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发表于 2011-8-8 08:02:27
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来自 日本
本帖最后由 hillyuan 于 2011-8-8 08:05 编辑
At first, 样条元无需网格,可以归入无网格方法 is not that sure. You need define a sub-volume to define a 样条. It is really a finite element. (I think they use spline-finite element to call this method).
Than consider it an a finite element, what it defers from classic displacement finite element is it uses spline interpolation(shape) function while classic method uses lagrangian or serepidient ones. Generally you can use differrent type of shape functions such as trigonometric function, although those are rarely adopted. therefore, 样条有限元 is not that special.
When using 样条有限元, you could get a higher order interpolation insider an element. It is ture that 高阶连续性使得样条元法效率要明显高于传统有限元. However, it also means computation cost. A vital drawback of 样条有限元 it introduce new node in element boundary. It makes such method to implement. In my view, it is not worthing to spend much time in this method. |
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