# Tutorial 11: MultiCase Tutorial

Purpose/Objective

This exercise will walk the user through setting up a multicase run. The user will learn how to:

• Use Flow Simulator Multicase creator

Step 1: Objective

• The user will start with the existing water piping model and set up a multicase run to investigate the effects on flow caused by changes in pressure of an upstream chamber

Figure 1.01: Chamber and element of focus

1. Browse to model location and select open (Water_piping.flo)

Step 3: Building Model

1. Go to Probabilistic & DOE → Multicase Creator

2. Click the inlet boundary plenum (this will populate the Properties tab)
3. Select Static Pressure from the list
• In the box next to the Add case button, enter 11 and click the Add case button

Figure 1.04: Setting up Multicase inputs

4. The range of inlet pressures for this plenum will be from 20 psi to 30 psi. Fill in the empty case boxes with pressures start from 20 psi and increasing in increments of 1 psi

Figure 1.05: Inlet pressure inputs

5. Save the multicase file and close the multicase creator
6. In the solution Panel, select Multiple Cases and click Multi-case Settings
• Under Multi-case Import file, click browse and select the multicase file created earlier and click OK

Figure 1.06: Set up to run multicase

7. In the solution Panel, Initialize Model, accept values, and Run Flow Simulator

Step 4: Post Process Model

1. Go to PostProcessing → Results Table
2. Under Results, click , select the Chambers radial button and enter the Inlet Chamber ID
3. Select Append and go to the Inputs tab
• Choose Static Pressure
4. Select and choose the element downstream of the inlet chamber
5. Select Append and go to the Results tab
• Choose Total Flow

Figure 1.07: Results Table showing pressure and flow

6. Highlighting two columns and clicking show plot will create a line a plot of both values and also a “Scatter Plot” button. Clicking that button will create a plot seen in Figure 1.08

Figure 1.08: Scatter plot of static pressure vs flow rate

7. Figure 1.08 shows the impact on flow rate as a result of changing inlet pressure of the system