Hello, A change in allocation has been requested: Requester: ssom (Sibendu Som) Project: LES-Engine Title: Effect of LES resolved spray coupled with reduced kinetics on engine performance 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 diesel engine. 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 simulations on GE hardware. Through this collaboration the following activities are planned; 1. Dynamic structure based LES turbulence model coupled with reduced kinetics to evaluate engine performance using a sector mesh. a. This coupling of LES turbulence models with reduced kinetics is being attempted for the first time. A sector mesh is planned for to keep run times less than a week. 2. Comparison of existing modeling capability against the advanced approaches highlighted above. If indeed these advanced modeling techniques coupled with supercomputing is beneficial for GE; then we need to assess the scalability and speed-up of CONVERGE code with GE-hardware as a continuing exercise. The specific methods used for the multi-phase, reacting flow simulations with moving boundaries will include: 1) Finite volume schemes 2) LES (dynamic structure) and RANS turbulence models used 3) Detailed chemical kinetic models for diesel fuels 4) CONVERGE software is being used - ~128 licenses available 5) Scales well up-to 128 processors 6) Detailed spray models used for different spray processes Current: undetermined amount Justification: Requested: 75000 A specific reason has been given: We would like to redistribution the allocation given to this project from 450K, 50K, 0K and 0K for Q1, Q2, Q3 and Q4, respectively, to 125K per quarter. Towards that end, since we've been granted 50K for the current quarter, we are requesting an addition 75K for the current quarter. This needs to be approved and the final allocation amount decided upon. Thank You, The LCRC Accounts System