Lagrangian Fluid Dynamics for Combustion Modelling.
Abstract
Recent flow visualization experiments have shown the need to follow the behavior of dynamically interacting coherent structures in both cold flows and flames. Since these structures move the fluid, a Lagrangian approach is especially useful in theoretical calculations because we can observe the interaction of a particular fluid element with its changing environments as the flow evolves. One-dimensional Lagrangian flame models are successful because they also minimize the effects of numerical diffusion which is the bane of laminar flame calculations. However, most two- and three-dimensional flame models are Eulerian because of problems in standard Lagrangian formulations for multi-dimensional models and because phenomenological turbulent diffusion terms are usually added which mask the numerical diffusion. The purpose of this paper is to describe one- and multi-dimensional Lagrangian algorithms which eliminate many of the problems previously associated with this approach. An example of a one-dimensional flame calculation which incorporates the new ideas will be given. Finally, examples will be given of the two-dimensional Lagrangian triangular gridding technique and it will be indicated how this may be applied to multi-phase combustion problem. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 21, 1981
- Accession Number
- ADA101980
Entities
People
- Elaine Oran
- Jay Paul Boris
- M. J. Fritts
Organizations
- United States Naval Research Laboratory