The solution error is estimated using the ZZ error estimator which is based on the recovery stress filed acquired through the MLS/NNI stress recovery scheme according to the character of the NEM.

• 针对自然单元法的特点,提出了基于MLS拟合和NNI插值的应力恢复方案; 在应力恢复的基础上采用Z-Z误差估计方法对求解误差进行了有效的估计;