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- W2510197003 abstract "We develop a semi-implicit algorithm for time-accurate simulation of the compressible Navier-Stokes equations, with special reference to wall-bounded flows. The method is based on linearization of the partial convective fluxes associated with acoustic waves, in such a way to suppress, or at least mitigate the acoustic time step limitation. Together with replacement of the total energy equation with the entropy transport equation, this approach avoids the inversion of block-banded matrices involved in classical methods, which is replaced by less demanding inversion of standard banded matrices. The method is extended to deal with implicit integration of viscous terms and to multiple space dimensions through approximate factorization, and used as a building block of third-order Runge-Kutta time stepping scheme. Numerical experiments are carried out for isotropic turbulence, plane channel flow, and flow in a square duct. All available data support higher computational efficiency than existing methods, and saving of resources ranging from $85%$ under low-subsonic flow conditions, to about $50%$ in supersonic flow." @default.
- W2510197003 created "2016-09-16" @default.
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- W2510197003 date "2016-08-30" @default.
- W2510197003 modified "2023-09-27" @default.
- W2510197003 title "An efficient semi-implicit solver for direct numerical simulation of compressible flows at all speeds" @default.
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