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从直接模拟蒙特卡罗仿真DSMC方法的实现途径出发,经过分析推导,给出了一种在考虑分子转动能、振动能等热力学非平衡状态下统计求解绝热壁温的DSMC抽样方法。然后采用锥体外形的算例验证,分析了该方法在实现绝热壁条件时的统计误差。计算结果表明,此种方法能够有效地实现DSMC方法壁面处的绝热壁条件,随着采样步数的增加,其边界条件实现时的统计误差不断降低,该方法收敛后的统计误差可降至0.5%,能够满足工程要求。
Starting from the way of simulating Monte Carlo simulation DSMC method directly, a DSMC sampling method is proposed to calculate the adiabatic wall temperature under the thermodynamic unbalanced state such as molecular rotational energy and vibration energy. Then the example of cone shape is used to verify and analyze the statistical error of this method when it comes to adiabatic wall condition. The results show that this method can effectively achieve the thermal insulation wall conditions at the wall of DSMC method. As the number of sampling steps increases, the statistical error of the boundary conditions decreases. The statistical error after the convergence can be reduced to 0.5 %, Able to meet the project requirements.