NUMERICAL METHODS FOR TREATING DISPARATE SCALES IN HIGH-SPEED REACTING FLOWS

Abstract

Multiple length and time scales exist in high-speed reacting flows and need to be treated with due care when such flows are modeled. In this study, two numerical aspects relevant to reacting flow computations are addressed: (I) alternatively a fully implicit and a prediction-correction splitting procedure for treating the stiff source terms arising in the chemically reacting flow field, and (2) a source term reseating procedure to accommodate the disparate scales in the flow field. A shock-induced combustion scenario resulting from a hypersonic projectile flow is used as the test problem to facilitate investigation of these issues. It is found that the splitting procedure can capture the coupling of the fluid dynamics and chemical reactions accurately, while reducing the computational requirements, and the reseating treatment can compensate for the error caused by inadequate numerical resolutions.

Additional information

Notes on contributors

Wei Shyy

Address correspondence to Professor Wei Shyy, University of Florida, Department of Aerospace Engineering, Mechanics, and Engineering Science, 231 Aerospace Building, Gainesville, FL 32611-6250. E-mail: [email protected]