Create a Line Rake and Streamline

  1. Do one of the following:
    • From the Create tools, select Create > CFD.Then, from the Streamlines panel, click Add
    • Right-click in the Results Browser and select Create > Streamline from the context menu.
    A new rake is added to the panel list. The newly added rake is automatically labeled, and is added to the bottom of the list.
    Tip: You can rename the rake using the right-click context menu.
  2. From the Streamlines panel, select Line from the Rake type drop-down menu.
    A Line rake is defined by two end points.
  3. Define the end points of the rake.
    • Pick two directly from the model in the modeling window.
    • Click the node/vector input collector N1, N2 and select By ID to select your desired nodes.
    HyperView will automatically provide the X, Y, Z positions (coordinates) of the nodes at the time of definition.

    Click the expansion button to open the Reference point dialog in order to review or change these coordinates.

    Tip: Alternatively, if you know the specific coordinates of the end points defining the rake, you can simply enter them in the X, Y, Z coordinate text boxes.
    Important: It is important to make sure at least a portion of the rake (at least one of the rake headers) is in the fluid field. Therefore it is highly recommended that once the nodes have been selected, that you then modify the point coordinates by giving them a small offset to make sure the rake is in the "main stream", instead of the boundary layer. This will ensure that full streamlines are created.

    You can also use the graphical manipulator to modify the rake location to ensure it is in the “main stream”, and that all requested streamlines are generated.

  4. Select the integration mode for the rake from the Integration mode drop-down menu.
    Option Description
    Downstream Integration is done following the velocity field direction.
    Upstream Integration is done upstream, or opposite, to the velocity field direction.
    Both Integration is done both downstream and upstream.
  5. Enter the number of desired seeds in the Number of seeds text box.
  6. From the Streamlines tab, select the vector field to be used for streamline creation (typically the velocity field) from the Source drop-down menu.
    Note: You can also click Advanced to open the dialog which allows you to change a number of parameters that control how the streamlines are generated.
    In addition, the Tracers tab can also be used to create and animate streamlines with particles traveling along the streamlines:
    1. Click on the Tracers tab
    2. Enter your desired options for tracer designs, coloring options, and injection modes.
    3. Click on the Create button to start the animation.
  7. Enter/select your desired Display options.
    Option Description
    Auto-generate Activate the check box to automatically generate streamlines upon release of the mouse button, if the rake remains at least partly in the fluid domain and the stream lines existed prior to changing the rake.

    If the streamline is contoured prior to changing the rake, the contour will be automatically regenerated also.
    Draw as tube Active this option to draw the streamlines as tubes instead of lines.

    The streamlines will appear to have a larger diameter (for the same streamline size) when this option is activated.
    Streamline size

    OR

    Seed marker size

    		 Enter the relative scale for the streamline thickness. The value must be a positive whole number.

    OR

    Enter the size of the seed nodes which are being used as the starting point for the streamline generation.
    Color by Select Seed from the drop-down menu to use the number specified in the Number of colors text box to distinguish streamlines.
    Note: This option is disabled if a contour is applied to the model. HyperView supports streamline contouring for nodal results only (elemental results are not supported).
    Tip: To remove the contour, and enable the Color by option, go to the Contour panel and click Clear Contour.
    Number of colors Enter the number of distinct colors (1-14) to use when the Color by drop-down menu is set to Seed.
  8. Click the Create Streamlines button to create and view the streamlines.
  9. Optional: Use the Graphical Manipulator to rotate, translate, or modify the scale of the rake.