Analysis of a decoupled implicit method for aerothermodynamics and reacting flows

Graham V. Candler, Pramod K Subbareddy, Ioannis Nompelis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We propose a new implicit computational fluid dynamics method for steady-state compressible reacting flows. The concept is to decouple the total mass, momentum, and energy conservation equations from the species mass and internal energy equations, and to solve the two equation sets sequentially. With certain approximations to the implicit system, it is possible to dramatically reduce the cost of the solution with little to no penalty on convergence properties for many problems. The cost of the decoupled implicit problem scales linearly with the number of species, as opposed to the quadratic scaling for the conventional fully-coupled method. Furthermore, the method reduces the memory requirements by a significant factor. We find that the performance of the method decreases as the relative reaction rates become very large and when the reactions are strongly exothermic. Several approaches are explored to improve the performance of the method for these cases. The decoupled implicit method shows promise for application to aerothermodynamics problems and reacting flows.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624101816
DOIs
StatePublished - Aug 19 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

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