Accuracy and efficiency of a moving-zone method in the time-domain simulation

A moving zone approach is developed to overcome the barrier of the computing power required for a large, single-domain time-domain simulation for possible long-range acoustic propagation. This concept uses a moving computational domain that follows an acoustic wave. The size and interval of motion of the domain are problem dependent. In this study, an Euler-type moving domain in a stationary coordinate frame is investigated. Size effects, resolution requirement, moving-domain intervals, and boundary conditions for the moving domain are considered. The results are compared and verified with both analytical solutions and results from the single large-domain simulation. Perfectly-matched layers are employed at the free-space boundary in the moving domain.