Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Sibendu Som Project Name: foam-EngineProcesses Division: ES Project title: Comparison of OpenFOAM and CONVERGE for predicting near nozzle flow physics Associated funding: DOE-Vehicle Technologies Office Other Systems: CMT, Spain Science: It is well established that in-nozzle fuel flow behavior influences the downstream spray which in turn affects the fuel-air mixing, ignition, combustion, and emission characteristics. However, most of the computational research till date has focused on developing either nozzle flow or downstream spray-combustion models with only adhoc coupling at the nozzle exit boundary. Due to the lack of a robust coupling methodology between in-nozzle flow and downstream spray, the existing tools to simulate engine performance often are not predictive in nature. Quantitative experimental data in the near-nozzle region is also difficult to obtain in this dense core region. This is a major limitation towards validating nozzle flow and spray models. In-nozzle flow simulations for diesel injector nozzles have mainly been performed with three different modeling approaches: (1) mixture based Eulerian, (2) multi-fluid Eulerian, and (3) Eulerian-Lagrangian model. Project description: The mixture based approaches assume that the fluid is a continuous mixture of liquid and vapor and hence possess the same velocity. This necessitates solving a single momentum equation for the mixture and hence is computationally cheap. The main drawback of this approach is that large scale cavitation contours can be captured quite well, however, bubbly flow features cannot be predicted. The multi-fluid Eulerian approach is characterized by different sets of conservation equations for each of the phases. Thus each phase has its own velocity and the computational costs associated are higher than that of the mixture based approaches. In the Eulerian-Lagrangian approach, the liquid is in a continuum while the vapor is the dispersed phase represented by parcels of bubbles. The vapor bubbles trajectories can be tracked with the Newtonian equation of motion for each parcel. Sub-models for bubble collision, breakup, and coalescence are also developed. Overall, although this approach is computationally expensive, it can provide good results in bubbly flow regimes. We are expecting to get a visiting scholar from CMT in Spain to spend 6 months with us and compare the above mentioned approaches implemented in OpenFOAM and CONVERGE against x-ray radiography data from ANL. Industry partnership: None Project URL: http://www.transportation.anl.gov/engines/multi_dim_model_home.html Current FY Hours Used: undetermined amount New FY Requested allocation: 450000 Q1: 0 Q2: 150000 Q3: 150000 Q4: 150000 Justification: Storage requirements: 1 TB Thank You, The LCRC Accounts System