Quasi-DNS Dataset of a Piloted Flame with Inhomogeneous Inlet Conditions

Abstract

A quasi-DNS of the partially premixed turbulent Sydney flame in configuration FJ200-5GP-Lr75-57 has been conducted using detailed molecular diffusion for multi-component mixtures and complex reaction mechanisms. In order to study flame dynamics like regime transition in this flame for the development of new combustion models and to directly compare the quasi-DNS to different LES models, the simulation results are compiled into a data base. Because the simulation was performed with OpenFOAM, we demonstrate the quasi-DNS capabilities of OpenFOAM by performing canonical test cases. They attest that OpenFOAM’s cubic discretization has lower numerical diffusion compared to classical central difference schemes and can reach higher than second order convergence rate in some cases. The quasi-DNS of the Sydney flame is conducted with a self-developed reacting flow solver which is able to accurately compute molecular diffusion coefficients from kinetic gas theory and employs a fast implementation for detailed reaction mechanisms. The computational mesh is shown to be able to resolve the flow as well as the flame front sufficiently for the quasi-DNS. Comparisons with experimental data also show that the simulation can quantitatively reproduce measured time-mean and time-RMS statistics.

Implementation and Validation of a Computationally Efficient DNS Solver for Reacting Flows in OpenFOAM

“…OpenFOAM is used to solve the governing equations while Cantera is used to compute detailed transport properties. The details are given below and further information can be found in [4,5,6,7,8,9]. The solver has thus far been validated and used in a number of works [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27].…”

“…Figure 3 compares the profiles of selected species from the results of the optimized solver with a reference solution by Cantera for a methane/air flame. For more information about this setup, see [5].…”

“…It is therefore highly recommended to use OpenFOAM's cubic scheme for simulations with a need for high accuracy. For more information about the Taylor-Green case, see [5].…”

“…Spatial gradients are discretized with OpenFOAM's fourth order interpolation scheme cubic and for the temporal discretization, a second order implicit Euler method is used. For more details about the setup, see [5,14,10].…”

Numerical Study of Quenching Distances for Side-Wall Quenching Using Detailed Diffusion and Chemistry

“…Our in-house solver (Zirwes et al 2019b implemented in the open-source CFD framework OpenFOAM (Weller et al 2017) in version v1712 is used for the simulations of the SWQ and HOQ in the following sections. It is coupled to the open-source library Cantera (Goodwin et al 2017) in version 2.5.0a2 in order to compute detailed molecular diffusion coefficients from either the multi-component or mixture-averaged model (Kee et al 2005) and to utilize finite rate chemistry from detailed reaction mechanisms.…”