The form for the jet and plume boundary condition (Figure 1) features the Current Boundary Cell and Boundary Group Conditions frames similar to the Flow Boundary Conditions form. One difference is that in Current Boundary Cell for Jet/Plume, the user must define an upstream cell and a downstream cell simultaneously. In the Jet/Plume Type drop-down menu the user specifies the flow data of a jet plume boundary to link to with the time series options. These options include by-passing (ICAL=0), using a flow time series (QSER, ICAL=1), and using a withdrawal return time series (W/R, ICAL=2). The Flow Series and W/R Series in Flow Assignment for Cell is enabled according to the Jet/Plume type selected. The Diagnostics drop-down allows the user to select from display jet/plume stop conditions, and save jet/plume growth details. The Stop Plume Growth Option allows the simulation to stop after a certain number of elements, when the plume centreline penetrates, or when the plume edge penetrates. From release of EEMS11.2 WQ constituents may also be added to the plume.
In the Diffuser Port Settings frame the user may specify the settings for each discharge cell including the number of ports, the elevation, and the diameters of the port outlets, as well as the horizontal (azimuth) and vertical (altitude) angles. It should be noted that the flow in the QSER file is multiplied times the number of ports for the total flow for that BC cell. So for example, if a user has 10 ports with each port having a time series of 0.15 cms assigned for the jet, then the total flow is 10 * 0.15 cms = 1.5 cms.
The Maximum Number of Elements is mainly used for plume computation termination purposes. This means that plume growth will always stop when the Maximum Number of Elements is exceeded, which is before reaching the neutral buoyancy level or the plume reaches the surface (plume density less than ambient) or the bottom (plume density greater than ambient). It is important not to set this value too small as it will cause the computations to cease before the plume reaches the stop growth option.
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An adjustment factor for the Froude Number may also be set.
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Figure 1. Jet /Plume Boundary Condition form.
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