advection

structure containing the basic arrays associated with the advection terms appearing in the advection equation for each coordinate

do all the work needed to update f(coord) at a single value of other coords

calculate the explicit advection terms on the rhs of the equation; i.e., -Δt⋅δv⋅f'

create arrays needed to compute the advection term(s) for a 1D problem

create arrays needed to compute the advection term(s)

calculate the factor appearing in front of f' in the advection term at time level n in the frame moving with the approximate characteristic

update the righthand side of the equation to account for 1d advection in this coordinate