Support timeseries with turbine-specific speeds

[kilojoules]

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[Copilot]

Pull request overview

This PR adds support for time-series wind resource data where wind speed and direction are turbine-specific (2D arrays with dimensions: time × turbine). The implementation handles averaging turbine-specific values to create reference arrays for simulation while preserving local site conditions through XRSite.

Key Changes

• Enhanced dict_to_site to intelligently rename wind variables based on whether they are coordinates or data variables
• Added logic to extract and process turbine-specific wind data, computing reference arrays using arithmetic mean for wind speed and vector mean for wind direction
• Implemented conditional site creation: XRSite for turbine-specific data, Hornsrev1Site for uniform data
• Added comprehensive test case with manual verification

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
wifa/pywake_api.py	Core implementation: enhanced dict_to_site with smart renaming, added get_resource_data helper, implemented turbine-specific data averaging logic, and conditional site selection
tests/test_pywake.py	New test function validating turbine-specific time-series handling with manual PyWake calculation for verification
examples/cases/turbine_specific_speeds_timeseries/wind_energy_system/system.yaml	System configuration YAML for test case
examples/cases/turbine_specific_speeds_timeseries/wind_energy_system/analysis.yaml	Analysis parameters configuration
examples/cases/turbine_specific_speeds_timeseries/plant_wind_farm/FLOW_toy_study_wind_farm.yaml	Wind farm layout with 4 turbines in a line
examples/cases/turbine_specific_speeds_timeseries/plant_energy_turbine/DTU_10MW_turbine.yaml	Turbine specification using DTU 10MW power and Ct curves
examples/cases/turbine_specific_speeds_timeseries/plant_energy_site/FLOW_toy_study_energy_site.yaml	Site boundaries definition
examples/cases/turbine_specific_speeds_timeseries/plant_energy_resource/Stochastic_atHubHeight.nc	NetCDF file containing turbine-specific wind data
examples/cases/turbine_specific_speeds_timeseries/plant_energy_resource/FLOW_toy_study_energy_resource.yaml	Resource configuration referencing the NetCDF file

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