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基于SMAC(simplified marker and cell)方法和交错网格技术,发展了一套在贴体坐标系下求解三维不可压缩流动的数值算法,并应用该方法求解以逆变速度和压力为未知变量的Navier-Stokes方程,对弯曲度为2.3的三维90°方形截面弯管内部不可压缩流场进行了数值模拟.结果表明:文中提出的SMAC方法对强曲率弯管内流有较强的预测能力,能够较准确地模拟其主流和两次流的运动规律,从而证明了本算法的可靠性和有效性.
Based on the SMC (simplified marker and cell) method and the staggered grid technique, a set of numerical algorithms for solving three-dimensional incompressible flow in the body-fitted coordinate system are developed and applied to solve the Navier model with invertible velocity and pressure as unknown variables -Stokes equation is used to simulate the incompressible flow field in a three-dimensional 90 ° square curved elbow with a bending degree of 2.3. The results show that the proposed SMAC method has strong predictive ability for the inflow of strong curvature elbow, It can accurately simulate the motion of the mainstream and the two streams, which proves the reliability and effectiveness of the algorithm.