基于混合后向微分公式时间步长的二阶Enclusion方法求解不定常Navier-斯托克斯方程
A second-order Ensemble method based on a blended backward differentiation formula timestepping scheme for time-dependent Navier-Stokes equations
摘要：
提出了一种基于混合三步向后差分公式（BDF）时间步长的二阶系综方法来计算Navier-斯托克斯方程系综.与现有的二阶系综方法相比，该方法结合了两步BDF时间步进格式和对流项的显式二阶Adams-Bashforth处理，该方法具有更高的精度，而计算成本略有增加。对该方法进行了全面的稳定性和误差分析。数值算例验证了理论结果，并证明了该方法的精度提高。
英文摘要：
We present a second-order ensemble method based on a blended three-step backward differentiation formula (BDF) timestepping scheme to compute an ensemble of Navier-Stokes equations. Compared with the only existing second-order ensemble method that combines the two-step BDF timestepping scheme and a special explicit second-order Adams-Bashforth treatment of the advection term, this method is more accurate with nominal increase in computational cost. We give comprehensive stability and error analysis for the method. Numerical examples are also provided to verify theoretical results and demonstrate the improved accuracy of the method.
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