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Variational Formulation for the Smooth Particle Hydrodynamics(SPH) Simulation of Fluid and Solid Problems

机译:流体和固体问题的光滑粒子流体动力学(SPH)模拟的变分公式

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The paper describes the variational formulation of Smooth Particle Hydrodynamics for both fluids and solids applications. The resulting equations treat the continuum as a Hamiltonian system of particles where the constitutive equation of the continuum is represented via an internal energy term. For solids this internal energy is derived from the deformation gradient of the mapping in terms of a hyperelastic strain energy function. In the case of fluids, the internal energy term is a function of the density. Once the internal energy terms are established the equations of motion are developed as equations of Lagrange,where the Lagrangian coordinates are the current positions of the particles. Since the energy terms areindependent of rigid body rotations and translations, this formulation ensures the preservation of physical constants of the motion such as linear and angular momentum.
机译:本文描述了适用于流体和固体应用的光滑颗粒流体动力学的变式公式。生成的方程将连续体视为粒子的哈密顿系统,其中连续体的本构方程通过内部能量项表示。对于固体,此内部能量是根据超弹性应变能函数从映射的变形梯度得出的。在流体的情况下,内部能量项是密度的函数。一旦建立了内部能量项,运动方程就发展为拉格朗日方程,其中拉格朗日坐标是粒子的当前位置。由于能量项与刚体的旋转和平移无关,因此该公式可确保保留运动的物理常数,例如线性和角动量。

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