> For the complete documentation index, see [llms.txt](https://docs.whiffle.cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.whiffle.cloud/getting-started/adding-a-custom-turbine/best-practices-for-turbine-specs.md).

# Best practices for turbine specs

## Generic

### Turbine type

This is the name for your turbine type. Throughout the simulation setup, this name will serve as the reference for selecting your specific turbine model.

### Power curve air density

Enter the manufacturer's power curve air density. Power curves are adjusted in-simulation to the current site conditions.

### Power curve turbulence intensity

If available, enter the manufacturer's power curve turbulence intensity to enhance the accuracy; if not, a default value of 0.08 is recommended.

The manufacturer of the turbine provides the power curve based on specified power curve turbulence intensity (Ti) and reference air density. In Whiffle LES, the power curve is adjusted according to actual atmospheric conditions, using the power curve Ti and power curve air density. 

Incorrect references can lead to a shift in the power curve, causing a bias in recorded power output. This bias, depicted in the figure below, can be positive or negative depending on whether the references are over or under specified. The magnitude of the bias can vary by several percentage points depending on the accuracy of the references.

<figure><img src="/files/m6rF1SQhV1mGko0wN6eH" alt=""><figcaption></figcaption></figure>

## Power & Thrust <a href="#addingacustomturbine-step2-power-and-thrust" id="addingacustomturbine-step2-power-and-thrust"></a>

### **Reference wind speed \[m/s]**

Please ensure that all values are unique and arranged in ascending order.

### **Power \[kW]**

Ensure that the power specification includes at least one value below the rated power indicated in the previous step.


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