Engineering notes numerical simulation of rotor flowfields based on several spatial discretization schemes

A method of unsteady rotor flowfield simulation was developed. Several spatial schemes were used for comprehensive comparison, some advantages and disadvantages of which were assessed. The overset grid technique was implemented, and the grid system was proven to have the capability to establish intergrid communication accurately. Comparisons among experimental data, previous references, and present simulation results were carried out to verify the accuracy and feasibility of the current methodology. Vorticity contours were also analyzed. To improve the identification efficiency of intergrid boundary points, a hole-map method is used. The flowfield variables of hole-fringe points are obtained by linear interpolation to establish intergrid communication, so it is necessary to identify donor elements for every hole-fringe point. An inverse-map method is adopted to accomplish the identification. With the help of a dual time-stepping method, an unsteady solution of the rotor flowfield was eventually obtained.