Bluff-body stabilized turbulent premixed flames represent a challenging canonical configuration for computational simulation and validation. Past simulation results from many research groups on the same bluff-body flame test case demonstrate significant variation that is neither fully understood nor quantified. To identify potential sources of this variation, three categories of sensitivities are assessed for a stable combustion bluff-body flame test case: exit boundary conditions, turbulent combustion closure models, and grid resolution. Comparisons with experimental data are presented, and an analysis of the causes of the discrepancies is informed by the sensitivity analysis. Specifically, low grid sensitivities at the finest resolution indicate that notable discrepancies with the experiment are likely due to model or boundary condition errors. All three categories of sensitivities are identified as significant, and the dominant source of variation in the results depends on the resolution and flow variable of interest. In spite of a lack of thermoacoustic oscillations, exit boundary condition effects are shown to be substantial, and errors in velocity statistics are minimized by extending the computational domain into the exhaust region.
Sensitivity Analysis of Bluff-Body Stabilized Premixed Flame Large-Eddy Simulations
Journal of Propulsion and Power ; 37 , 2 ; 211-222
2020-09-28
12 pages
Article (Journal)
Electronic Resource
English