High performance computing of the Darmstadt stratified burner by means of large eddy simulation and a joint ATF-FGM approach
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Current trend in design and operation of industrial gas turbines or internal combustion engines implies using the lean-fuel and stratified conditions aiming at the reduction of the harmful emissions and efficiency improvement. This has led to an increasing use of computational methodology, which allows detailed insight into combustion physics and processes controlling the emission formation. In the present work, the Darmstadt stratified burner is investigated by means of Large Eddy Simulation, implemented into the in-house, finite-volume-based numerical code FASTEST. The code solves the incompressible, variable-density Navier–Stokes equations coupled with the species transport equations. It is parallelized via domain decomposition technique using message passing interface (MPI). The complex chemical mechanisms are described by tabulated detailed chemistry utilizing the Flamelet Generated Manifolds (FGM) approach combined with the Artificially Thickened Flame model (ATF). The results obtained are comparatively assessed along with the complementary measurements. In-depth analysis of the flow field is conducted based on numerical simulations. Further studies have been carried out with respect to grid resolution and scalability.
KeywordsStratified combustion Large eddy simulation Tabulated chemistry Flame-turbulence interaction
The project is supported by the ‘Excellence Initiative’ of the German Federal and State Governments and the Graduate School of “Computational Engineering” and “Energy Science and Engineering” at Technische Universität Darmstadt. The authors acknowledge the financial support of the Numerical Simulation on the High Performance Computers (NuSim) project within subproject 2. The first author’s special thank goes to the Faculty of Mechanical Engineering at his home university in Sarajevo.
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