Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Sibendu Som Project Name: gm_gasexchange Division: ES Project title: CFD Study of Impact of Part-to-Part Variations on Spark-Ignition Engine Charge Formation Associated funding: HPC4Mfg program from AMO office of DOE Other Systems: Ford Science: Spark-ignition engines are the backbone behind people transportation around the world. The efficiency of spark-ignition engines is limited in practice by variations between engine cycles and cylinders within an engine that result from the manufacturing processes/tolerances. These variations impact knock limits and dilution tolerance, which results in more conservative settings for design and calibration settings, such as compression ratio, valve timing, and exhaust gas recirculation rates. Engine variations also have a significant impact on emissions generation, which can have a secondary impact on efficiency. A deeper understanding of the relative importance of these variations and their interactions on the charge preparation process can guide future decisions on machining tolerances and control strategies. This project will develop simulation tools and methodology to include the effects of some key manufacturing tolerances and their impact on engine performance an d emissions. Project description: The main scope of this project is to use multi-cycle LES to characterize the effects of some key manufacturing tolerances on engine performance, emissions, and cyclic variability. The project for the current year is divided into two major parts. In the first part, the LES setup will be validated using the baseline experimental data. The validation process will involve modifying model constants based on the experience of PIs to match the experimental data. In the second part of this project, the effect of manufacturing tolerances on the engine performance will be evaluated. The tolerances that will be evaluated includes the differences in compression ratio (CR) between engine cylinders of a multi-cylinder engine, spark plug orientation, tolerances around the intake port that may affect the charge motion, etc. COV of mean effective pressure, peak pressure in a cycle, and crank angle location for 50% or 90% of fuel burnt will be the metrics used to compare the findings from the multi-cycle LES calculations for all these three parameters. Industry partnership: Ford Motor Company Project URL: http://verifi.anl.gov/ Current FY Hours Used: undetermined amount New FY Requested allocation: 1000000 Q1: 250000 Q2: 250000 Q3: 250000 Q4: 250000 Justification: Our recent publication (J. Kodavasal, K. Harms, P. Srivastava, S. Som, S. Quan, K.J. Richards, M. Garcia, “Development of stiffness-based chemistry load balancing scheme, and optimization of I/O and communication, to enable massively parallel high-fidelity internal combustion engine simulations,” Journal of Energy Resource Technology; JERT-16-1022, 2016) together with MCS and Convergent Science discusses the improvements to the Converge tool that has resulted in significant improvement in scaling. Currently, we are able to scale the code up to 4096 processors on Mira with about 70% scaling efficiency for a fixed mesh size. This was achieved due to the implementation of: (1) MPI I/O, (2) Improved Communication, (3) METIS load balancing scheme, (4) Development of a new chemistry load balancing scheme. The above changes are not only expected to benefit calculations on Mira but also help on computing clusters like Blues and Bebop. Storage requirements: 5 TB Thank You, The LCRC Accounts System