Warning: Negative Flow Rates
between Cell pathways are treated as positive Inflows to the originating
Cell. However, negative Flow Rates to other pathways (e.g., Pipes) will
generate a Fatal Error.
In some cases, you may wish to simulate a reversal of the flow direction. For Cell Pathways, you can do this by specifying a negative Flow Rate for the advective flux. GoldSim treats a negative Outflow from a Cell as a positive Inflow to the Cell.
For all other Pathways, Flow Rates cannot be negative. Therefore, in order to simulate a reversal of flow direction, you must create two opposite advective flux links (with the flow rate defined using logic that ensures that it is either zero or positive).
Because advective mass flux links between Cells can be bi-directional (i.e., mass fluxes can move in either direction along the link), it is important to understand the sign convention used by GoldSim when displaying and using the advective mass flux outputs. Depending on how the link was created (in the Inflows tab or the Outflows tab), GoldSim always defines one of the two pathways as the "Outflow Pathway" and one of the pathways as the "Inflow Pathway". Advective mass fluxes away from the Outflow Pathway are, by convention, positive, and advective mass fluxes toward the Outflow Pathway are negative.
Warning: Negative Flow Rates
between Cell pathways are treated as positive Inflows to the originating
Cell. However, negative Flow Rates to other pathways (e.g., Pipes) will
generate a Fatal Error.