Immersed boundary-lattice Boltzmann method was used to study the failure of automobile door sealing strip considering fluid-structure interaction under pressure difference. Based on the actual vehicle model, a two-dimensional calculation model of simplified automobile door sealing strip was established by using immersed boundary method, and practical problems such as the equivalent sealing strip wall thickness correction, wall friction, and pressure balance holes were solved. The accuracy of the model was verified by finite element method. The unsteady pressure outside the vehicle was obtained by CFD and verified by wind tunnel experiment, which could be used as references for setting boundary conditions. In the process of studying the seal failure, by setting the average value, the fluctuation amplitude and the frequency of pressure difference, an automatic iterative program was compiled to obtain the failure situations of the seal under critical pressure difference conditions. The results show that the constant value of the unsteady pressure outside vehicle is the dominant factor, then the coupling between the unsteady pressure frequency and the sealing strip natural frequency, or the increase of the fluctuation range will aggravate seal failure.

采用浸入式边界-格子Boltzmann方法研究了考虑压差作用下流固耦合的汽车门密封条失效。基于实车模型，采用浸没边界法建立了简化的汽车门密封条二维计算模型，解决了等效密封条壁厚修正、壁面摩擦、压力平衡孔等实际问题。通过有限元法验证了模型的准确性。通过CFD获得车外非定常压力，并通过风洞实验进行验证，可作为边界条件设置的参考。在研究密封失效的过程中，通过设置压差的平均值、波动幅度和频率，编制了一个自动迭代程序，以获得临界压差条件下密封件的失效情况。结果表明，车外非定常压力的恒定值是主导因素，非定常压力频​​率与密封条固有频率的耦合，或波动幅度的增大，都会加剧密封失效。