulent premixed flame at turbulence Reynolds number Re0=329 and Karlovitz Ka0=7.23 with semi-detailed finite-rate chemistry. Differences between the complete extracted from DNS those estimated LES-filtered varia...

in this paper, direct numerical simulation of two-phase incompressible gas-liquid flow for simulation of bubble motion in a microtube is presented. microtube radius is 10 µm. the interface is tracked using volume of fluid (vof) method with continuous surface force (csf) model. the flow is solved using a finite volume scheme, based on piso algorithm. numerical simulation is performed on a axisym...

A computational study has been conducted to determine the critical conditions for the transition from localized flame ignition and propagation to the establishment of a flame ball. Lean H2/air mixtures are investigated using a time-dependent, spherically symmetric code with detailed chemistry, transport, and radiation submodels. Results show that outwardly propagating spherical flames can be ig...

Steady premixed flames subjected to space-periodic steady forcing are studied via inhomogeneous Michelson-Sivashinsky (MS) and then Burgers equations. For both, the flame slope is posited to comprise contributions from complex poles to locate, and from a base-slope profile chosen in three classes (pairs of cotangents, single-sine functions or sums thereof). Base-slope-dependent equations for th...