Fillet

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Fillet

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For fillet cut-water design the spiral and the diffuser are trimmed and rounded at their intersection curve.

Prerequisites:

The wrap angle must be high enough so that spiral and diffuser intersect.

 

The corresponding fillet radius can be specified.

Additionally, the Diffuser base form factor defines the roundness of the first diffuser cross section on its base side and is between 0.2 and 1:

0 = cornered base side (like spiral section)

1 = full rounded base side

The factor affects the shape of the intersection curve and therefore the shape of the cut-water.

Diffuser base form factor for a round spiral cross section

Diffuser base form factor for a round spiral cross section

 

Compares diffuser base form factor of 0.2 and 1.0 for a spiral cross section of type line segments

Compares diffuser base form factor of 0.2 and 1.0 for a spiral cross section of type line segments

The Spiral start position indicates the angular position at which the spiral begins and influences the intersection of spiral and diffuser. It has to be at least 1° and must be lower than the intersection position of spiral and diffuser. If Automatic is activated the optimal angular position is determined automatically.

The Surface transition defines the transition from the side patch surfaces to the central fillet surface:

Tangential: Tangential transition between both surfaces (Time-consuming)

Non-tangential: No tangential transition between both surfaces

Automatic: Tries tangential transition. If it fails, a non-tangential transition is used. (Time-consuming)

 

If the fillet cut-water mode has been chosen, the 3D-model is set to the model state "Solids only" after every update of the design because only then the spiral and diffuser surfaces that are trimmed according to the fillet are visible.