非定常超音速流动数值计算方法比较

摘要

为适用于非定常流场计算，在保证时、空二阶精度的前提下，通过引入变系数残值光顺技术，提高了四步Runge-Kutta方法的计算效率；并针对球锥简谐振动过程，数值比较Runge-Kutta多步法和“双时间法”的计算精度。%The implicit varied coefficient residual smoothing technology was introduced into the four-stage Runge-Kutta scheme to increase the computational efficiency for unsteady supersonic flow under keeping second order accuracy in time and space. The computational results achieved by four-stage Runge-Kutta scheme and dual-time method were compared through numerical simulation unsteady harmonic oscillating flow around sphere-cone.