Calculation of 1-D Unsteady Flows in Pipe Systems of I.C. Engines

[+] Author and Article Information
T. Bulaty, H. Niessner

Brown Boveri and Co., Ltd., Lindenhof 3, CH-5430 Wettingen, Baden, Switzerland

J. Fluids Eng 107(3), 407-412 (Sep 01, 1985) (6 pages) doi:10.1115/1.3242501 History: Received June 25, 1984; Online October 26, 2009


Linear finite-difference methods of higher than first-order accuracy applied to the calculation of 1-D unsteady flow inevitably produce numerical overshoot at discontinuities. Several remedies have been proposed in the past; a simple and effective one is flux correction. We propose it in the naive form, which destroys neither the order of accuracy nor the stability of the underlying method. Particular problems arise at the boundaries, where appropriate precautions help to fulfill the conservation laws. Additionally allowing for elasticity of the valve control system, results with acceptable accuracy are obtained in supercharging practice. A comparison of computing time, accuracy and storage requirements confirms the advantages of naive flux correction.

Copyright © 1985 by ASME
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