Abstract
In order to establish the lateral boundary conditions of a high accurate DNS (Direct Numerical Simulation) for round jets, we propose the new hybrid scheme, in which sine or cosine series and 6th order compact scheme are used for the discretization. Compared to the experimental data concerning a free jet, it is found that the proposed scheme is capable of predicting well the flow properties such as mean and fluctuating velocity. Also from the mean velocity vectors and entrainment quantity, it confirms that the entrainment can be captured correctly using the present scheme.
