CAJ | 학술논문

理论分析了插值方法引入误差的原因,提出一种利用时间推进方法和移动网格技术实现网格之间流场信息传递的思想,并构造计算方法.在介绍新的信息传递算法原理的基础上,根据三维情况下传递过程需要满足的时间推进步长稳定性条件,推导出最小推进步数的要求.最后,通过对激波诱导物体运动的非定常流动模拟,比较了信息传递算法和线性插值、加权最小二乘插值方法,计算结果表明,与插值方法相比,信息传递过程没有引入误差,能有效抑制非物理振荡,保持流场计算精度.
이론분석료삽치방법인입오차적원인,제출일충이용시간추진방법화이동망격기술실현망격지간류장신식전체적사상,병구조계산방법.재개소신적신식전체산법원리적기출상,근거삼유정황하전체과정수요만족적시간추진보장은정성조건,추도출최소추진보수적요구.최후,통과대격파유도물체운동적비정상류동모의,비교료신식전체산법화선성삽치、가권최소이승삽치방법,계산결과표명,여삽치방법상비,신식전체과정몰유인입오차,능유효억제비물리진탕,보지류장계산정도.
The reason for introducing computational errors by interpolation is analyzed theoretically, and then a new method for transferring flow information among meshes is presented, which integrated time marc-hing method and dynamic grids technology. Based on the principle of this method, the stability condition is developed in the case of three dimensions, and the minimum number of time steps is given. Moreover, the present method is compared with linear and weighted least-squares interpolation in an unsteady case of shock induced movement of a rigid body. The results demonstrated that the present method is effective in preven-ting spurious oscillations, without any loss in accuracy, and thus maintains higher accuracy in fluid computa-tion.