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A New Parallel Cut-Cell Cartesian CFD Code for Rapid Grid Generation Applied to In-Cylinder Diesel Engine Simulations
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
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A new Computational Fluid Dynamics (CFD) code has been developed in order to overcome the deficiencies of traditional grid generation and mesh motion methods. The new code uses a modified cut-cell Cartesian technique that eliminates the need for the computational grid to coincide with the geometry of interest. The code also includes state-of-the-art numerical techniques and sub-models for simulating the complex physical and chemical processes that occur in engines. Features such as shared and distributed memory parallelization, a multigrid pressure solver and user-specified grid embedding allow for efficient simulations while maintaining the grid resolution necessary for accurate engine modeling. In addition, a new Adaptive Grid Embedding (AGE) technique has been developed and implemented. Sub-models for turbulence, spray injection, spray breakup, liquid drop dynamics, ignition, combustion and emissions are also included in the code. Further, a modified version of the commonly used KH-RT breakup model has been developed which incorporates viscosity effects in the Rayleigh-Taylor instability mechanism and removes the ad hoc breakup length concept.
The current work presents validation of the new modeling methodology over a wide range of Diesel engine combustion scenarios, including conventional single-injection Diesel cases and multiple injection strategies. The results indicate that this combination of rapid grid generation, modern numerical methods and state-of-the-art sub-models makes this code a powerful tool for internal combustion engine simulations.
- P. K. Senecal - Convergent Thinking, LLC
- K. J. Richards - Convergent Thinking, LLC
- E. Pomraning - Convergent Thinking, LLC
- T. Yang - Convergent Thinking, LLC
- M. Z. Dai - Convergent Thinking, LLC
- R. M. McDavid - Caterpillar, Inc.
- M. A. Patterson - Caterpillar, Inc.
- S. Hou - Caterpillar, Inc.
- T. Shethaji - Caterpillar, Inc.
CitationSenecal, P., Richards, K., Pomraning, E., Yang, T. et al., "A New Parallel Cut-Cell Cartesian CFD Code for Rapid Grid Generation Applied to In-Cylinder Diesel Engine Simulations," SAE Technical Paper 2007-01-0159, 2007, https://doi.org/10.4271/2007-01-0159.
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