基于非结构网格的飞行器多体分离数值模拟

针对基于非结构网格方法的飞行器多体分离数值模拟中的局部网格重构问题,提出了一种基于单元相邻关系的重构区域构造方法。首先,根据单元半径比检查网格质量并标记重构单元;其次,通过网格单元的相邻关系对重构区域进行扩展;最后,通过标记非二边流形边的周围单元保证重构区域边界定义满足二边流形准则。基于该方法的某分离物投放数值实验中,成功进行了16次网格局部重构操作,重构后总体网格单元半径比的平均值达到0.71以上。计算结果和风洞实验数据的比较分析表明,数值实验精确地计算出分离物的运动轨迹和运动姿态,验证了非结构动网格重构过程的有效性。

Numerical simulation of flight vehicle multi-body separation based on unstructured mesh

To solve the problem of local remeshing in multi-body separation numerical simulation of flight vehicle with unstructured mesh, a method for the construction of local remeshing regions was proposed based on element neighbouring indices. Firstly, the mesh quality was checked by the element radius ratio and the remeshing regions were marked. Secondly, the remeshing regions were extended by the neighboring indices of mesh elements. Finally, the around elements of the non-two manifold sides were marked for ensuring the boundary definition of remeshing regions which satisfied two sides manifold criterion. The numerical experiment of a separation simulation was conducted by the proposed method. In this simulation, the local remeshing was operated successfully for 16 times, and the average of the overall remeshing element radius ratio was improved above 0.71. The calculation results and comparative analysis of the wind tunnel experimental data shows that, the trajectory and motion of the separation were calculated accurately in the numerical experiments. It is verified that the proposed unstructured remeshing process is effective.