Solving the linear inviscid shallow water equations in one dimension, with variable depth, using a recursion formula

Solving the linear inviscid shallow water equations in one dimension, with variable depth, using a recursion formula
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使用递归公式求解可变深度的一维线性无粘浅水方程

DOI:
10.1088/1361-6404/aa864b
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发表时间:
2017
影响因子:
0.7
通讯作者:
Castillo, J
Castillo, J
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Hernandez-Walls, R;Martín-Atienza, B;Salinas-Matus, M;Castillo, J

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在用有限差分法求解一维变深度线性无粘浅水方程时,必须求解一个三对角方程组。在这里,我们提出了一种比通常使用的数值方法更有效的方法,用递推公式来解这个三对角线方程组。我们用一个例子来说明这种方法,在这个例子中,我们求解一个矩形通道来找到共振模式。我们的数值解与解析解非常吻合。这种新方法易于本科生使用和理解,因此可以在数值方法、线性代数或微分方程等本科课程中实现。
When solving the linear inviscid shallow water equations with variable depth in one dimension using finite differences, a tridiagonal system of equations must be solved. Here we present an approach, which is more efficient than the commonly used numerical method, to solve this tridiagonal system of equations using a recursion formula. We illustrate this approach with an example in which we solve for a rectangular channel to find the resonance modes. Our numerical solution agrees very well with the analytical solution. This new method is easy to use and understand by undergraduate students, so it can be implemented in undergraduate courses such as Numerical Methods, Lineal Algebra or Differential Equations.
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