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Continuity And Discontinuity in The Method Of Finite Element Applied To The Unsteady Flow And Some Optimization Problems Of The Admission Manifold Of A Passenger Car Fast Diesel Engine
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Event:
22nd FISITA Congress
Language:
English
Abstract
The use of the finite elements (FES) method for the computation of unsteady gas flow through the intake and exhaust pipes of a multi-cylinder engine set forth by the authors at the Congress of CIMAC’87 has been further developed by adapting a model with hybrid FEs; the model is based on the continuity-discontinuity duality. The state parameters of gases in a finite element (FE) have been broken into 1) field variables and 2) variables independent of spatial coordinates; the former allow continuity conditions in the knots whereas the latter do not; 3) compound variables. Gas state along the intake and exhaust lay-out has been defined as a system of four differential equations with partial derivatives of hyperbolic type which consider the fluid as compressible, viscous, in unsteady flow, with varying composition throughout its lay-outs. The strategy for solving the system consists in the change from partial derivative equations with respect to time and space to ordinary differential equations with respect to time only. The method has been applied to a 4-cylinder diesel car engine and computing results are compared to experimental data.
Citation
Grünwald, B., Oprean, M., and Gheorghiu, V., "Continuity And Discontinuity in The Method Of Finite Element Applied To The Unsteady Flow And Some Optimization Problems Of The Admission Manifold Of A Passenger Car Fast Diesel Engine," SAE Technical Paper 885121, 1988, https://doi.org/10.4271/885121.Also In
References
- Grünwald, B. Oprean, M. Gheorghiu, V. Finite Element Method for Calculating the Unsteady Gas Flow in Multi-Cylinder Engine Manifolds Warsaw
- Seifert, H. Die Analyse instationärer Strömungsvorgänge in Ansaugleitungen an Mehrzylinder Vergaser-motoren. XVI FISITA - Congress May 1976 Tokyo
- Selmin, V. Finite Element Solution of Hyperbolic Equations. I. One-Dimensional Case INRIA France April 1987
- Donea, I. A Taylor-Galerkin Method for Convective Transport Problems Internat. J. Numer. Meths. Engrg. 20 1984
- Brăteanu, C. Finite Element Models in Fluid Dynamics Bucharest Editura Acad. RSR 1983
- Lesinsky, J. Der Einfluss des Gas-wechsels auf den Arbeitsprozess Theorie. Experiment. Analyse. XXI FISITA - Congress Belgrade June 1986