Abstract:When failure happens in composite materials, cracks typically cause serious deterioration of mechanical performance and safety. Therefore, occurrence, location, and size of cracks need to be predicted and evaluated before they cause fatal accidents. In this paper, computational formulations are presented for a poroelastic and a viscoelastic composite. The formulations are based on a phase change description and Finite Difference Method (FDM). Numerical simulations and experiments are conducted to verify the ability and reliability of the formulations. Both formulations are integrated into a user-friendly multi-physics interface, which is called the Virtual Ansys Engine. Thus, users can select different physical models, refine all the parameters and execute simulations at any time.
Abstract:Computational fluid dynamics (CFD) is an important numerical method in the whole fields of fluid dynamics, which is widely used for analysis of turbulent mixing processes, flow characteristics of cracks, and jet performances, etc. However, the high computation requirement restricts its application. In this paper, a new parallel CFD solution algorithm combining the Synthetic Auxiliary Field Method and the Horizontal Instability Theory is proposed to get a good balance between accuracy and efficiency. The computational efficiency of the parallel simulations are increased by roughly two orders by a multithread computing framework based on horizontal decomposition. The stable calculations are performed by the Horizontal Instability Theory (HIT), and alternative calculations should be performed by the Synthetic Auxiliary Field Method (SAFM) to get a better accuracy in the virtual experiments. The accuracy and efficiency of the new algorithm are verified by parallel simulations of turbulent channel flows, turbulent cavity flows, and turbulent jet performance. The results show that the CFD calculations are extremely effective and efficient. The parallelism of the speedup is between 100-300. The parallel efficiency is between 98.3%-100.0% and the speedup is between 1.08-113.0. d2c66b5586