Inputs and Outputs Associated with Diffusive Mass Flux Links

When a diffusive mass flux link is created, GoldSim creates several new inputs and outputs on the two linked pathways which subsequently appear in the browser view and interfaces for these pathways.

• GoldSim creates a new output named Medium1_to_Medium2_in_Path2, where Medium1 is the name of the fluid on the Outflux side of the link, Medium2 is the name of the fluid on the Influx side of the link, and Path2 is the name of the linked pathway (the Influx Pathway). For example, if Cell1 was linked to Cell2 via a diffusive link in which Water was the fluid on the Outflux side and Air was the fluid on the Influx side, GoldSim would create a new output on the Cell1 pathway called Water_to_Air_in_Cell2. Like all GoldSim outputs, when the output appears in an expression, the name of the element is included prior to the output name (Cell1.Water_to_Air_in_Cell2). This output represents the mass flux itself, and is a vector by species with dimension of mass/time.

Note: Although this output is referred to as a “flux”, it technically is a mass rate, not a flux (since fluxes have dimensions of mass/time/area). The term “flux” is used here for convenience.

• GoldSim creates two new inputs named Length in Path1 and Length in Path2, where Path1 is the Outflux pathway, and Path2 is the Influx pathway. These are the thicknesses of the diffusive layer on either side of the link.

• GoldSim creates an additional new input named Area. This is the diffusive area for the link.

These new items are organized under a "folder" within the browser view of the element called Diffusive Outfluxes:

• GoldSim creates a new input named Medium2_from_Medium1_in_Path1, where Medium1 is the name of the fluid on the Outflux side of the link, Medium2 is the name of the fluid on the Influx side of the link, and Path1 is the name of the linked pathway (the Outflux Pathway). For example, if Cell1 was linked to Cell2 via a diffusive link in which Water was the fluid on the Outflux side and Air was the fluid on the Influx side, GoldSim would create a new input on the Cell2 pathway (the Influx Pathway) called Air_from_Water_in_Cell1.

This item is placed in a Diffusive Influxes "folder" within the browser view of the element:

These new items in the browser views of the pathways are useful because they can be used in conjunction with the Link Cursor to create links. For example, rather than editing the diffusive area in the link using the editing dialog, you could create a link to Area using the Link Cursor. Similarly, you could link the mass flux output itself into an Expression element, a Sum element or an Extrema element.

Note: If you create multiple diffusive fluxes between the same two Cells, GoldSim will append the letter “c” and a number to the end of the input and output names. For example, if a second diffusive flux was added from Cell1 to Cell2, the output on Cell1 would be named “Water_to_Air_in Cell2c2” and the input on the Cell2 would be “Air_from_Water_in_Cell1c2”.