Static 2D current field

from datetime import datetime, timedelta
import numpy as np

from opendrift.readers.reader_constant_2d import Reader
from opendrift.models.oceandrift import OceanDrift

Constructing a static, rotating ocean current field,

lon, lat = np.meshgrid(np.linspace(2,6,30), np.linspace(59,62,30))
lon0 = 4
lat0 = 60.5
u = -(lat-lat0)/np.sqrt((lon-lon0)**2 + (lat-lat0)**2)
v = (lon-lon0)/np.sqrt((lon-lon0)**2 + (lat-lat0)**2)
lon = np.linspace(0,5,30)
lat = np.linspace(59,62,30)

r = Reader(x=lon, y=lat, proj4='+proj=latlong',
           array_dict = {'x_sea_water_velocity': u, 'y_sea_water_velocity': v})

o = OceanDrift(loglevel=20)
o.set_config('environment:fallback:land_binary_mask', 0)
o.add_reader(r)
o.seed_elements(lon=3, lat=60.5, number=1000, radius=30000, time=datetime.now())
o.run(duration=timedelta(hours=72))
o.animation(fast=True)

15:05:27 INFO    opendrift.models.basemodel:519: OpenDriftSimulation initialised (version 1.11.10 / v1.11.10-15-g65004d9)
15:05:27 INFO    opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 2.0 m/s. Adding a customised landmask may be faster...
15:05:34 INFO    opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_height: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    x_wind: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    y_wind: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    upward_sea_water_velocity: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    ocean_vertical_diffusivity: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_significant_height: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_swell_wave_to_direction: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_swell_wave_significant_height: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wind_wave_to_direction: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wind_wave_mean_period: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wind_wave_significant_height: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    surface_downward_x_stress: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    surface_downward_y_stress: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    turbulent_kinetic_energy: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    turbulent_generic_length_scale: 0.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    ocean_mixed_layer_thickness: 50.000000
15:05:34 INFO    opendrift.models.basemodel.environment:248:    sea_floor_depth_below_sea_level: 10000.000000
15:05:34 INFO    opendrift.models.basemodel:940: Using existing reader for land_binary_mask
15:05:34 INFO    opendrift.models.basemodel:951: All points are in ocean
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15:05:37 WARNING opendrift.models.basemodel:2415: Plotting fast. This will make your plots less accurate.
/opt/conda/envs/opendrift/lib/python3.11/site-packages/cartopy/mpl/geoaxes.py:1683: UserWarning: No data for colormapping provided via 'c'. Parameters 'cmap' will be ignored
  result = super().scatter(*args, **kwargs)
15:05:40 INFO    opendrift.models.basemodel:4612: Saving animation to /root/project/docs/source/gallery/animations/example_static_2d_current_0.gif...
15:06:25 INFO    opendrift.models.basemodel:3041: Time to make animation: 0:00:48.077218