[Users] McLachlan with shift advection but centred stencils

[Roland Haas]

Hello all,

just to be sure (I read McLachlan_BSSN.m but want to be sure): it is
currently not possible to run a simulation using ML using shift
advection beta^i\partial_i but without upwinding the advection
derivatives, is it? Such an option is useful for simulations without
black holes where one can potentially safe a ghost zone by using only
centred stencils.

Yours,
Roland

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