The Eulerian Lagrangian Mixing-Oriented (ELMO) Model

TL;DR

The paper introduces the ELMO model, a new mixing-oriented spray model that improves predictive accuracy for dense sprays in engine simulations by focusing on physics-based assumptions and limited constants.

Contribution

A novel spray model based on mixing physics, implemented in CFD, with full two-way coupling and validated across diverse engine spray conditions.

Findings

Effective in modeling dense spray cores

Requires fewer modeling constants

Validated with diesel and gasoline engine sprays

Abstract

Past Lagrangian/Eulerian modeling has served as a poor match for the mixing limited physics present in many sprays. Though these Lagrangian/Eulerian methods are popular for their low cost, they are ill-suited for the physics of the dense spray core and suffer from limited predictive power. A new spray model, based on mixing limited physics, has been constructed and implemented in a multi-dimensional CFD code. The spray model assumes local thermal and inertial equilibrium, with air entrainment being limited by the conical nature of the spray. The model experiences full two-way coupling of mass, momentum, species, and energy. An advantage of this approach is the use of relatively few modeling constants. The model is validated with three different sprays representing a range of conditions in diesel and gasoline engines.