标题： 显式尺度投影的分块非线性项在纳维-斯托克斯方程直接数值模拟中的应用 显示英文标题

标题： Explict-scales projections of the partitioned non-linear term in direct numerical simulation of the Navier-Stokes equation

摘要： 在本文中，我们考虑当在波数空间中引入一个截止频率尖锐的滤波器时，非线性项的内部分拆的性质。 我们看到，对于瞬时和时间积分的分拆非线性项，截止波数的选择似乎有一定的独立性。 我们还研究了亚网格项的涡粘性模型的基本思想，并发现虽然相位建模将非常差，但振幅建模可以更加成功。 显示英文摘要

摘要： In this paper we consider the properties of the internal partitions of the nonlinear term, obtained when a filter with a sharp cutoff is introduced in wavenumber space. We see what appears to be some degree of independence of the choice of the position of the cutoff wavenumber for both instantaneous and time-integrated partitioned nonlinearities. We also investigate the basic idea of an eddy-viscosity model for subgrid terms and have found that while phase modelling will be very poor, amplitude modelling can be far more successful.