Leading term at infinity of steady Navier‐Stokes flow around a rotating obstacle

Leading term at infinity of steady Navier‐Stokes flow around a rotating obstacle
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绕旋转障碍物稳定纳维斯托克斯流无穷远的首项

DOI:
10.1002/mana.200910192
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发表时间:
2011
影响因子:
1
通讯作者:
T. Hishida
T. Hishida
中科院分区:
数学3区
文献类型:
--
作者:
R. Farwig;T. Hishida

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考虑在文章amssymb empty\mathbbR ^3中以恒定角速度ω旋转的物体周围的粘性不可压缩流。使用附加到物体的坐标系,问题被简化为固定外部区域中的修改的Navier-Stokes系统。本文讨论了新系统定态解的渐近性态问题,|X| →∞。在对速度场u和边界上的净力N进行适当的小假设的情况下,我们证明了u的首项是所谓的朗道解U,这是文章amssymb empty\mathbbR ^3中定常Navier-Stokes系统的奇异解,外力kωδ0衰减为1/|X|这里amssymb空k∈\mathbbR是由N确定的合适常数,δ0是原点支持的Dirac测度.
Consider a viscous incompressible flow around a body in article amssymb empty \mathbbR^3 rotating with constant angular velocity ω. Using a coordinate system attached to the body, the problem is reduced to a modified Navier‐Stokes system in a fixed exterior domain. This paper addresses the question of the asymptotic behavior of stationary solutions to the new system as| x|→∞. Under a suitable smallness assumption on the velocity field, u, and the net force on the boundary, N, we prove that the leading term of u is the so‐called Landau solution U, a singular solution of the stationary Navier‐Stokes system in article amssymb empty \mathbbR^3 with external force kωδ0 and decaying as 1/| x|; here article amssymb empty k∈\mathbbR is a suitable constant determined by N and δ0 is the Dirac measure supported in the origin.
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期刊:
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