Development of the Four-cylinder Moving Mesh Model for a 1.6 Litre Four-stroke Direct-injection Engine

The design of a modern internal combustion engine requires the use of advanced analysis and development tools to carry an in-depth investigation on internal combustion process and computational fluid dynamics (CFD) simulation by using high performance computers. In this work, the algorithm for moving or deformed mesh for a 1.6-litre four-cylinder four-stroke direct-injection engine has been developed. This type of mesh is required for transient simulation of fluid flow and combustion process inside the combustion chamber of an internal combustion engine. This mesh deforms with the movement of intake and exhaust valves as well as piston. Hence, the purpose of the work is to verify the moving mesh algorithm and to establish the correct mesh configuration at any crank angle. The simulation covers the full engine cycle consisting of intake, compression, power and exhaust strokes and the orderof piston motion is set according to the firing order of the selected engine. The algorithm established defines events in which any of the designated engine components moves in terms of time and duration of occurence. The verification of teh algorithm was performed for the whole four-stroke cycle of 720 degree crack angle, where the position of the intake valve, exhaust valve, cylinder and piston were updated accordingly with respect to crack angle. The finalised algorithm and mesh can be used to simulate the in-cylinder fluid flow and internal combustion process for the full engine cycle.