Application of Pareto-efficient combustion modeling framework to large eddy simulations of turbulent reacting flows

Abstract

1 arXiv:1712.00966v1 [physics.flu-dyn] 4 Dec 2017 model through local sub-model assignment of the finite-rate chemistry (FRC) model. To this end, a series of LES-PEC calculations are performed on a piloted partially-premixed dimethyl ether flame (DME-D), using a combination of FPV and FRC models. The drift term is utilized in the PEC framework to the estimate the model related error for quantities of interest. The PEC approach is demonstrated to be capable of significantly improving the prediction of CO emissions compared with the monolithic FPV simulation. The improved accuracy is achieved by enriching the FPV model with FRC in regions where the lower-order model is determined insufficient through the evaluation of drift terms.

A General Predictive Methodology for Fuel-Mixture Properties Up to Supercritical Conditions

“…C-1 is an alcohol-to-jet (ATJ) fuel containing highly branched dodecane and hexadecane type components, crafted by the National Jet Fuels Combustion Program NJFCP [73]. The C-1 ATJ fuel was designed to represent alternative jet fuels in experimental procedures, with the goal of developing non-fossil-based jet fuel alternatives [74]. These non-conventional fuels can be a potential solution to limiting the impact of anthropogenic carbon from the aviation transportation sector [74].…”

“…The C-1 ATJ fuel was designed to represent alternative jet fuels in experimental procedures, with the goal of developing non-fossil-based jet fuel alternatives [74]. These non-conventional fuels can be a potential solution to limiting the impact of anthropogenic carbon from the aviation transportation sector [74].…”

Adaptive Krylov-Type Time Integration Methods

“…Since the coefficient matrices β and γ are lower triangular, the matrices β ⊗ h J, γ ⊗ hJ, as well as h A γ are all block lower triangular. The i-th stage component vector in (18) has the form:…”

“…For this reason, among others, we focus our attention on an alternative formulation of (2) called Rosenbrock-Krylov [14] or exponential-Krylov [13] methods, in which the coefficients are chosen to permit a specific, Krylov-based, approximation A n of the Jacobian matrix J n . These methods have been shown to be at least efficient for a broad spectrum of problems through comparisons of relative performance against an assortment of standard integrators [6,[12][13][14]16], and have been effectively used to study engineering problems in [5,11,17,18].…”

Efficient time stepping for reactive turbulent simulations with stiff chemistry

“…The Strang splitting method is strongly stable and second-order accurate in time. By splitting the reaction operator from the advectiondiffusion operator, different time integration methods can be applied, which can be chosen to be a better fit for the corresponding operator [40].…”