Computational PDEs Unit: Engine knock project

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Engine knock project

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SPRINT2D is being used in an EPSRC project with the Dept. of Mechanical Engineering to model the `knock' effect in car engines, caused by autoignition in end gases causing large pressure pulses to form and interact with the edges of the engine cylinder. The problem is specified by a system of 5 PDEs representing conservation of mass, momentum and energy together with a species equation. Details are given in [45].

The two figures below show some example results for the calculated pressure in the engine cylinder. The left-hand figure is at an early time when pressure waves can be seen moving away from three `hot spots', and the right-hand figure is at a later time when a large pressure peak can be seen on the cylinder edge.

Pressure in Engine Cylinder at an Early Time Pressure in Engine Cylinder at a Later Time

The next two figures show a typical adaptive mesh along with the velocity vectors, and the density, mass fraction and pressure values at around the same time as the left-hand figure above.

Typical Adaptive Mesh with Velocity Vectors

ALT="Typical Adaptive Mesh with Density, Mass Fraction and Pressure Values"

Acknowledgements: Prof C.G.W.Sheppard, Dr J.Pan, Dept. of Mechanical Engineering, University of Leeds. Also, Dr J.M.Ware (ex-staff) School of Computing, University of Leeds.

Last Modified: 02Aug00

rogerf@comp.leeds.ac.uk