激光加热金属板流固耦合数值模拟

 数值模拟研究了气流和激光辐照双重作用下的金属平板温度场。流体控制方程为3维雷诺平均N-S方程，固体控制方程为能量方程，湍流粘性系数求解使用k-ε两方程模型。采用流固耦合计算方法，使用动网格模型模拟气流的“冲刷效应”，较完整地模拟了激光辐照金属材料的物理变化过程，计算得到金属平板的温度分布及流场分布。结果表明:在较低气流速度及激光功率下，气流的冷却效应占主导地位；当气流速度和激光功率上升到一定程度后，气流的“冲刷效应”和冷却效应共同决定金属平板的温度分布。

Numerical simulation of metal plates under laser irradiation based on fluid-solid coupling

The thermal field of metal plates in flows under laser irradiation has been computed. The flow was governed by the 3-D Reynolds averaged Navier-Stokes equations and the solid was governed by the energy equation. The k-ε turbulence model was used for turbulence simulation. Thus by using dynamic mesh model to simulate the flow’s “wash out” effect, the physical process of laser ablation was described commendably with fluid-solid coupling method. The results of thermal field and flow field show that the flow just cools the metal plates when the flow velocity and laser power are low. With the flow velocity and laser power getting higher, the flow’s “wash out” effect becomes more important for the thermal field of metal plates.