纯隐格式的混合有限分析法在广雅桥水流数值模拟中的应用

分别建立柳州市柳江河道大范围河段和拟建广雅桥局部范围曲线坐标系下的二维水流数学模型,并采用纯隐格式的混合有限分析法来离散和求解该数学模型,将常用的干湿网格判别标准与冻结法结合起来模拟计算河道中的浅滩。所建立的大范围柳州市柳江河道二维水动力数学模型计算成果一方面用于验证,另一方面为广雅桥局部二维水动力数学模型提供初始和边界条件。结果表明,广雅桥的建设对局部河道的壅水和水流流态存在一定的影响,同时也证实了纯隐格式的混合有限分析法在工程实际应用中的准确性和有效性。

Application of implicit scheme hybrid finite analytic method in numerical simulation of flow effect by Guangya Bridge

Two-dimensional mathematical models in the curvilinear coordinates were established respectively for large-scale reach and local reach of Liujiang River in Liuzhou City to simulate flow effect by Guangya Bridge.An implicit scheme hybrid finite analytic method is employed to solve the two-dimensional models.The method of freezing and the standard of distinguishing dry-flood grid nodes were used together to deal with beaches in the computational area.The results of the two-dimensional mathematical model for large-scale reach of Liujiang River were used for validation and provided the initial and boundary conditions for the two-dimensional mathematical model for the flow effect in the local reach of Liujiang River by Guangya Bridge.The analyses show that the existence of Guangya Bridge has certain influences on the dammed water and flow regime in adjacentlocal reach,and the accuracy and efficiency of applying the implicit scheme hybrid finite analytic method in actual projects are validated.