If you have created a surface, but you do not want to use the whole surface to display data, you can clip the surface between two isovalues to create a new surface that spans a specified subrange of a specified scalar quantity. The clipped surface consists of those points on the selected surface where the scalar field values are within the specified range. For example, in Figure
27.9.1 the external wall has been clipped to values of
coordinate less than 0 to show only the back half of the wall, allowing you to see the valve inside the intake port.
Figure 27.9.1: External Wall Surface Isoclipped to Values of
To clip an existing surface, you will use the
Iso-Clip panel (Figure
Figure 27.9.2: The
The steps for clipping a surface are as follows:
Choose the scalar variable on which the clipping will be based in the
Clip To Values Of drop-down list. First, select the desired category in the upper list. You can then select from related quantities from the lower list. (See Chapter
30 for an explanation of the variables in the list.)
Select the surface to be clipped in the
Clip Surface list.
Click on the
Compute button to calculate the minimum and maximum values of the selected scalar field on the selected surface. The minimum and maximum values will be displayed in the
Define the clipping range using one of the following methods.
- You can set the upper and lower limits of the clipping range interactively by moving the indicator in each dial (i.e., the dial above the
Max field) with the left mouse button. The value in the corresponding
Max field will be updated automatically. This method will also create a temporary surface in the graphics window. Using the dials allows you to preview a clipped surface before creating it.
| Even though the clipped surface is displayed, it is only a temporary surface. To create the new surface, use the
Clip button after deciding on the clipping range.
- You can type the minimum and maximum values in the clipping range directly in the
If you do not want to use the default name assigned to the surface, enter a new name under
New Surface Name. The default name is the concatenation of the surface type and an integer which is the new surface ID (e.g.,
clip-density-8). (If the
New Surface Name you enter is the same as the name of a surface that already exists,
FLUENT will automatically assign the default name to the new surface when it is created.)
| The surface name that you enter must begin with an alphabetical letter. If your surface name begins with any other character or number,
FLUENT will not accept the entry.
Click on the
Clip button. The new surface name will be added to the
Clip Surface list in the panel. (The original surface will remain unchanged.)
If you want to delete or otherwise manipulate any surfaces, click on the
Manage... button to open the
Surfaces panel. See Section
27.11 for details.
27. Creating Surfaces for
27.10 Transforming Surfaces
© Fluent Inc. 2006-09-20