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Plots

This section shows some of the common plots used in the ball valve simulation. The steps to create the plots are:

1. Click Load Results in the Simulation Panel.
2. Select the result file ballvalve_model_0400.sres in the ensuing Load Results dialog box, click Open.

Mass Flux

The mass balance is monitored with the mass flux plots.

1. Select ballvalve_inlet and ballvalve_outlet under Boundaries in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Mass Flux from the Flow list.
4. Click Plot Selected Variables icon.
5. Click Plot Property icon, the Plot Property dialog box opens. Enable Moving Average and enter 100. Click OK.
6. Click Combine Entity Data into a Single Curve to obtain the net mass flux.

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Note:  The moving average is used in transient simulations to obtain the average values of a variable in a sampling interval, over the entire simulation time.To plot the moving average, click Click for Variable List icon in Plot Property dialog box and enable Moving Average. The value for the Moving Average input is the number of preceding time steps (sampling interval) for calculating the average.

Valve Displacement

To plot the displacement of the valve:

1. Click Add XY-Plot icon in the Toolbar.
2. Select Translation (1 DOF) in the Model Panel.
3. Click Click for Variable List icon in the Plot Panel, select Displacement from the Translation (1 DOF) list.
4. Click Plot Selected Variables icon.

Figure 6.630 - Valve Displacement plot

Pressure

The pressure is plotted at the monitoring points as follows:

1. Select highpressure_point and lowpressure_point under Points in the Geometric Entities Panel.
2. Click Add XY-Plot icon in the Toolbar.
3. Click Click for Variable List icon in the Plot Panel, select Pressure from the Flow list.
4. Click Plot Selected Variables icon.

Figure 6.631 - Pressure plots

Forces

The forces acting on the ball valve are plotted as follows:

1. Click Add XY-Plot icon in the Toolbar.
2. Select Translation (1 DOF) in the Model Panel.
3. Click Click for Variable List icon in the Plot Panel. Select Fluid Force from the Translation (1 DOF) list.
4. Click Plot Selected Variables icon. Similarly plot Spring Force and Net Force.

Figure 6.632 - Forces on the valve