Horizontal Wind Model
Transform horizontal wind into body-axes coordinates
Library
Environment/Wind
Description
The Horizontal Wind Model block computes the wind velocity in body-axes coordinates.
The wind is specified by wind speed and wind direction in Earth axes. The speed and direction can be constant or variable over time. The direction of the wind is in degrees clockwise from the direction of the Earth x-axis (north). The wind direction is defined as the direction from which the wind is coming. Using the direction cosine matrix (DCM), the wind velocities are transformed into body-axes coordinates.
Parameters
- Units
Specifies the input and output units:
Units
Wind Speed
Wind Velocity
Metric (MKS)Meters per second
Meters per second
English (Velocity in ft/s)Feet per second
Feet per second
English (Velocity in kts)Knots
Knots
- Wind speed source
Specify source of wind speed:
ExternalVariable wind speed input to block
InternalConstant wind speed specified in mask
- Wind speed at altitude (m/s)
Constant wind speed used if internal wind speed source is selected.
- Wind direction source
Specify source of wind direction:
ExternalVariable wind direction input to block
InternalConstant wind direction specified in mask
- Wind direction at altitude (degrees clockwise from north)
Constant wind direction used if internal wind direction source is selected. The direction of the wind is in degrees clockwise from the direction of the Earth x-axis (north). The wind direction is defined as the direction from which the wind is coming.
Inputs and Outputs
| Input | Dimension Type | Description |
|---|---|---|
First | Contains the direction cosine matrix. | |
Second (Optional) | Contains the wind speed in selected units. | |
Third (Optional) | Contains the wind direction in degrees. |
| Output | Dimension Type | Description |
|---|---|---|
First | Contains the wind velocity in body-axes, in selected units. |
See Also
Dryden Wind Turbulence Model (Continuous)
Dryden Wind Turbulence Model (Discrete)