Creating and Editing Advective Mass Flux Links

To create an advective mass flux link between two pathways in GoldSim, you must specify two things:

• The flow rate of the medium. This is specified in terms of volume/time for fluids and mass/time for solids.

GoldSim provides two ways to create an advective flux link between two pathways:

The Outflows tab is used to create advective flux links from the current pathway to other pathways in the model. The Inflows tab is used to create advective flux links to the current pathway from other pathways in the model.

The two dialogs are almost identical in appearance. The Outflows tab is shown below:

To create a new Outflow (a mass flux link from the current pathway to another pathway), do the following:

3. Press the Add Outflow button. This will bring up a browser showing all of the other pathways (or Containers with pathways) in the model.

5. GoldSim will then display a dialog for selecting the medium involved in the mass flux link:

If you change your mind or have selected the wrong pathway, press the Select… button to change the pathway.

The second field in this dialog is a drop list containing the Reference Fluid in the Outflow ("from") pathway, as well as any other media that the two pathways have in common.

Note: The Medium drop list will also include options for “Direct transfer rate”, "Precipitate transfer rate" and "Fraction of inflows". If one of these are selected, the flux link becomes a special purpose flux link rather than an advective flux link.

The third field in this dialog specifies the Link Type. If you are connecting two Cells, this will default to Coupled. If the link involves any other type of pathway, it will default to Normal. In most cases, you will not need to change the field and can accept the default.

6. You will then be returned to the Outflows tab. Move your cursor to the Properties of Selected Outflow section and enter the Flow Rate. (The flow rate will be defaulted to 0 m3/s for fluids and 0 kg/s for solids.

7. If you wish to save the mass flux Final Values or Time Histories for the link, select one or both of the checkboxes.

After an outflow is created, you can always change the properties of the outflow (i.e., the flow rate and whether or not results are to be saved) by selecting the outflow in the top of the dialog (by clicking on the appropriate row in the List of Outflows) and editing the properties in the lower section of the dialog (Properties of Selected Outflow).

The Inflows and Outflows tab only displays the pathway name, and does not indicate where the pathway exists in the model. If, however, you hold your cursor over a pathway in the list, a tooltip displays the full containment path for the pathway.

Note: Once an advective mass flux link is created, you cannot change the medium which is involved. The only way to change the medium is to delete the link and recreate it.

An outflow is deleted by selecting the outflow in the top of the dialog (by clicking on the appropriate row in the List of Outflows) and pressing the Delete Outflow button.

Note: To assist you in maintaining a flow balance for your model, GoldSim lists the total outflow rate of the Reference Fluid (the sum of the expected values of the outflows) at the bottom of the Outflows tab.

The Inflows tab is used to create advective flux links to the current pathway from other pathways in the model. The manner in which inflows are created, edited and deleted is identical to that for outflows, and the two tabs are essentially identical in appearance.

Note that when you create a mass flux link using the Outflows tab of one pathway, the link automatically appears in the Inflows tab of the linked pathway. The properties of the mass flux link can be edited from either location.