SPH在热喷涂冲击建模中的应用与基准测试
Application and Benchmark of SPH for Modeling the Impact in Thermal Spraying
AI总结：
本文提出3D SPH模型结合半隐式Enthalpy-Porosity方法模拟热喷涂颗粒冲击与凝固过程，通过隐式校正提升性能，并与Ansys Fluent的VOF方法基准对比，证明SPH能准确高效解决该自由表面问题。
摘要：
热喷涂涂层的性能（如耐久性或热导率）取决于其微观结构，而微观结构又直接与颗粒冲击过程相关。为了模拟这一过程，我们提出了一个3D Smoothed Particle Hydrodynamics (SPH) 模型，该模型将熔融液滴表示为不可压缩流体，同时在凝固过程中对糊状区应用半隐式 Enthalpy-Porosity 方法。此外，我们基于已知方法提出了一种用于 SPH 模拟的隐式校正，从中可以观察到性能和模拟稳定性的提升。我们将我们的 SPH 方法应用于 Al$_2$O$_3$ 液滴在自由滑移基底上的冲击与凝固，并在考虑相同物理效应的情况下，将我们的方法与使用 Volume of Fluid (VOF) 方法的商业软件 Ansys Fluent 进行了严格的定量比较。我们对结果进行了深入评估，并讨论了这两种方法在热喷涂沉积模拟中的适用性。我们表明，SPH 是一种能够准确高效地解决这一自由表面问题的出色方法。
英文摘要：
The properties of a thermally sprayed coating, such as its durability or thermal conductivity depend on its microstructure, which is in turn directly related to the particle impact process. To simulate this process we present a 3D Smoothed Particle Hydrodynamics (SPH) model, which represents the molten droplet as an incompressible fluid, while a semi-implicit Enthalpy-Porosity method is applied for the mushy zone during solidification. In addition, we present an implicit correction for SPH simulations, based on well known approaches, from which we can observe improved performance and simulation stability. We apply our SPH method to the impact and solidification of Al$_2$O$_3$ droplets onto a free slip substrate and perform a rigorous quantitative comparison of our method with the commercial software Ansys Fluent using the Volume of Fluid (VOF) approach, while taking identical physical effects into consideration. The results are evaluated in depth and we discuss the applicability of either method for the simulation of thermal spray deposition. We show that SPH is an excellent method for solving this free surface problem accurately and efficiently.
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