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style="background: radial-gradient(ellipse at 50% 80%,rgba(194,97,254,0.15),hsla(0,0%,100%,0));"
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{{< hextra/feature-card
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title="Wave Scatter Diagram Tool"
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subtitle="The Wave Scatter Diagram Tool generates **global wave scatter diagrams** in accordance with **DNVGL-RP-C205**. It uses the DNV-recommended Conditional Modelling Approach (CMA) to estimate sea state occurrence for different navigational zones, supports Weibull and Log-Normal distributions for HS and TZ(**Nautic zones**, **North Atlantic** and **World Wide trade**), allows user-defined bin settings, and enables export of data and figures for direct use in reports."
Hextra supports creating site with multiple languages using Hugo's [multilingual mode](https://gohugo.io/content-management/multilingual/).
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# Tutorial: DP Capability Analysis for an Offshore Wind Turbine Installation Vessel
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<!--more-->
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## 1. Introduction
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## Enable Multi-language
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This tutorial demonstrates how to use the **DP Capability Tool** to perform **feasibility calculation** and **capability analyses** for an offshore wind turbine installation vessel equipped with:
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To make our site multi-language, we need to tell Hugo the supported languages. We need to add to the site configuration file:
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-**2 azimuth thrusters at the bow**
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-**3 tunnel thrusters at the stern**
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```yaml {filename="hugo.yaml"}
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defaultContentLanguage: en
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languages:
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en:
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languageName: English
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weight: 1
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fr:
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languageName: Français
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weight: 2
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ja:
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languageName: 日本語
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weight: 3
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```
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The complete tutorial model is provided within the software and is accessible from the Help menu.
Hugo supports managing translations by filename. For example, if we have a file `content/docs/_index.md` in English, we can create a file `content/docs/_index.fr.md` for French translation.
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---
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## 2. Vessel data (Optional)
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In a standard DP capability analysis, the first step is to input **vessel data**, which defines the vessel reference frame and serves as a container for thruster positions.
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This step is optional but recommended for clarity and future model extension.
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> **Note:** The vessel outline is used for visualization only and does **not** affect DP calculation results.
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### Vessel outline coordinates
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| X (m) | Y (m) |
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|------:|------:|
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| 120.0 | 0.0 |
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| 90.0 | 25.0 |
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| -120.0 | 25.0 |
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| -120.0 | -25.0 |
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| 90.0 | -25.0 |
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These outline points are linked together into a closed frame, helping users visually check and confirm the thruster locations relative to the vessel's hull.
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---
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## 3. Thruster configuration
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This vessel configuration includes:
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-**Azimuth thrusters (bow)**
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Capable of generating thrust in any direction from **0° to 360°**
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-**Tunnel thrusters (stern)**
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Capable of generating thrust to either **port** or **starboard**
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There are **no shaft propellers** in this tutorial case.
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---
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### 3.1 Thrusters
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For each azimuth or tunnel thruster, the following parameters must be defined:
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{{< filetree/container >}}
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{{< filetree/folder name="content" >}}
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{{< filetree/folder name="docs" state="open" >}}
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{{< filetree/file name="_index.md" >}}
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{{< filetree/file name="_index.fr.md" >}}
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{{< filetree/file name="_index.ja.md" >}}
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{{< /filetree/folder >}}
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{{< /filetree/folder >}}
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{{< /filetree/container >}}
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- Thruster name
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- X coordinate (m)
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- Y coordinate (m)
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- Propeller diameter (m)
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- Maximum power (kW)
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- Maximum nominal thrust (kN)
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- Default thrust loss factor
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Note: Hugo also supports [Translation by content directory](https://gohugo.io/content-management/multilingual/#translation-by-content-directory).
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Each thruster is positioned relative to the vessel reference coordinate system. When a thrust loss factor curve is not supplied, the default thrust loss factor is applied to calculate the thrust force. It is especially applicable to azimuth thrusters.
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## Translate Menu Items
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#### Azimuth Thrusters
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To translate menu items in the navigation bar, we need to set the `identifier` field:
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| Name | X (m) | Y (m) | Diameter (m) | Max power (kW) | Nominal thrust (kN) | Default thrust loss factor |
The thruster position plot displays each azimuth thruster, tunnel thruster, and shaft propeller using a distinct shape and color for each type. When a thruster is selected in the list, it will be highlighted in the plot accordingly.
Wave Scatter Diagram Tool enables the generation of site-specific wave scatter diagrams worldwide in accordance with DNVGL-RP-C205, supporting offshore structure and mooring design for both Ultimate Limit State (ULS) and Fatigue Limit State (FLS) assessments. It applies the Conditional Modelling Approach (CMA) joint environmental model recommended by DNV, allowing designers to estimate sea state occurrence probabilities in the absence of detailed metocean reports. The tool supports nautical zone–based scatter diagrams using Weibull and Log-Normal distribution parameters for significant wave height (HS) and zero-crossing period (TZ), as well as joint environmental models for North Atlantic and worldwide ship operations. Users can customize bin widths and midpoints, export scatter data to text or Excel formats, and save publication-ready figures for direct inclusion in technical reports.
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---
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## Key features
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{{< cards cols="1" >}}
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{{< card
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title="Scatter diagram of various nautic zones"
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subtitle="Scatter diagram by 2-parameter Weibull parameters and Log-Normal distribution parameters for Hs and Tz (γs = 0) "
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