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The main purpose of the article is to present a scavenging modeling process in the opposed-piston two-stroke engine. Recently, a opposed-piston arrangement, characterized by two pistons reciprocating opposite to each other, has been investigated more often as an attractive alternative to the conventional four-stroke engines. The clue of its renaissance is connected with a wide gamut of benefits compared to a standard design. The uniflow scavenging process is definitely one of them and it can be treated as a basis for gas dynamic modeling in concept opposed-piston engine. The paper describe an efficient way of three dimensional scavenging process modeling that is based on Computational Fluid Dynamic (CFD) simulations. Input parameters consists of the intake and exhaust ports shape, the scavenging pressure and the angle phase piston shift. The simulations are provided with specific scavenging quality factors that are described in details. Additionally, the impact of the scavenging on the in-cylinder mixing is examined. The importance of the in-cylinder mixture preparation is directly combined with the combustion process. In this case zero dimensional combustion modeling results are used for the CFD numerical analyses. The article is supposed to provide a reader with a general view of the piston ported timing system and scavenging in the opposed-piston two-stroke engine. It may be considered as a basis for modeling such a system in a similar design. Authors share the results that may help to figure out the main challenges in piston ported timing system designing.