The assumption of one-dimensional unsteady flows in the inlet and exhaust systems of turbocharged diesel engines is widely used although multi-dimensional simulations using fluid dynamics are also possible. However, difficulties persist concerning the boundary conditions, particularly at the pipe ends (inflow or outflow) and at the intra-pipe boundary conditions (sudden or gradual area changes, bends, junctions, etc.). This paper focuses on the two first steps leading to a 1D flow simulation code: the selection of a numerical scheme and the study of an open end boundary condition. The first section compares several numerical algorithms, including Lax-Wendoff, Flux-Corrected-Transport methods (FCT), and Harten-Lax-Leer (Riemann solver), extended to the second order. The selection criterion is the best compromise between numerical instabilities and computational time. A numerical study using the Fluent CFD code is then presented on a constant area duct in order to determine some characteristics at the pipe end, specifically the dead zone length and the throat area. Finally, a model parameterized by the pressure ratio between inlet and outlet is proposed.
- Internal Combustion Engine Division
Some Basic Elements to Achieve a Future 1D Simulation of Wave Propagation in I.C.E. Pipes
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Chalet, D, Chesse, P, Hetet, J, & Tauzia, X. "Some Basic Elements to Achieve a Future 1D Simulation of Wave Propagation in I.C.E. Pipes." Proceedings of the ASME 2002 Internal Combustion Engine Division Spring Technical Conference. Design, Operation, and Application of Modern Internal Combustion Engines and Associated Systems. Rockford, Illinois, USA. April 14–17, 2002. pp. 55-62. ASME. https://doi.org/10.1115/ICES2002-449
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