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- W2887592805 abstract "Implementing multicomponent diffusion models in numerical combustion studies is computationally expensive due to the challenges involved in computing diffusion coefficients. As a result, mixture-averaged diffusion treatments are used to avoid these costs. However, to the authors' knowledge, the accuracy and appropriateness of the mixture-averaged diffusion models has not been verified for 3D turbulent premixed flames. This study will evaluate the role of multicomponent mass diffusion in premixed, high-Karlovitz hydrogen flames, neglecting secondary Soret and Dufour effects. Direct numerical simulation (DNS) of these flames is performed by implementing the Stefan-Maxwell equations in NGA. A semi-implicit algorithm decreases computational expense of inverting the full multicomponent ordinary diffusion array while maintaining accuracy and fidelity. The algorithm is unconditionally stable provided the components of the mixture-averaged and multicomponent diffusion coefficient matrices are of order one over the number of species or smaller, and performance scales approximately with the number of species squared. 1D simulations of premixed hydrogen flames are performed and compared with matching cases in Cantera to verify this method. Premixed 2D, unstable and 3D, turbulent hydrogen flames are simulated and compared with previous mixture-averaged DNS results. Simulation conditions are carefully selected to match previously published results and ensure valid comparison. A priori analysis shows similar relative angles between the species diffusion flux vectors and species gradient vectors between mixture-averaged and multicomponent results. Further, a posteriori analysis demonstrates negligible differences in conditional means of the fuel mass fraction and its diffusion source term against temperature for mixture-average and multicomponent transport, respectively, between the two cases." @default.
- W2887592805 created "2018-08-22" @default.
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- W2887592805 date "2018-07-19" @default.
- W2887592805 modified "2023-09-27" @default.
- W2887592805 title "Assessing the importance of multicomponent transport properties in direct numerical simulations of premixed, turbulent flames using an efficient, dynamic memory algorithm" @default.
- W2887592805 hasPublicationYear "2018" @default.
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