Impeller > Meridional contour > Hub/Shroud solids

Meridional solid can be designed by selecting the "Hub/ Shroud solids" page on top left and activate the feature on the right side. Initial contours will be visible, which can be manipulated using the control points and the context menu of the curve.

Some diagram display settings are available using the button bottom left.

After the model finishing the meridional solid parts and the blade solid are connected to a single solid geometry, "Meridian.Material domain".

Solid design

Hub & Shroud solids can be designed by manipulating their meridional contours. The feature is available if the following conditions are fulfilled:

•Hub: Only available for existing hub contour

•Shroud: Only available for shrouded impellers

By activating one of the solids a default solid contour is shown. This contour is represented by a wire connecting the endpoints of meridional hub or shroud contour and can be modified interactively using its graphical elements. To provide complex solid contours the wire can consist of various edges which can be configured independently from each other. They are separated visually by squared control points. In contrast circular control points belong to edges and are connected by a dashed control polygon. Apart from the endpoints of the wire, all control points are moveable.

Context menus of contour wire

Besides drag & drop of control points context menus of graphical objects are alternative means to modify the contour. They are accessible via right-clicking and contain useful tools for the graphical object underneath.

Connector point

•Edit point: Opens a small panel to set coordinates of control point.

•Merge curve: Transforms connector into inner control point by merging control polygons. Note that this option is only available if neighboring curves are from the same edge type.

Meridional contour of primary flow path

•Set offset curve: Resets the complete wire using a user-defined offset. This offset is not kept when changing the meridional contour.

Edge types of contour wire

An edge of a contour wire can be one of the following type:

•Bezier curve
The curve is defined by the position of the Bezier points.
¢ Details

•Line segment curve
The curve consists of straight lines and rounded corners. (optional)
¢ Details

Snapping

To simplify contour design snapping of points on coordinates and lines can be used. This mode can be chosen by clicking on the right corner below of the diagram and selecting one of the snapping types:

Snapping types

•Point: Currently moved point snaps to x and y ordinates of other points related to the wire. This also includes ordinates of its start position.

•Line: Currently moved point snaps to lines defined by all pairs of nearby points along the wire. This also includes the two lines crossing its start position.

Note that snapping can be deactivated temporarily by pressing Shift while dragging.

Possible warnings

Problem	Possible solution
Hub/ Shroud contour of solid has invalid edges.
When using Line segment curves with rounded corners the defined radius could be too large. This can result in sharp edges and very small segments.	Corner radius of the invalid (red) curve has to be reduced. This could be achieved by dragging the circle center. The curve is valid when it is no longer drawn in red.

Problem

Possible solution

Hub/ Shroud contour of solid has invalid edges.

When using Line segment curves with rounded corners the defined radius could be too large. This can result in sharp edges and very small segments.

Corner radius of the invalid (red) curve has to be reduced. This could be achieved by dragging the circle center. The curve is valid when it is no longer drawn in red.