Dynamic Structure Les Models
Abstract
A new dynamic structure (DS) approach for large eddy simulation modeling has been developed. The approach uses a tensor coefficient for the structure of the sub-grid stresses and a sub-grid kinetic energy for the magnitude of the stresses. The tensor coefficient is obtained directly from using the common dynamic approach' using the Germano identity. The sub-grid kinetic energy is obtained from a transport equation. The objectives of the program are: (i) to develop the DS approach for scalar transport with potential application to heat transfer problems and (ii) develop and test the DS formulation for rotating turbulence. The approach offers several significant advantages over existing approaches including: (i) no turbulent viscosity is used, (ii) an energy budget is enforced, (iii) very good prediction of the actual sub-grid stresses is obtained, and (iv) the model rests on a sound mathematical foundation that observes solvability constraints. New subgrid scale models are developed for subgrid scalar flux, subgrid scalar dissipation and subgrid scale energy dissipation. Models are evaluated a-priori using available DNS data for decaying isotropic turbulence, incompressible channel and Couette flows, and non-reacting mixing layer. A posteriori tests include LES of decaying isotropic turbulence and LES of incompressible mixing layer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2004
- Accession Number
- ADA430468
Entities
People
- Christopher J. Rutland
Organizations
- University of Wisconsin–Madison