Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Riccardo Scarcelli Project Name: GDI_lean_burn Division: ES Project title: Advanced Dilute Combustion in High-Efficiency Gasoline Engines Associated funding: DOE Vehicle Technologies Program Office Other Systems: Science: This project deals with lean and EGR dilute combustion in direct injection gasoline (GDI) engines. It focuses on advanced ignition systems and investigates their effects on combustion stability. Improved combustion stability as well as potential extension of lean and dilute operating limits are going to be the key criteria for the assessment of advanced ignition systems. 3D-CFD simulation plays a key role in carrying out fundamental analysis of the interaction between the ignition source and the local physical and chemical properties during the ignition event and in determining engine operating parameters to fully utilize the potential of each advanced ignition system. Project description: The objective of this project is to develop a numerical methodology for the analysis of combustion stability in a SI engine operating under extreme dilute conditions. From a simulation standpoint, the focus of this project is on two main topics: • Analysis of cycle-to-cycle variations in SI engines, especially under dilute operation • Analysis of the ignition process for conventional as well as alternative ignition systems The sub-tasks for FY 2016 will: 1) continue the evaluation of RANS and LES for combustion stability analysis; 2) carry out detailed description of the physics involved during spark discharge, laser breakdown, and transient plasma ignition; 3) optimize the geometry of the ignition systems to maximize the engine thermal efficiency; 4) use experimental data (x-ray radiography) to provide input for the ignition model development; 5) use experimental data (optical and metal engine) to validate numerical results. Simulations will be performed with the commercial code CONVERGE and computational grids of few million cells will require the use of 32-128 cores depending on the specific test case – ignition study or combustion vessel or actual engine - as well as mesh resolution and approach followed. The project involves two members (scarcell and zhanga) working full-time on it, with 2-4 cases running regularly. With an average estimate of 48 cores per run and 3 cases in parallel, the expected amount of core-hrs needed for this project for each quarter is: 48 cores x 24 hrs x 90 days x 3 jobs = 311,040. Considering some queue time. Our request is minimum 225,000 core-hrs per quarter. The effort will be evenly distributed within the four quarters. Industry partnership: Project URL: Current FY Hours Used: undetermined amount New FY Requested allocation: 900000 Q1: 225000 Q2: 225000 Q3: 225000 Q4: 225000 Justification: Recent scalability test (Sept 2015) performed on Blues provided following results: Case 1: Ignition studies on Spherical Flame – 80 time steps 1 node (16 cores) – walltime = 3613 sec 2 node (32 cores) – walltime = 2053 sec 88% 3 node (48 cores) – walltime = 1502 sec 80% 4 node (64 cores) – walltime = 1195 sec 76% Case 2: Simulation of ignition in a Combustion Vessel – 130 time steps 1 node (16 cores) – walltime = 3613 sec 2 node (32 cores) – walltime = 2170 sec 83% 3 node (48 cores) – walltime = 1650 sec 73% Storage requirements: Current project folder size is 3TB, we would like to request an increase up to 4TB due to increased amount of work and data in FY2016. Thank You, The LCRC Accounts System