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Fully disable 2nd tower mode shapes if DOF is disabled #466

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Merged
dzalkind merged 1 commit into from
Apr 6, 2026
+10 −1
Merged

Fully disable 2nd tower mode shapes if DOF is disabled #466

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11 changes: 10 additions & 1 deletion weis/aeroelasticse/openmdao_openfast.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1200,9 +1200,18 @@ def update_FAST_model(self, fst_vt, inputs, discrete_inputs):
if not np.any(inputs[f'{fass}_modes'][idir,:]):
logger.warning(f'WARNING: {fass} tower shape coefficients are zero which will cause errors in using ElastoDyn')
fst_vt['ElastoDynTower']['TwFAM1Sh'] = inputs['fore_aft_modes'][0, :] / np.sum(inputs['fore_aft_modes'][0, :])
fst_vt['ElastoDynTower']['TwFAM2Sh'] = inputs['fore_aft_modes'][1, :] / np.sum(inputs['fore_aft_modes'][1, :])
fst_vt['ElastoDynTower']['TwSSM1Sh'] = inputs['side_side_modes'][0, :] / np.sum(inputs['side_side_modes'][0, :])

# Since the 2nd tower modes are sometimes problematic, if the DOF is not enabled, let's give it a safe, dummy value that won't cause errors in ElastoDyn
fst_vt['ElastoDynTower']['TwFAM2Sh'] = inputs['fore_aft_modes'][1, :] / np.sum(inputs['fore_aft_modes'][1, :])
if not fst_vt['ElastoDyn']['TwFADOF2']:
fst_vt['ElastoDynTower']['TwFAM2Sh'] = np.zeros_like(inputs['fore_aft_modes'][1, :])
fst_vt['ElastoDynTower']['TwFAM2Sh'][0] = 1.0

fst_vt['ElastoDynTower']['TwSSM2Sh'] = inputs['side_side_modes'][1, :] / np.sum(inputs['side_side_modes'][1, :])
if not fst_vt['ElastoDyn']['TwSSDOF2']:
fst_vt['ElastoDynTower']['TwSSM2Sh'] = np.zeros_like(inputs['side_side_modes'][1, :])
fst_vt['ElastoDynTower']['TwSSM2Sh'][0] = 1.0

# Calculate yaw stiffness of tower (springs in series) and use in servodyn as yaw spring constant
k_tow_tor = inputs['tor_stff'] / np.diff(inputs['tower_z'])
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