Kreiss-Oliger Spatial Filtering

Because of high frequency numerical noise, this version also includes Kriess-Oliger spatial filtering. This filter is implemented as:

Note that, since we are using  a 3-dimensional spatial grid, this filter is taken in all three spatial dimensions. That is to say, we perform the filter, for example, first on the x-dimension, then in the y-dimension, and then in the z-dimension. (Obviously, the order is not important here.)

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