TY - GEN
T1 - Analysis of a decoupled implicit method for aerothermodynamics and reacting flows
AU - Candler, Graham V.
AU - Subbareddy, Pramod K
AU - Nompelis, Ioannis
PY - 2013/8/19
Y1 - 2013/8/19
N2 - 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.
AB - 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.
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U2 - 10.2514/6.2013-1006
DO - 10.2514/6.2013-1006
M3 - Conference contribution
AN - SCOPUS:85087244589
SN - 9781624101816
T3 - 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
BT - 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Y2 - 7 January 2013 through 10 January 2013
ER -