backward transport simulation

Hi,

Someone know how to make a backward advective-dispersive transport simulation.  My goal is to define the contributing area of a well using dispersive properties. Because of this, I don't want to use the backward particule tracking (advective properties only).

Thanks,

Michael,
go to "Specific Option Settings" and switch the flow field for contaminant transport to "backward". Then set a transport bc (typically a Dirichlet BC with a relative value, like 100) to the well node.
BR
Peter