Time evolution of the eddy viscosity in two-dimensional navier-stokes flow
Time evolution of the eddy viscosity in two-dimensional navier-stokes flow
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二维纳维-斯托克斯流中涡粘性的时间演化
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Gama
中科院分区：
文献类型：
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作者：
Chaves;Gama
采用直接数值模拟的方法，分析了二维不可压Navier-Stokes流的涡粘性随时间的演化。初始条件是涡粘性各向同性和负的。具体算例表明，Navier-Stokes动力学稳定了负涡粘效应。换句话说，在由于粘性项而发生松弛之前，该动力学将初始负涡动粘度单调地移动到正值。
The time evolution of the eddy viscosity associated with an unforced two-dimensional incompressible Navier-Stokes flow is analyzed by direct numerical simulation. The initial condition is such that the eddy viscosity is isotropic and negative. It is shown by concrete examples that the Navier-Stokes dynamics stabilizes negative eddy viscosity effects. In other words, this dynamics moves monotonically the initial negative eddy viscosity to positive values before relaxation due to viscous term occurs.