High-Fidelity Direct Numerical Simulations of Turbulent Combustion - Compression Ignition under HCCI Conditions and NOx Formation in Turbulent Jet Flames
EMSL Project ID
13503
Abstract
This is a continuation proposal of the multi-university collaborative program on high-fidelity direct numerical simulations of turbulent reacting flows with detailed chemistry. Recognizing the complexities in development of various code components and their integration, a consortium of researchers with interdisciplinary skills from multiple institutions (University of Maryland, University of Michigan, University of Wisconsin, Sandia National Laboratories) will establish collaborative efforts to re-design and enhance the capabilities of the DNS code, S3D, by utilizing object-oriented code structure based on Common Component Architecture (CCA). It is anticipated that the proposed project will prove to be a strong showcase of a paradigm shift from a traditional scientific code development, and will demonstrate that the synergistic outcome is greater than the sum of individual efforts.During the proposed work, the existing DNS capabilities will be substantially enhanced and completed in terms of sophistication and versatility of the numerical algorithms and physical modules. The numerical developments will include the immersed boundary method for complex geometry with high-order interpolation schemes, high-order implicit/explict (IMEX) stiff time integrator based on additive Runge-Kutta (ARK) method, and adaptive mesh refinement (AMR) to provide flexible spatial resolution. The physical model developments will feature advanced soot models based on detailed representation of soot formation paths via the method of moments, spray injection and droplet distortion models to represent direct injection events.
The CCA environment will allow exchanging software components developed by different teams working on complementary tasks under the SciDAC program. For example, the mesh component for high-order structured adaptive mesh computation based on the GrACE framework, the transport component for evaluation of transport properties in gaseous mixtures, and interpolation component using high-order spatio-temporal interpolation operators, which are being developed by CFRFS, will be readily adopted into S3D to benefit its versatility of realistic combustion system simulations. The CCA-compliant DNS toolkits will further allow access to various post-processing functionalities for effective data-mining and visualization that are being developed under the BES Chemical Sciences core program and CMCS.
The project will culminate by demonstrating several pilot simulation studies of laboratory-scale flames, which will address fundamental science issues of soot characteristics and spray dynamics. The proposed configurations include partially-premixed turbulent counterflow and jet flames, and turbulent spray jet evaporation and ignition problems, thereby providing a valuable database to assess flamelet versus non-flamelet mode combustion, and to study the impact of turbulence on spray evaporation and combustion.
The extensive collaboration among multiple institutions and projects will bring together a critical mass of interdisciplinary skills, in order to accomplish the level of terascale DNS studies that would otherwise have not been possible by the traditional approach. The exchange of knowledge and components throughout the proposed partnership will ensure the successful development and long-term support of the DNS toolkits, thereby maximizing its impact in the combustion research community.
Project Details
Project type
Exploratory Research
Start Date
2005-02-10
End Date
2005-12-15
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members