The Tweak command allows you to individually move the grid points of a selected connector, domain, or block in order to locally improve the quality of a handful of cells. This feature is a good complement to Fidelity Pointwise’s current suite of grid solvers. While a solver generally affects all of the cells in a grid, Tweak allows you to modify a single cell to meet specific requirements.
Note: For a prism block, the K cutting planes are available in addition to the XYZ cutting planes in the Tweak command. This allows you to tweak a grid point on a specific grid layer in the marching direction.
For editing interior points of an entity, select the entity then Edit, Tweak. The Tweak panel provides different options based on whether a connector, a domain, or a block entity is selected (see figures below).
For tweaking grid points on a connector or inside of a domain, move the cursor over a target grid point in the Display window and relocate it by one of two methods:
Note that the boundary of the underlying database entity will be highlighted if a selected point is database constrained. If the new location is not satisfactory, use the Restore command within the Points frame to move the grid point back to its original location.
You can continue to select another grid point for modification without leaving the Tweak panel. Click OK to save the new grid and exit the command panel, or click Apply to save your changes and continue modifying your grid. Otherwise, click Cancel to exit the Tweak panel without saving any changes.
Refer to the Point Placement section for more information about the Snap to Points checkbox and the tools in the Advanced frame. Similarly, refer to the Attributes section for detailed descriptions of the commands in the Display frame.
Tip: It is recommended to use the Examine command to check the quality of your grid after tweaking grid points.
When a block is selected for tweaking, a cutting plane is rendered at a default location. This cutting plane has a green border frame and semi opaque shaded interior making it easier to visualize exactly where the cutting plane intersects the model. Note that the frame of the cutting plane can be clicked (this highlights it) and dragged to a new position directly in the Display window.
Additionally, the position of the cutting plane can be specified via either an XYZ or IJK location, or by using the left and right arrow buttons in the Cutting frame. The options within the Cutting frame are described in the section on the Cuts Tab in this User Manual. Once a cutting plane has been specified, use either one of the methods mentioned above to select and move a non-boundary grid point.
By default, the movement of a grid point being dragged to a new position is constrained to a plane that is parallel to the current view plane. Therefore, a tweaked point will be contained on its cutting plane only in the special case when both, the cutting and current view planes, are parallel. On the other hand, a cutting plane whose orientation is not parallel to the current view plane, will not contain any of its tweaked points.
The Options frame offers additional control over the destination of a selected grid point: