add init carveout and add validator to flow field arrays

floris/simulation/flow_field.py

@@ -27,9 +27,9 @@
     Grid,
 )
 from floris.type_dec import (
+    array_5D_field,
     floris_array_converter,
     NDArrayFloat,
-    validate_3DArray_shape,
     ValidateMixin,
 )
 
@@ -49,16 +49,18 @@ class FlowField(BaseClass, ValidateMixin):
 
     n_wind_speeds: int = field(init=False)
     n_wind_directions: int = field(init=False)
-
-    u_initial_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    v_initial_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    w_initial_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    u_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    v_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    w_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    u: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    v: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
-    w: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
+    n_turbines: int = field(init=False)
+    grid_resolution: int = field(init=False)
+
+    u_initial_sorted: NDArrayFloat = array_5D_field
+    v_initial_sorted: NDArrayFloat = array_5D_field
+    w_initial_sorted: NDArrayFloat = array_5D_field
+    u_sorted: NDArrayFloat = array_5D_field
+    v_sorted: NDArrayFloat = array_5D_field
+    w_sorted: NDArrayFloat = array_5D_field
+    u: NDArrayFloat = array_5D_field
+    v: NDArrayFloat = array_5D_field
+    w: NDArrayFloat = array_5D_field
     het_map: list = field(init=False, default=None)
     dudz_initial_sorted: NDArrayFloat = field(init=False, factory=lambda: np.array([]))
 
@@ -133,6 +135,9 @@ def initialize_velocity_field(self, grid: Grid) -> None:
         # determined by this line. Since the right-most dimension on grid.z is storing the values
         # for height, using it here to apply the shear law makes that dimension store the vertical
         # wind profile.
+        self.n_turbines = grid.n_turbines
+        self.grid_resolution = grid.grid_resolution
+
         wind_profile_plane = (grid.z_sorted / self.reference_wind_height) ** self.wind_shear
         dwind_profile_plane = (
             self.wind_shear

floris/type_dec.py

@@ -28,7 +28,11 @@
 import attrs
 import numpy as np
 import numpy.typing as npt
-from attrs import Attribute, define
+from attrs import (
+    Attribute,
+    define,
+    field,
+)
 
 
 ### Define general data types used throughout
@@ -160,6 +164,10 @@ def validate_3DArray_shape(instance, attribute: Attribute, value: np.ndarray) ->
     if not isinstance(value, np.ndarray):
         raise TypeError(f"`{attribute.name}` is not a valid NumPy array type.")
 
+    # Don't fail on the initialized empty array
+    if value.size == 0:
+        return
+
     shape = (instance.n_wind_directions, instance.n_wind_speeds, instance.n_turbines)
     if value.shape != shape:
         # The grid sorted_coord_indices are broadcast along the wind speed dimension
@@ -188,6 +196,10 @@ def validate_5DArray_shape(instance, attribute: Attribute, value: np.ndarray) ->
         print(type(value))
         raise TypeError(f"`{attribute.name}` is not a valid NumPy array type.")
 
+    # Don't fail on the initialized empty array
+    if value.size == 0:
+        return
+
     grid = instance.grid_resolution
     shape = (instance.n_wind_directions, instance.n_wind_speeds, instance.n_turbines, grid, grid)
     if value.shape != shape:
@@ -265,7 +277,10 @@ def validate(self) -> None:
         attrs.validate(self)
 
 
-# Avoids constant redefinition of the same attr.ib properties for model attributes
+# Avoids constant redefinition of the same field properties for model attributes
+
+array_5D_field = field(init=False, factory=lambda: np.array([]), validator=validate_5DArray_shape)
+
 
 # from functools import partial, update_wrapper