Abstract
For energetic flows there are many advantages of high order schemes over low order schemes. Here we examine a previously unknown advantage. It is commonly thought that the number of points per wavelength in order to obtain a given error in a numerical approximation depends only on runtime and the order of the approximation. Using truncation error arguments and examples we will show that it is not a constant and depends also on the wavenumber. This dependence on the numerical order and wavenumber strongly favors high order schemes for use in flows which have significant energy in the high modes such at Rayleigh–Taylor and Richtmyer–Meshkov instabilities.
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Jameson, L. High Order Schemes for Resolving Waves: Number of Points per Wavelength. Journal of Scientific Computing 15, 417–439 (2000). https://doi.org/10.1023/A:1011180613990
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DOI: https://doi.org/10.1023/A:1011180613990