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CurledWake: full divergence form for delta_u diffusion #34

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CurledWake: full divergence form for delta_u diffusion #34

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9 changes: 5 additions & 4 deletions mitwindfarm/CurledWake.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,6 @@
DomainExpansionRequest,
)
from UnifiedMomentumModel.Utilities.Geometry import calc_eff_yaw, eff_yaw_rotation, eff_yaw_inv_rotation
from mitwindfarm.utils.differentiate import second_der


class CurledWakeWindfield(Windfield):
Expand Down Expand Up @@ -421,9 +420,11 @@ def _step(x, _state):
# gradient fields of \Delta u:
dudy = np.gradient(_u, y, axis=0)
dudz = np.gradient(_u, z, axis=1)
d2udy2 = second_der(_u, self.dy, axis=0)
d2udz2 = second_der(_u, self.dz, axis=1)
dudx = (-v * dudy - w * dudz + nu_T * (d2udy2 + d2udz2) + self.extra_fx) / u
div_nuu = (
np.gradient(nu_T * dudy, y, axis=0, edge_order=2)
+ np.gradient(nu_T * dudz, z, axis=1, edge_order=2)
)
dudx = (-v * dudy - w * dudz + div_nuu + self.extra_fx) / u

self.extra_fx *= 0 # reset extra forces after they are used - TODO: remove

Expand Down