Euler and Navier–Stokes equations in a new time-dependent helically symmetric system: derivation of the fundamental system and new conservation laws
Euler and Navier–Stokes equations in a new time-dependent helically symmetric system: derivation of the fundamental system and new conservation laws
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新的瞬态螺旋对称系统中的欧拉和纳维斯托克斯方程:基本系统和新守恒定律的推导
DOI:
10.1017/jfm.2017.74
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发表时间:
2017
影响因子:
3.7
通讯作者:
Oberlack
中科院分区:
文献类型:
--
作者:
Dierkes;Oberlack
The present contribution is a significant extension of the work by Kelbin et al. (J. Fluid Mech., vol. 721, 2013, pp. 340–366) as a new time-dependent helical coordinate system has been introduced. For this, Lie symmetry methods have been employed such that the spatial dependence of the originally three independent variables is reduced by one and the remaining variables are: the cylindrical radius , which may be varied arbitrarily and which is explicitly contained in all of the latter equations. This has been conducted both for primitive variables as well as for the vorticity formulation. Hence a significantly extended set of helically invariant flows may be considered, which may be altered by an external time-dependent strain along the axis of the helix. Finally, we sought new conservation laws which can be found from the helically invariant Euler and Navier–Stokes equations derived herein. Most of these new conservation laws are considerable extensions of existing conservation laws for helical flows at a constant pitch. Interestingly enough, certain classical conservation laws do not admit extensions in the new time-dependent coordinate system.
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影响因子:
4.6
作者:
D. Schnack;E. Caramana;R. Nebel
通讯作者:
D. Schnack;E. Caramana;R. Nebel
影响因子:
4.6
作者:
John L. Johnson;C. Oberman;R. Kulsrud;E. Frieman
通讯作者:
E. Frieman
影响因子:
3.7
作者:
Olga Kelbin;A. Cheviakov;M. Oberlack
通讯作者:
M. Oberlack
DOI:
10.1103/physreve.62.8616
发表时间:
2000
期刊:
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
影响因子:
--
作者:
Bogoyavlenskij
通讯作者:
Bogoyavlenskij
影响因子:
3.7
作者:
D. Dritschel
通讯作者:
D. Dritschel