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Second order Galilean fluids and Stokes’ law

机译:二阶伽利略流体和斯托克斯定律

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We study the second derivative effects on the constitutive relations of an uncharged parity-even Galilean fluid using the null fluid framework. Null fluids are an equivalent representation of Galilean fluids in terms of a higher dimensional relativistic fluid, which makes the Galilean symmetries manifest and tractable. The analysis is based on the off-shell formalism of hydrodynamics. We use this formalism to work out a generic algorithm to obtain the constitutive relations of a Galilean fluid up to arbitrarily high derivative orders, and later specialize to second order. Finally, we study the Stokes’ law which determines the drag force on an object moving through a fluid, in presence of certain second order terms. We identify the second order transport coefficients which leave the drag force invariant.
机译:我们使用零流体框架研究了对不带电荷的奇偶性甚至伽利略流体的本构关系的二阶导数效应。空流体是高维相对论流体的伽利略流体的等效表示,这使伽利略对称性变得明显且易于处理。该分析基于流体力学的非形式化形式。我们使用这种形式主义得出通用算法,以获取伽利略流体的本构关系,直至任意高导数阶,然后再专门化为二阶。最后,我们研究了斯托克斯定律,该定律确定了存在某些二阶项时在流体中移动的物体上的阻力。我们确定使阻力不变的二阶传输系数。

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