which is sketched in Fig. 2(a). A jet coaxial with the valve stem establishes for large valve lifts, as illustrated in Fig. 2(b). Annand and Row [13] suggest a transition between the two flow regimes at a valve lift to valve diameter ratio Lv=Dv of 0:2. This ratio was proposed based on measurements,which indicated a decrease in the discharge coefficient at higher valve lifts than this ratio. Nonetheless, a comprehensive assessment of the flow field in the exhaust port remains challenging.Therefore, several numerical approaches have been used to simulate the gas outtake process of the internal combustion engine. The investigation of the unsteady, three-dimensional flow field requires a simulation approach