节点梯度光滑有限元配点法1)
樊礼恒, 王东东, 刘宇翔, 杜洪辉

A FINITE ELEMENT COLLOCATION METHOD WITH SMOOTHED NODAL GRADIENTS1)
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图22 三维厚壁圆筒梯度解$u_{,x}^{ h} $误差对比
Fig.22 Error comparison of the gradient solution $u_{,x}^{ h} $ for the 3D hollow cylinder potential problem