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为将格子玻尔兹曼方法(LBM)用于土木工程结构的气动弹性计算,提出了一种基于浸没边界-格子玻尔兹曼(IB-LB)方法的流固耦合算法.该算法在多松弛时间格式的格子玻尔兹曼框架下构造大涡模拟作为流场求解器;采用龙格-库塔法求解结构运动方程.为满足流固耦合面的无滑移性并提高算法的计算精度,采用一种迭代格式的浸没边界实施流固耦合面的数据交换.基于流固耦合算法编制分析程序对矩形断面的横向风振和福斯桥的颤振等气动弹性问题进行了模拟.与现有试验及数值结论的对比分析表明:本文算法可以较准确地预测矩形断面的涡振锁定风速、驰振临界风速及福斯桥的颤振临界风速.
In order to apply Lattice Boltzmann method (LBM) to aeroelastic calculation of civil engineering structures, a fluid-solid coupling algorithm based on immersed boundary-lattice Boltzmann method (IB-LB) Lagrange-Kutta method is used to solve the structural equation of motion under the lattice-Boltzmann framework in the relaxation time format. In order to satisfy the non-slip property of the fluid-solid coupling surface and to improve the calculation accuracy of the algorithm , An iterative format of immersion boundary was used to implement the data exchange of fluid-structure coupling surface.An analysis program based on the fluid-solid coupling algorithm was used to simulate the aeroelastic problems of the rectangular cross-section and the flutter of the Fossil bridge. The comparison and analysis of the experimental results and numerical results show that the proposed algorithm can predict the Vortex Locking Wind Speed, the Vibration Chi critical wind speed and the Flutter Critical Flutter wind speed of the rectangular section more accurately.