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Yaw inertias for fixed-bottom #191

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Sep 20, 2022
Merged

Yaw inertias for fixed-bottom #191

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deaa3c2
use advice from Roger Bergua in setting ED NacYIner and PtfmYIner whe…
gbarter Sep 17, 2022
15cdecb
Enable YawDOF, increase PtfmYIner to test value
dzalkind Sep 19, 2022
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2 changes: 1 addition & 1 deletion examples/06_IEA-15-240-RWT/modeling_options.yaml
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Expand Up @@ -60,7 +60,7 @@ Level3: # Options for WEIS fidelity level 3 = nonlinear time domain
TeetDOF: False
DrTrDOF: False
GenDOF: True
YawDOF: False
YawDOF: True
TwFADOF1 : True
TwFADOF2 : True
TwSSDOF1 : True
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7 changes: 5 additions & 2 deletions weis/aeroelasticse/openmdao_openfast.py
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Expand Up @@ -155,6 +155,7 @@ def setup(self):
self.add_input('tower_height', val=0.0, units='m', desc='tower height from the tower base')
self.add_input('tower_base_height', val=0.0, units='m', desc='tower base height from the ground or mean sea level')
self.add_input('tower_cd', val=np.zeros(n_height_tow), desc='drag coefficients along tower height at corresponding locations')
self.add_input("tower_I_base", np.zeros(6), units="kg*m**2", desc="tower moments of inertia at the tower base")

# These next ones are needed for SubDyn
n_height_mon = n_full_mon = 0
Expand Down Expand Up @@ -879,7 +880,8 @@ def update_FAST_model(self, fst_vt, inputs, discrete_inputs):
fst_vt['ElastoDyn']['HubCM'] = inputs['hub_system_cm'][0] # k*inputs['overhang'][0] - inputs['hub_system_cm'][0], but we need to solve the circular dependency in DriveSE first
fst_vt['ElastoDyn']['NacMass'] = inputs['above_yaw_mass'][0]
fst_vt['ElastoDyn']['YawBrMass'] = inputs['yaw_mass'][0]
fst_vt['ElastoDyn']['NacYIner'] = inputs['nacelle_I_TT'][2]
# Advice from R. Bergua, add 1/3 the tower yaw inertia here because it is activated as a lumped modal mass
fst_vt['ElastoDyn']['NacYIner'] = inputs['nacelle_I_TT'][2] + inputs['tower_I_base'][2]/3.0
fst_vt['ElastoDyn']['NacCMxn'] = -k*inputs['nacelle_cm'][0]
fst_vt['ElastoDyn']['NacCMyn'] = inputs['nacelle_cm'][1]
fst_vt['ElastoDyn']['NacCMzn'] = inputs['nacelle_cm'][2]
Expand Down Expand Up @@ -916,7 +918,8 @@ def update_FAST_model(self, fst_vt, inputs, discrete_inputs):
fst_vt['ElastoDyn']['PtfmMass'] = 0.
fst_vt['ElastoDyn']['PtfmRIner'] = 0.
fst_vt['ElastoDyn']['PtfmPIner'] = 0.
fst_vt['ElastoDyn']['PtfmYIner'] = 0.
# Advice from R. Bergua- Use a dummy quantity (at least 1e4) here when have fixed-bottom support
fst_vt['ElastoDyn']['PtfmYIner'] = 1e8 if modopt['flags']['offshore'] else 0.0
fst_vt['ElastoDyn']['PtfmCMxt'] = 0.
fst_vt['ElastoDyn']['PtfmCMyt'] = 0.
fst_vt['ElastoDyn']['PtfmCMzt'] = float(inputs['tower_base_height'])
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1 change: 1 addition & 0 deletions weis/glue_code/glue_code.py
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Expand Up @@ -436,6 +436,7 @@ def setup(self):
self.connect('tower.cd', 'aeroelastic.tower_cd')
self.connect('tower_grid.height', 'aeroelastic.tower_height')
self.connect('tower_grid.foundation_height', 'aeroelastic.tower_base_height')
self.connect('towerse.tower_I_base', 'aeroelastic.tower_I_base')
if modeling_options["flags"]["monopile"] or modeling_options["flags"]["jacket"]:
self.connect('fixedse.torsion_freqs', 'aeroelastic.tor_freq', src_indices=[0])
self.connect('fixedse.tower_fore_aft_modes', 'aeroelastic.fore_aft_modes')
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