diff --git a/docs/src/timestepping.md b/docs/src/timestepping.md index 778a5782..8ac4aed3 100644 --- a/docs/src/timestepping.md +++ b/docs/src/timestepping.md @@ -32,7 +32,7 @@ The high-wavenumber filter used in the filtered timesteppers is: For fluid equations with quadratic non-linearities it makes sense to choose a cutoff wavenumber at 2/3 of the highest wavenumber resolved in our domain, ``k_{\textrm{cutoff}} = \tfrac{2}{3} k_{\textrm{max}}`` (see discussion in [Aliasing section](@ref aliasing)). -Given the order ``p``, we calculate the coefficient ``\alpha`` so that the the filter value +Given the order ``p``, we calculate the coefficient ``\alpha`` so that the filter value that corresponds to the highest allowed wavenumber in our domain is a small value, ``\delta``, taken to be close to machine precision.