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为了将计算渗流自由面的弃单元法应用于ANSYS软件中,对其进行了改进,即根据每次迭代计算结果,将节点全部位于自由面以上的单元均删掉,从而使得总体传导矩阵的阶数不断降低,计算效率得到提高。在计算复合单元等效渗透系数时,对复合单元进行二次细分,以减小单元尺寸对计算结果的影响。计算收敛后,对复合单元上的节点插值求出零压头点坐标,再对零压头点进行曲线拟合或曲面拟合即得自由面。基于该方法,利用ANSYS的APDL语言编制了渗流自由面分析程序,并进行了实例分析。结果表明,提出的改进方法结构简单、精度较高。
In order to apply the disposable cell method to calculate the seepage free surface in the ANSYS software, it is improved that according to the calculation results of each iteration, all the cells whose nodes are located above the free surface are deleted, so that the order of the total conduction matrix The number of continuously reduced, the calculation efficiency is improved. In the calculation of the equivalent permeability coefficient of the composite unit, the composite unit is subdivided to reduce the influence of the unit size on the calculation result. After the calculation is converged, the coordinates of the zero pressure head point are obtained by interpolating the nodes on the composite unit, and then the free surface is obtained by curve fitting or surface fitting of the zero pressure head point. Based on this method, the APDL language of ANSYS was used to prepare the seepage free surface analysis program, and an example was given. The results show that the proposed method is simple in structure and high in accuracy.