Abstract: In the position element algorithm of DSMC, the crucial questions to be solved arethe exact description of body surface configuration and precise determination whether a moleculecomes into collision with a certain surface element. Those issues are directly related to the accuracyin calculation of aerodynamic force and heating. In order to solve these questions, two innovationsconcerning the improvement of our position element version in the calculation of three-dimensiontransitional flow by the DSMC method a...