Hello, A change in allocation has been requested: Requester: ssom (Sibendu Som) Project: GasTurbineCombustion Title: Benchmark Combustion Simulations for Gas Turbine Applications Description: With the use of parallel processing and highly-scalable CFD solvers, LES is becoming an increasingly practical technique for modeling the turbulent flow in internal combustion engines. Recently it has been shown by Argonne and CSI that LES can provide good qualitative and quantitative comparisons to instantaneous engine spray measurements since it directly resolves the large scales in the flow field. Grid-convergence behavior of a dynamic structure based LES model was demonstrated by employing minimum cell sizes in the order of 30 microns under evaporating but non-combustion spray conditions. This methodology has not yet been applied to the simulation of a gas turbine combustion using the CONVERGE code. We propose to run the combustion simulations at a lower equivalence ratio with an LES turbulence model. Using the LES model should capture the unsteady combustion behavior. A disadvantage of LES turbulence model is that the simulations typically require more grid resolution than a RANS simulation. Comparisons on emissions (CO, CO2, NOx) will be performed between RANS and LES simulations. Demonstration of grid-convergence in a real engine simulation is challenging due the need to resolve finer flow structures across larger volumes which may result in high computational costs. This project will address these challenges by using advanced load-balancing algorithms (such as METIS), reduced chemical kinetic models for combustion (ensuring that the fidelity of the model is very high under the operating conditions), multi-zone model, HPC resources to ensure lower wall-clock times, adaptive mesh resolution technique to add cells in desired locations of high temperature, species, and velocity gradients, and sector simulations for bench-marking the LES. The key will be to develop “best practices” for LES gas turbine combustion simulations. Current: undetermined amount Justification: Requested: 350000 A specific reason has been given: This project is in collaboration with CSI for benchmarking large flame simulations simulations. We underestimated the wall-clock time for these simulations originally. This needs to be approved and the final allocation amount decided upon. Thank You, The LCRC Accounts System