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We numerically study the Stokes eigen-modes in two dimensions on isosceles triangles with apex angle θ=π/3, π/2, and 2π/3 by using two spectral solvers, i.e., a Lagrangian collocation method with a weak formulation for the primitive variables and a Legendre–Galerkin method for the stream-function. We compute the first 6,400 Stokes eigen-modes. With 72 collocation points in each spatial dimension,...
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