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arXiv 1101.2193math.APmath-phmath.MPphysics.flu-dyn
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三维Navier-斯托克斯方程物理尺度下的能量级联和通量局域性

Energy cascades and flux locality in physical scales of the 3D Navier-Stokes equations

R. Dascaliuc, Z. Grujic

摘要:

从三维Navier-斯托克斯方程得到了R^3中总动能加压流的严格估计。边界被用来建立一个条件-涉及泰勒长度尺度和域的大小-足以存在的惯性范围和能量级联在衰减湍流(零驱动力,非增加的全球能源)。在这种情况下,得到的局部性的通量的几种表现形式。所有涉及到的尺度都是R^3中的实际物理尺度,没有做任何规律性或同质性/标度性的假设。

英文摘要:

Rigorous estimates for the total - (kinetic) energy plus pressure - flux in R^3 are obtained from the three dimensional Navier-Stokes equations. The bounds are used to establish a condition - involving Taylor length scale and the size of the domain - sufficient for existence of the inertial range and the energy cascade in decaying turbulence (zero driving force, non-increasing global energy). Several manifestations of the locality of the flux under this condition are obtained. All the scales involved are actual physical scales in R^3 and no regularity or homogeneity/scaling assumptions are made.

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