To obtain a report for selected surfaces of the area or mass flow rate or the integral, flow rate, sum, facet maximum, facet minimum, vertex maximum, vertex minimum, or mass-, area-, facet-, or vertex-averaged quantity of a specified field variable, use the
Surface Integrals panel (Figure
Figure 29.5.1: The
Surface Integrals Panel
The steps for generating the report are as follows:
Specify which type of report you are interested in by selecting
Mass Flow Rate,
Vertex Minimum, or
Vertex Maximum in the
Report Type drop-down list.
If you are generating a report of area or mass flow rate, skip to the next step. Otherwise, use the
Field Variable drop-down lists to select the field variable to be used in the surface integrations. First, select the desired category in the upper drop-down list. You can then select a related quantity from the lower list. (See Chapter
30 for an explanation of the variables in the list.)
Surfaces list, choose the surface(s) on which to perform the surface integration.
If you want to select several surfaces of the same type, you can select that type in the
Surface Types list instead. All of the surfaces of that type will be selected automatically in the
Surfaces list (or deselected, if they are all selected already).
Another shortcut is to specify a
Surface Name Pattern and click
Match to select surfaces with names that match the specified pattern. For example, if you specify
wall*, all surfaces whose names begin with
wall-top) will be selected automatically. If they are all selected already, they will be deselected. If you specify
wall?, all surfaces whose names consist of
wall followed by a single character will be selected (or deselected, if they are all selected already).
Click on the
Compute button. Depending on the type of report you have selected, the label for the result will change to
Mass Flow Rate,
Sum of Facet Values,
Average of Facet Values,
Minimum of Facet Values,
Maximum of Facet Values,
Average of Surface Vertex Values,
Minimum of Vertex Values, or
Maximum of Vertex Values, as appropriate. The computed results will also be printed in the
FLUENT console window.
To save the computed results to a file, click the
Write... button and specify the filename in the resulting
Select File dialog box.
Note the following items:
Mass averaging "weights'' toward regions of higher velocity (i.e., regions where more mass crosses the surface).
Flow rates reported using the
Surface Integrals panel are not as accurate as those reported with the
Flux Reports panel (described in Section
The facet and vertex average options are recommended for zero-area surfaces.