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An integrated 1d-2d fluid dynamic model for the simulation of wave action in i.c. engine manifolds
Technical Paper
1999-24-0005
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Language:
English
Abstract
The research work concerning the development of an integrated 1D-2D fluid dynamic code for the simulation of unsteady flows in i.c. engine pipe systems is described. A comprehensive 1D simulation model, named GASDYN, which is based on symmetric shock-capturing schemes, has been coupled to a local 2D inviscid model, named GASDYN2D, for the solution of the Euler equations on Cartesian structured grids. The numerical 2D model is based on a second-order Godunov method, which makes use of the Roe''s approximate Riemann solver. The coupling of the two models has been realised at the time step level, by linking the boundary cells of the 1D and 2D calculation domains. The integrated fluid dynamic code has been applied to predict the wave motion in the exhaust system of a single-cylinder Diesel engine, applying the 2D modelling only to critical regions of the duct system, represented by a tapered duct and an Helmholtz resonator. Predicted results concerning the velocity flow field and the pressure contours are reported.