** Next:** newcells: Boolean
** Up:** Physical/Computational parameters
** Previous:** masscheck: Boolean
** Contents**

###

nonlinear: 0,1, or 2

Advection scheme for momentum:

- 0
- : No advection of momentum, i.e.
.
- 1
- : First-order upwind for momentum.
- 2
- : Second-order central for momentum. Note that diffusion must be present for stability. While
it is difficult to perform an exact stability analysis for the unstructured-grid equations, the 1-d
stability limitation requires that
grid Peclet number according to

where
and
,
which translates into the requirement that the horizontal diffusion be restricted to

Equivalently, the vertical diffusion is restricted by

2014-08-06