A Conservative Overset Grid Method for Numerical Simulation of Propeller Slipstream

摘要

Reasonable interpolation between overset meshrninterfaces is one of the bases to ensure correctrncalculation of flow fields, non-conservativerninterpolation is insufficient to guarantee the massrnfluxes in the numerical simulation of propellerrnslipstream. This paper develops a conservativerninterpolation method for hybrid overset mesh based onrnsupermesh technology and centre-based finite volumernmethod. A method to build the local supermesh duringrnoverset grid interface by the cell-cut algorithm isrnpresented, and flow field variables could berninterpolated conservatively during overset meshesrnwith second-order accuracy via the local supermesh.rnNumerical results show that the presented method isrnstrictly conservative for second-order distributed flowrnfield variables. Compared with trilinear interpolationrnmethod and reverse distance-weighted interpolationrnmethod, the numerical errors are decreased and thernvariables are interpolated more accurately with thernpresented method, the convergence process of residualrnerror is accelerated, and the contour of flow field isrnsmoother when the cell scale matches badly at therninterface.