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1、Future Development of CONVERGE: A Roadmap to Increasing the Predictive Capability of Engine Simulations Daniel Lee, Ph.D. Convergent Science, Inc. IDAJ CAE Solution Conference 2013 CONVERGE Conference Day November 7th, 2013 Yokohama, Japan Gasoline Combustion Modeling of Direct and Port- Fuel Inject
2、ed Engines using a Reduced Chemical Mechanism Comparison of initial flame development from two different spark location Courtesy Prometheus Applied Technology Overview of Presentation Company Overview Technology Overview Combustion Modeling Spray/nozzle modeling Emissions modeling Conjugate heat tra
3、nsfer Gasoline HCCI Diesel Natural Gas Founded in 1997, headquartered in suburbs of Madison, Wisconsin Experts in CFD flow, spray, combustion Developed CONVERGE CFD which is widely used in the automotive industry Rapidly growing and stable organization with many satisfied customers CSI currently has
4、 40 employees and maintains distributors throughout the world Recently purchased a 40,000 square foot office and will be relocating in early 2014 Maintains a strong academic program with an installed base of over 50 universities Maintain strategic partnerships with thought leaders for technology imp
5、rovement. Lawrence Livermore, Argonne, Sandia, Oak Ridge, Sandia etc Convergent Science Inc. (CSI): Summary Current Convergent Science Inc. headquarters in Wisconsin USA Future Convergent Science Inc. headquarters in Wisconsin USA 40 Current CONVERGE CFD Software Spray combustor simulated with LES a
6、nd detailed chemistry. All meshing 100% automated Ignition and Combustion Simulations of Spray-Guided SIDI Engine using Arrhenius Combustion with Spark-Energy Deposition Model SAE technical paper 2012-01-0147 Couresy General Motors CONVERGE CFD software was developed with the goal of increasing both
7、 productivity and accuracy for modeling flow, spray and combustion: Generates a high quality mesh automatically at runtime thus eliminating all user meshing Adds mesh refinement based upon gradients using adaptive mesh refinement (AMR) Extensive parallel processing technologies for high performance
8、computing Rich suite of physical models for spray, combustion and turbulence Lagrangian models include spray breakup, collision, coalescence and wall film SAGE detailed chemistry solver Extensive suite of RANS and LES models State of the art suite of emissions models CONGO genetic algorithm included
9、 which automatically spawns CONVERGE simulations for optimization CONVERGE Philosophy 100% eliminate all user meshing time Add more mesh resolution in key areas (Adaptive mesh refinement & embedding) Detailed chemistry with large mechanisms State of the art spray models State of the art turbulence m
10、odels (LES) High performance computing Optimization (let the computer do the work whenever possible) Run more cycles and more cylinders whenever possible VOF modeling test case with moving components CONVERGE Studio Full case setup (mesh, spray, combustion etc) with error checking Plotting utility C
11、hemistry reduction environment Designed for quick and easy case setup Ensight Desktop for CONVERGE Ensight Desktop for CONVERGE now comes bundled as a standard feature of CONVERGE. If the user prefers, other postprocessors can definitely be used as well. Sealing Feature In older versions of CONVERGE
12、, moving components couldnt touch In v2.1, a sealing feature was introduced which eliminates this restriction The sealing feature automatically re- triangulates the surface during the simulation allowing surfaces to come into contact (i.e., “sealing”) This feature is very useful for two stroke engin
13、e transfer ports as well as rotary engines Sealing capability can be set up in CONVERGE-Studio “sealing” tab Two stroke (above) and rotary engine (left) simulations utilizing sealing feature Fluid Structure Interaction 9 With CONVERGE, moving body problems are easy to set up Moving boundaries arent
14、a problem as new mesh is automatically generated every timestep so The motion of moving bodies is often specified (valves and pistons) A six degree of freedom (6-DOF) solver has been implemented for fluid structure interaction The pressure and viscous forces are integrated to used to determine the m
15、otion of moving components The 6-DOF solver has many applications including valves and compressors Fluid structure interaction in CONVERGE Representative compressor geometry from “A Simplified Computational Fluid Dynamics Model for the Suction Process of Reciprocating Compressors” Collaboration with
16、 Caterpillar Inc. and Argonne National Laboratory *Som et al. SAE 2013 High Performance Computing CONVERGE is widely used in HPC SAGE parallelizes independently from the flow Dynamic load balancing is available METIS is now available which improves load balancing Load balancing improves with more cells and more chemistry Significant improvem
