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arXiv 2406.14229physics.flu-dynmath-phmath.MP
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含熵的守恒型光滑粒子流体动力学方法

Approaches to conservative Smoothed Particle Hydrodynamics with entropy

Michal Pavelka, Vaclav Klika, Ondrej Kincl

AI总结:

针对传统SPH仅适用于正压流体的局限,提出多种含熵守恒型SPH方法,通过泊松约化等推导方程,保留能量守恒等特性,还扩展实现双曲型热传导建模。

摘要:

光滑粒子流体动力学(SPH)通常用于正压流体,这类流体的压力仅取决于局部质量密度。本文展示了如何将熵纳入SPH,使压力也可取决于温度,同时保持总熵的增长、总能量守恒以及SPH方程可逆部分的辛性。含熵的SPH常微分方程组通过泊松约化和拉格朗日-欧拉变换推导得出。我们提出了多种含熵SPH的实现方法,并在含间断的系统、绝热与非绝热膨胀过程,以及不采用布辛涅斯克近似的Rayleigh-Bénard对流中进行了验证。最后,本文展示了如何在SPH内建模双曲型热传导,不仅通过熵,还通过一个与热通量相关的矢量场扩展了SPH的变量。

英文摘要:

Smoothed particle hydrodynamics (SPH) is typically used for barotropic fluids, where the pressure depends only on the local mass density. Here, we show how to incorporate the entropy into the SPH, so that the pressure can also depend on the temperature, while keeping the growth of the total entropy, conservation of the total energy, and symplecticity of the reversible part of the SPH equations. The SPH system of ordinary differential equations with entropy is derived by means of the Poisson reduction and the Lagrange-Euler transformation. We present several approaches towards SPH with entropy, which are then illustrated on systems with discontinuities, on adiabatic and nonadiabatic expansion, and on the Rayleigh-Beenard convection without the Boussinesq approximation. Finally, we show how to model hyperbolic heat conduction within the SPH, extending the SPH variables with not only entropy but also a heat-flux-related vector field.

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