$L^q$-approach to weak solutions of the Oseen flow around a rotating body

$L^q$-approach to weak solutions of the Oseen flow around a rotating body
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$L^q$-围绕旋转体的 Oseen 流弱解的方法

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发表时间:
2008
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通讯作者:
P. Penel
P. Penel
中科院分区:
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作者:
S. Kracmar;Š. Nečasová;P. Penel

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.我们考虑时间周期Oseen波绕旋转体在R3。我们证明了先验估计L q -空间的弱解的整个空间的问题的假设下,右手边的发散形式。在坐标随时间变化后,问题被简化为一个在动量方程中增加了附加项−(ω x)·u + ω u的定常Oseen方程,其中ω表示角速度。利用Littlewood-Paley分解和极大算子证明了Lq-空间中广义弱解的存在性。
. We consider the time-periodic Oseen flow around a rotating body in R 3 . We prove a priori estimates in L q -spaces of weak solutions for the whole space problem under the assumption that the right-hand side has the divergence form. After a time-dependent change of coordinates the problem is reduced to a stationary Oseen equation with the additional term − ( ω ∧ x ) · ∇ u + ω ∧ u in the equation of momentum where ω denotes the angular velocity. We prove the existence of generalized weak solutions in L q -space using Littlewood-Paley decomposition and maximal operators.