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- W2938389218 abstract "In this work, tools are developed for different applications of Lagrangian particle methods in large eddy simulation (LES) and direct numerical simulation (DNS), to represent solid fuel particles, and notional gas phase particles in the Lagrangian transported filtered density function (FDF) method.In the first part of this work, the computational framework for pulverized coal combustion LES relying on Lagrangian particles is extended by the incorporation of a multi-dimensional flamelet model for gas phase combustion and different devolatilization models. The multidimensional flamelet model is parameterized by two mixture fractions for volatiles and char off-gases, enthalpy and scalar dissipation rate. The framework and modeling is adapted to a semi-industrial scale coal furnace and a laboratory coal jet flame to validate the simulation approach in a realistic case and to study devolatilization models in detail. The data is analyzed and extensively compared to experimental measurements, with emphasis on species and temperature predictions, burnout statistics, radiation, and devolatilization and ignition behavior. To be able to better understand the ignition process and provide a database for flamelet modeling, the code is extended for pulverized coal combustion simulation DNS. This includes the incorporation of species transport, chemical kinetics and appropriate solvers. The DNS data is analyzed in detail, focusing on the ignition behavior, burning modes, heat losses and pseudo-flamelet structures, providing valuable implications for flamelet modeling in the LES.For the second part of this work, a transported filtered density function (FDF) method is implemented into the LES code. This transported FDF method is then modified to combine cost-effective flamelet-based presumed FDF models with accurate transported FDF finite rate chemistry strategies in a hybrid manner. The hybrid method relies on seeding Lagrangian particles representing the transported FDF only at those locations of the flame where the flamelet model is insufficient, aiming to improve accuracy at an affordable cost. This hybrid method is tested on the Sydney/Sandia piloted jet flame with inhomogeneous inlets. It is shown that the method can accurately predict the flame with a greatly reduced number of computational particles." @default.
- W2938389218 created "2019-04-25" @default.
- W2938389218 creator A5079673812 @default.
- W2938389218 date "2018-02-19" @default.
- W2938389218 modified "2023-09-27" @default.
- W2938389218 title "Large eddy and direct numerical simulation of single and multiphase flows relying on lagrangian particle methods" @default.
- W2938389218 hasPublicationYear "2018" @default.
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