Analysis of stretched grids as buffer zones in simulations of wave propagation

作者：Kreiss G^*; Krank B; Efraimsson G

来源：Applied Numerical Mathematics, 2016, 107: 1-17.

DOI：10.1016/j.apnum.2016.04.008

• Non-reflecting boundary conditions
• Buffer zones
• Wave propagation

A zone of increasingly stretched grid is a robust and easy-to-use way to avoid unwanted reflections at artificial boundaries in wave propagating simulations. In such a buffer zone there are two main damping mechanisms, dissipation and under-resolution that turns a traveling wave into an evanescent wave. We present analysis in one and two space dimensions showing that evanescent decay through under-resolution is a very efficient way to damp waves. The analysis is supported by numerical computations.

• 出版日期2016-9