CAJ | 학술논문

为提高冲击波超压峰值的数值计算精度,该文根据二阶Roe格式,模拟了3种不同粗细网格条件下的点爆炸流场.基于高精度的数值计算格式,利用冲击波的发展规律求得波阵面速度,再由兰金雨贡纽方程计算得到超压峰值.并与数值模拟的直接超压峰值进行了对照讨论.结果表明随着网格加密,数值直接超压峰值不断逼近采用冲击波传播速度获得的超压峰值,而后者几乎不变.
위제고충격파초압봉치적수치계산정도,해문근거이계Roe격식,모의료3충불동조세망격조건하적점폭작류장.기우고정도적수치계산격식,이용충격파적발전규률구득파진면속도,재유란금우공뉴방정계산득도초압봉치.병여수치모의적직접초압봉치진행료대조토론.결과표명수착망격가밀,수치직접초압봉치불단핍근채용충격파전파속도획득적초압봉치,이후자궤호불변.
In order to improve the computation precision of peak overpressure of the blast wave, three point explosion cases are simulated numerically with different fine grids by using the second-order Roe scheme. Based on the numerical computational scheme of the high-precision, the blast propagation speed is calculated according to the development law of a blast wave. The indirect peak overpressure is calculated by using Rankine-Hugoniot equation and compared with the direct peak overpressure calculated by numerical simulation. The comparative result indicates that: with the increase of the mesh refinement, the direct numerical peak overpressure gradually approaches the indirect peak overpressure obtained by a blast propagation speed, while the latter is almost constant.