Abstract In this study, numerical methods are developed to simulate thermomechanical processes, taking into account both the fluid flows in the molten pool and the deformations of the solid parts. The methods are based on a new strategy of solid/fluid coupling. They allow to simulate the formation of the molten pool by taking into account the fluid flows through both effects of the surface tension (“curvature effect” and “Marangoni effect”) and the buoyancy. An ALE approach is used to follow the evolution of the free surface. The effects of the deformations in the base metal on the fluid flows in the molten pool (solid/fluid interaction) is ensured by imposing the velocities of the solid nodes during the thermo-fluid simulation. As an application, a thermo-fluid-mechanical simulation of laser welding is carried out. It is found that the solid/fluid interaction has a minor effect on simulation results.

中文翻译：

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热机械过程数值模拟中固流耦合的新策略

摘要 在这项研究中，开发了数值方法来模拟热机械过程，同时考虑到熔池中的流体流动和固体部分的变形。这些方法基于一种新的固体/流体耦合策略。它们允许通过考虑流体流过表面张力（“曲率效应”和“马兰戈尼效应”）和浮力的影响来模拟熔池的形成。ALE 方法用于跟踪自由表面的演变。通过在热流体模拟过程中施加固体节点的速度，可以确保母材变形对熔池中流体流动的影响（固体/流体相互作用）。作为一个应用，进行了激光焊接的热流体力学模拟。