Second-moment closure model for IC engine flow simulation using Kiva Code

Document Type

Article

Publication Date

4-1-2000

Abstract

A study on the flow and turbulence in an IC engine cylinder was carried out utilizing the SSG variant of the Reynolds stress turbulence closure model. In-cylinder turbulence is characterized by strong turbulence anisotropy and flow rotation, which aid in air-fuel mixing. It was argued that solving the differential transport equations for each turbulent stress tensor component, as implied by second-moment closures, could better reproduce stress anisotropy and influences of rotation, than with eddy-viscosity models. Thus, a Reynolds stress model meeting the demands of in-cylinder flows was incorporated into an engine flow solver. The solver and SSG turbulence model were successfully tested with two different validation cases, i.e., an axisymmetric direct-injected stratified charge engine with a bowl in the piston (liquid gasoline in the form of a hollow cone spray was injected into the cylinder), and a teapot geometry for a two-stroke engine with side ports included. Simulations were then applied to IC-engine like geometries. The Reynolds stress model predicted additional flow structures and yielded less diffusive profiles than those predicted by an eddy-viscosity model.

Publication Title

Journal of Engineering for Gas Turbines and Power

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