def test_NOJ_Nibe_result():
# Replicate result from: Jensen, Niels Otto. "A note on wind generator interaction." (1983).
wake_model = NOJ(NibeA0)
WS_ilk = np.array([[[8.1]], [[8.1]], [[8.1]]])
TI_ilk = np.zeros_like(WS_ilk)
site = UniformSite([1], 0.1)
dw_iil, cw_iil, dh_iil, dw_order_indices_l = site.wt2wt_distances(
x_i=[0, 0, 0], y_i=[0, -40, -100], h_i=[50, 50, 50], wd_il=[[0]])
WS_eff_ilk = wake_model.calc_wake(WS_ilk, TI_ilk, dw_iil, cw_iil, dh_iil, dw_order_indices_l, [0, 1, 1])[0]
npt.assert_array_almost_equal(WS_eff_ilk[:, 0, 0], [8.1, 4.35, 5.7])
def test_NOJ_two_turbines_in_row(wdir, x, y):
# Two turbines in a row, North-South
# Replicate result from: Jensen, Niels Otto. "A note on wind generator interaction." (1983).
windTurbines = NibeA0
wake_model = NOJ(windTurbines)
WS_ilk = np.array([[[8.1]], [[8.1]], [[8.1]]])
TI_ilk = np.zeros_like(WS_ilk)
site = UniformSite([1], 0.1)
dw_iil, cw_iil, dh_iil, dw_order_indices_l = site.wt2wt_distances(x_i=x, y_i=y, h_i=[50, 50, 50], wd_il=[[wdir]])
WS_eff_ilk = wake_model.calc_wake(WS_ilk, TI_ilk, dw_iil, cw_iil, dh_iil, dw_order_indices_l, [0, 0, 0])[0]
ws_wt3 = 8.1 - np.sqrt((8.1 * 2 / 3 * (20 / 26)**2)**2 + (8.1 * 2 / 3 * (20 / 30)**2)**2)
npt.assert_array_almost_equal(WS_eff_ilk[:, 0, 0], [8.1, 4.35, ws_wt3])
def test_NOJ_6_turbines_in_row():
n_wt = 6
x = [0] * n_wt
y = - np.arange(n_wt) * 40 * 2
wake_model = NOJ(NibeA0)
site = UniformSite([1], .1)
WD_ilk, WS_ilk, _, _ = site.local_wind(x_i=x, y_i=y, wd=[0], ws=[11])
TI_ilk = np.zeros_like(WS_ilk)
site = UniformSite([1], 0.1)
dw_iil, cw_iil, dh_iil, dw_order_indices_l = site.wt2wt_distances(
x_i=x, y_i=y, h_i=[50] * n_wt, wd_il=WD_ilk.mean(2))
WS_eff_ilk = wake_model.calc_wake(WS_ilk, TI_ilk, dw_iil, cw_iil, dh_iil, dw_order_indices_l, [0] * n_wt)[0]
np.testing.assert_array_almost_equal(
WS_eff_ilk[1:, 0, 0], 11 - np.sqrt(np.cumsum(((11 * 2 / 3 * 20**2)**2) / (20 + 8 * np.arange(1, 6))**4)))
