Step 6: Velocity Vectors

Graphics and Animations

  Velocity vectors provide an excellent visualization of the flow around the module, depicting details of the wake structure.

1.   Display velocity vectors on the symmetry plane through the module centerline (Figure  24.10).

Graphics and Animations Vectors Set Up...

(a)   Enter 1.9 for Scale.

(b)   Deselect all surfaces from the Surfaces selection list and then select fluid-sym .

(c)   Click Display.

Extra:   You can display velocity vectors for the clipped surfaces.

Graphics and Animations Vectors Set Up...

(a)   Deselect all surfaces from the Surfaces selection list and then select fluid-sym-x-clip and fluid-sym-y-clip.

(b)   Click Display.

2.   Change the colormap layout.

Graphics and Animations Options...

(a)   Enable Axes in the Layout group box.

(b)   Select Left from the Colormap Alignment drop-down list.

(c)   Click Apply and close the Display Options dialog box.

(d)   Rotate and zoom the display to observe the vortex near the stagnation point and in the wake of the module (Figure  24.10).

Figure 24.10: Velocity Vectors in the Module Symmetry Plane

Note:   The vectors in Figure  24.10 are shown without arrowheads. You can modify the arrow style in the Vectors dialog box by selecting a different option from the Style drop-down list.

Extra:   If you want to decrease the number of vectors displayed, then increase the Skip factor to a non-zero value.

3.   Plot velocity vectors in the horizontal plane intersecting the module (Figure  24.11).

Graphics and Animations Vectors Set Up...

  After plotting the vectors, you will enhance the view by mirroring the display about the module centerline and displaying the module surfaces.

(a)   Enable Draw Mesh in the Options group box to open the Mesh Display dialog box.

i.   Ensure that Faces is enabled in the Options group box.

ii.   Retain the selection of board-top and chip from the Surfaces selection list.

iii.   Click the Colors... button to open the Mesh Colors dialog box.

a.   Select Color by Type in the Options group box.

b.   Select wall from the Types selection list.

c.   Select light blue from the Colors selection list and close the Mesh Colors dialog box.

iv.   Click Display and close the Mesh Display dialog box.

(b)   Enter 3.8 for Scale.

(c)   Deselect all surfaces by clicking the unshaded icon to the right of the Surfaces selection list.

(d)   Select y=0.25in from the Surfaces selection list.

(e)   Click Display and close the Vectors dialog box.

(f)   Rotate the display with the mouse to obtain the view as shown in Figure  24.11.

Figure 24.11: Velocity Vectors Intersecting the Surface

4.   Mirror the view about the chip symmetry plane (Figure  24.12).

Graphics and Animations Views...

(a)   Select symmetry-18 from the Mirror Planes selection list.

Note:   This zone is the centerline plane of the module and its selection will create a mirror of the entire display about the centerline plane.

(b)   Click Apply and close the Views dialog box.

  The display will be updated in the graphics window (Figure  24.12).

Figure 24.12: Velocity Vectors After Mirroring