The Filters panel contains all the filtering tools we need to post-process the results and they can be added by clicking the ‘Add filter’ button.

 

The post-processing stage mostly consists of filters that can help us visualize and analyze the behaviour of our model. See below a description and instructions on how to use each filter:

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Figure 8: Filters type

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**These filters can be combined with the colouring of the parts or with each other. Each filter will have its own visibility toggle to hide or visualize it.

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5.2.1 Cutting Planes

• Using the sliding bar to set the position of the cutting plane along the selected axis or by defining the coordinates by clicking on ‘Position’. 

• Orientation sets the orientation of the cutting plane by determining the normal direction.

• Coloruing defines what parameter to visualize.

• ‘Vectors’ toggles the visibility of vectors. You can change the colours of the vectors with a solid color or with the magnitude. The size and spacing of the vectors can also be configured for accurate visualization. The size of the vectors can also be limited by defining the range of clamping. The vectors can also be filtered depending on the vector that is visualized.

 

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Figure 9: Example Cutting Plane for Velocity

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5.2.2 Iso-Surfaces

Iso Surface isolates regions in the model which match a given variable value. They can also be useful in identifying critical areas such as the maximum and the minimum values. If the user wants to know where the Velocity/Pressure is exactly a value, Iso Surface is the choice. You can create an iso-surface in the settings. Select the flow quantity to be displayed from the list besides the Iso scalar, and set the Iso value. The colouring is set to the specific variable.

 

 

 

 

 

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Figure 10: Example Iso Surface for pressure

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5.2.3 Iso-Volumes

Similar to the Iso Surface filter, the Iso Volume filter isolates volume regions in the model for a certain range. In the settings below, users can select Velocity/Pressure... to be visualized and set the Iso value range(minimum - maximum). This will display areas where the pressure is less than or equal to the maximum value.

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‘Vectors’ can also be shown on these volumes and the settings are similar to those for Iso surfaces.

Iso Volumes can help find regions where a quantity is over/below a certain threshold or requirement. Similarly, Iso volumes can be used to isolate areas where cavitation occurs by changing the Max. iso value to the lowest allowable pressure before cavitation occurs.

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Figure 11: Example Iso Volume for Velocity

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5.2.4 Particle Traces

Particle Traces are similar to a dye that is injected into the flow and is often used to visualize the flow movement. 

• Pick the entry position for your particle trace by clicking the icon besides Pick position. 

• Determine how many particle traces horizontally and vertically by sliding the toggle or entering a number beside #Seeds horizontally and #Seeds vertically. The default values will suffice.

• Determine the distance between each streamline by configuring the Spacing. The default values can be used for now.

 

Streamlines can be insightful in observing the fluid flow from a certain location – it can either be defined on a specific face of the model or on a cutting plane.

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Figure 12: Particle Trace

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