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dt:

Time step. Assuming , stability is limited by

where is the internal wave speed, is the relevant Courant number, and
is the minimum Voronoi distance. Note that this assumes first-order upwind is used
for advection of momentum. If central-differencing is used, stability is further
constrained by the grid Peclet number (see Section 7.1.51 for details).

2014-08-06