> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Parametric Impeller

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> This page is for AI assistant context only. To use this package, visit [community.ntop.com](https://community.ntop.com/packages/ntop/parametric-impeller).

## Summary

This parametric notebook generates exponentially twisted primary and secondary vanes, all driven by adjustable parameters such as twist rate, vane count, and radial taper.

## Package Details

| Field            | Value                             |
| ---------------- | --------------------------------- |
| **ID**           | `parametric-impeller`             |
| **Type**         | Notebook                          |
| **Author**       | nTop                              |
| **Version**      | 1.0.0                             |
| **nTop Version** | 5.45+                             |
| **Domain**       | Mechanical                        |
| **Application**  | Turbomachinery                    |
| **Complexity**   | Intermediate                      |
| **Tags**         | `turbo`, `impeller`, `parametric` |
| **License**      | MIT                               |
| **Verified**     | Yes                               |

***

This parametric notebook generates high-fidelity pump geometry by combining a drafted central column with exponentially twisted primary and secondary vanes, all driven by adjustable fluid dynamics parameters like twist rate, vane count, and radial taper.

## **What you get**

* **Complex Vane Morphologies:** Primary and secondary vanes with independent height and count controls.
* **Advanced Twist Control:** Exponentially ramped twist rates to optimize flow behavior at the vane tips.
* **Manufacturing Ready:** Integrated radial draft angles and central column blending for castability or 3D printing.
* **Robust Field Logic:** Implicit modeling ensures clean Booleans and predictable offsets for downstream shelling or simulation.

## **Inputs**

| Name                     | Type       | Notes                                             |
| ------------------------ | ---------- | ------------------------------------------------- |
| `Vanes Max Height`       | Scalar     | Maximum height of the primary vanes.              |
| `Vanes Primary Count`    | Integer    | Total number of primary vanes in the polar array. |
| `Secondary Vanes Height` | Scalar     | Height multiplier for the secondary vanes.        |
| `Min Radius`             | Scalar     | The inner radius at the top of the vanes.         |
| `Max Radius`             | Scalar     | The overall outer radius of the impeller.         |
| `Top Vane Taper`         | Angle      | Taper angle of the vane cutouts at the top.       |
| `Linear Twist Rate`      | Twist Rate | Base twist rate applied to the vanes (deg/mm).    |
| `Top Twist Ramp`         | Twist Rate | Exponential increase of twist near the vane tips. |
| `Exp. k Factor`          | Scalar     | Growth factor for the exponential twist ramp.     |
| `Plate Thickness`        | Scalar     | Thickness of the bottom mounting plate.           |
| `Column Radius`          | Scalar     | Radius of the central mounting column.            |
| `Center Blend Radius`    | Scalar     | Radius of the blend between the plate and column. |
| `Vane Thickness`         | Scalar     | Nominal wall thickness of the vanes.              |
| `Draft Angle`            | Angle      | Radial draft applied to vanes for mold release.   |
| `Hole Radius`            | Scalar     | Radius of the central shaft hole.                 |

## **Outputs**

| Name          | Type          | Notes                                                            |
| ------------- | ------------- | ---------------------------------------------------------------- |
| `Final Solid` | Implicit Body | The completed impeller geometry, ready for simulation or export. |

## **Modeling Principles**

* **Late Trimming:** To maintain field integrity, all components are modeled as "infinite" bodies and intersected with a master domain at the final step.
* **Normalized Fields:** The twist operation uses normalized distance fields to prevent thickness distortion during high-twist maneuvers.
* **Interactive Polar Arrays:** Utilizes a custom remap-based polar array for faster performance and better field continuity than standard geometry-based arrays.

## **License**

MIT.

***

## Source

[https://community.ntop.com/packages/ntop/parametric-impeller](https://community.ntop.com/packages/ntop/parametric-impeller)