Running a transient systems simulation

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InfoWorks WS Pro includes a transient systems (TS) simulation option

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that can indicate potential critical areas within the network due to transient pressures.

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The transient advisor results provide a qualitative estimate of the potential issues that you may wish to investigate further.

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It is important to note that the results of a transient analysis are difficult to interpret,

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so you may wish to consult someone with expertise in this area.

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To begin, open the network.

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From the Model Group window, expand the TS Model group.

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Open the TS Network and TS Control by double-clicking the TS Network, or by dragging and dropping it into the main window.

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Next, set the properties of the pump.

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In this example, you are representing a 5-second pump trip and need to account for the non-return nature of the pump station.

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Use the Find Network Objects tool to locate the pump station with asset ID “KCH2PMP”.

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Then, in the Tools toolbar, click Properties to open the Properties window for the pump.

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Scroll down to Transient and click the plus sign (+)to expand the Transient Page.

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Select the Enable Surge checkbox, then expand the Pump Change drop-down and select Trip.

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Set the Trip Time to 5 seconds.

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Next, set the NRV (non-return valve) Diameter to 50.8mm, set the Loss Coefficient to 0, and enable Do Not Reopen the NRV.

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Finally, set the NRV Response Time to 0.1 seconds.

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Commit your changes to the database.

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To run the TS simulation, first, create a new run.

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Right-click Model Group and select New> Run Group.

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Click OK, and then right-click the new Run Group and select New > Run.

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In the Schedule Hydraulic Run dialog, enter “TS-Pump Trip” in the Title field.

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From the Model Group window, drag InfoWorks TS Network, InfoWorks TS Control,

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and Average Demand and drop them into the Network, Control, and Demand Diagram boxes.

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Also, select the box next to Experimental.

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In the Run Type group box, expand the drop-down and select InfoWorks TS to open the InfoWorks TS Options dialog.

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Set the Transient simulation start to 2 May 2022 at 06:00 and the Duration(s) to 30 seconds.

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Leave the remaining options as the defaults and click OK.

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Back in the Schedule Hydraulic Run dialog, at the bottom of the Run Parameters group box,

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expand the drop-down and select Simulation Options.

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Click the Options button next to it to open the Simulation Options window.

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In the Description column, locate the Advise on Hydraulic Transients option.

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In the same row, in the Default column, deselect the checkbox so that the Value column shows Yes.

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Click OK to close the window.

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Click Save, ensure that there are no ERRORS in the Parameters Setup Messages box, and then click Run.