Mesh-sequenced Realizations for Evaluation of Subgrid-Scale Models for Turbulent Combustion (Short Term Innovative Research program)
Abstract
The proposed work develops a new framework, termed Multi-Resolution Analysis by Mesh-Sequenced Realizations (MRA-MSR) for on-the-fly evaluations of subgrid-scale models used to account for the effects of unresolved fluctuations in large-eddy simulation (LES) of turbulent combustion. The approach uses simultaneous, time-sequenced realizations of the flow at different mesh levels to provide a means of connecting evolved subgrid-scale information to models for the effects of such information on coarser meshes. MRA-MSR thus provides a bridge between classical a priori analysis techniques and a posteriori testing of LES subgrid models. The first task involves the extension of an existing two-grid MRA-MSR to at least three mesh levels. This will enable the finest mesh to approach direct numerical simulation (DNS)- like resolution and the coarsest meshes to approach the very large-eddy simulations often used in engineering practice. The second task enables transfer of sub grid-scale mass and energy fluxes as well as filtered chemical production rates ( or functions thereof) from fine to coarse meshes to further constrain the response of solutions evolved on these meshes. Attention is focused on closure of the filtered species production rates using detailed chemistry, perhaps the most difficult modeling challenge in turbulent combustion. Direct-quadrature methods for modeling these terms will be evaluated initially using MRA-MSR at conditions relevant to gas-turbine combustion. Analogues of the well-studied Sydney bluff-body flame experiments will be used as test cases for the new MRA-MSR framework
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2018
- Source ID
- W911NF1710074
Entities
People
- Jack R. Edwards
Organizations
- Army Contracting Command
- North Carolina State University
- United States Army