Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Sibendu Som Project Name: LES-sprays Division: ES Project title: Modeling dynamic coupling of internal nozzle flow and spray formation for Gasoline Direct Injection Applications Associated funding: DOE - Office of Vehicle Technologies Other Systems: Convergent Science Inc. Science: The effect of needle movement and internal nozzle flow on external spray formation have always intrigued the scientific community. The coupling of nozzle flow and spray formation is dynamic in nature and high-fidelity simulations with pragmatic choice of spatial and temporal resolutions are needed to elucidate the physics of this multiphase problem in Gasoline Direct Injection (GDI) systems. Such developments are of extreme interest to Department of Energy (DOE) and the automotive industry. Project description: The dynamic coupling of nozzle flow and spray formation will be achieved using Eulerian-Lagrangian Spray Atomization approach. The liquid fuel will remain in the Eulerian framework while exiting the nozzle. Thereafter, depending on local instantaneous liquid concentration in a given cell and amount of liquid in the neighboring cells, part of the liquid mass will be transferred to Lagrangian framework in the form of droplets. Such approach requires additional transport equation apart from the conservation equations of mass, momentum, species, energy, and turbulence in Eulerian framework. This additional equation is termed as the Σ equation. Σ represents the liquid-gas interfacial area per unit volume in a given computational cell. This special type of modeling in Eulerian framework is known as Σ-Y approach, which originated from flame surface modeling in the spray combustion community. This hybrid approach will have the potential of capturing the trans ient flow characteristics due to needle movement transcending downstream and affecting time-fluctuating spray phenomenon. The back-flow of chamber gas into the stepped holes of a GDI system causing the spray to taper towards the injector exit and our simulation work was one of the first few studies that demonstrated the phenomenon. Different chamber conditions will be used (flashing and non-flashing) will be used along with a variety of fuels (single and binary). The goal will be to provide an unforeseen development in GDI spray literature. Industry partnership: Convergent Science Inc. Project URL: http://www.transportation.anl.gov/engines/multi_dim_model_home.html 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. Storage requirements: 5 TB Thank You, The LCRC Accounts System