Use the Boundary Groups tool to create a group of surfaces and define display properties. These surface groups can
be utilized to group boundaries as required and define specific display properties.

Use the Slice Planes tool to create derived geometry by slicing solids on a plane and defining display properties.
The result of slicing is a 2D planar face.

Use the Iso-Surfaces tool to a create a derived geometry surface with a specific constant scalar value and define
display properties. The shape of the iso-surface is dependent on domains and flow field.

Use the Streamlines tools to create derived geometry streamlines which represent particle paths in a flow field. You
have to define participating solids, seed points, and vectors from which streamlines are computed as well as the integration
direction. There are various methods to generate seed points.

Use the Probe Points tool to define a point or set of points at specific co-ordinates and probe/query results. This
is useful for verifying experimental results with simulation result.

Use the Calculate tool to create new field quantities using a python expression. The new fields can be derived from
existing fields or be completely independent of other results in the dataset.

Use the Engineering Quantities tool to simplify the calculation of values that are
commonly used during the post-processing of CFD results.

For example, the calculation of pressure drop between two surfaces in the model can
be computed by selecting Difference on the guide bar, then choosing the first collection of surfaces over
which to average the pressure, then selecting the second group of surfaces over
which to average the pressure. HyperWorks CFD Post automatically
computes the area weighted average of the selected variable (in this case pressure)
across all surfaces of each selection group, then computes the difference. The
difference is computed by subtracting the value of the second selection group from
the value of the first selection group. The resulting values are displayed in a
table that updates upon change of time step. If one of the selection groups is
derived geometry (such as a slice plane), the engineering quantity output is also
updated upon modification. The table that displays the engineering quantity output
can be displayed even while not in the Engineering Quantities tool. This is
controlled by toggling the visibility on and off in the browser.

From the Post ribbon, click the Engineering Quantities
tool.

Use the drop-down on the guide bar to select an
engineering quantity of interest.

This tool supports the following operations; Sum, Difference, Area Average,
and Mass flow rate. Sum can be used to compute the area weighted sum of a value
on a surface. For example, if the wall shear stress is an output field from the
solver, the sum over the surface will yield the viscous force. The difference
can be used to compute pressure or temperature differences. The area average
option yields the area average of a variable over a surface. The mass flow rate
option provides the ability to compute the mass flow rate through a surface
based on a velocity vector and a density field.

Select surfaces or boundary groups to consider and define the
variable/parameters in the microdialog.

Some engineering quantities require only a single selection group, such as
difference, sum, and average. Some quantities, such as mass flow rate, require
multiple inputs in order to calculate the resulting value. For mass flow rate,
an input velocity vector is required, as well as the definition of a density
field. The density can be specified as a constant through the microdialog or an existing scalar field can be used to
specify the density.

Click Calculate.

Optional: Click in the results dialog to save the values.