Analytical Prediction of Reflection Coefficients for Wave Absorbing Layers
Analytical Prediction of Reflection Coefficients for Wave Absorbing Layers
复制标题
DOI：
10.1016/j.oceaneng.2017.10.009
复制
发表时间：
2017-05
期刊：
影响因子：
--
通讯作者：
Robinson Peri'c;M. Abdel‐Maksoud
中科院分区：
文献类型：
--
作者：
Robinson Peri'c;M. Abdel‐Maksoud
在自由表面波的流动模拟中，在域边界处发生的不需要的波反射可以通过在边界附近应用源项来阻尼波来最小化。这种方法的例子有吸收层、阻尼区、施力区、松弛区和海绵层。这些方法的一个问题是波阻尼的有效性取决于源项函数中的参数，这些参数取决于情况并且必须根据波进行调整。本文提出了一种理论，可以分析预测反射系数，并可用于在运行模拟之前优化选择源项参数。该理论以通用形式给出，因此它适用于许多现有的实现。它根据规则自由表面波的基于有限体积的流动模拟的结果进行了验证，并发现对于实际目的具有令人满意的精度。
Undesired wave reflections, which occur at domain boundaries in flow simulations with free-surface waves, can be minimized by applying source terms in the vicinity of the boundary to damp the waves. Examples of such approaches are absorbing layers, damping zones, forcing zones, relaxation zones and sponge layers. A problem with these approaches is that the effectivity of the wave damping depends on the parameters in the source term functions, which are case-dependent and must be adjusted to the wave. The present paper presents a theory which analytically predicts the reflection coefficients and which can be used to optimally select the source term parameters before running the simulation. The theory is given in a general form so that it is applicable to many existing implementations. It is validated against results from finite-volume-based flow simulations of regular free-surface waves and found to be of satisfactory accuracy for practical purposes.