ED: Extended yaw-friction modeling#2561
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andrew-platt merged 10 commits intoOpenFAST:devfrom Dec 18, 2024
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…n and additional Coulomb-friction terms proportional to yaw-bearing shear force and bending moment
…gion where the quadratic viscous friction should be linearized
…coefficients for the yaw bearing are greater than or equal to their dynamic counterparts
luwang00
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jjonkman
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Dec 16, 2024
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jjonkman
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I reviewed the implementation plan with Lu previously and these changes match my expectations.
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@abhineet-gupta -- Could you review this one as well considering you implemented the original version in PR #2017? |
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Will do. |
andrew-platt
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Dec 16, 2024
abhineet-gupta
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Dec 17, 2024
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This was referenced Jan 20, 2026
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Feature or improvement description
This PR extends the existing yaw-friction modeling in ElastoDyn with
YawFrctMod=2with additional terms. The extended list of inputs for yaw-friction modeling is listed below.When
YawFrctMod=2, the new inputsM_FCSmaxandM_MCSmaxallow the introduction of static Coulomb friction terms proportional to the yaw-bearing shear force and bending moment, respectively. This is in addition to the term proportional to the yaw-bearing axial force controlled byM_CDmax. The dynamic counterparts toM_FCSmaxandM_MCSmaxare also added. These are the newM_FCDandM_MCDinputs.For viscous friction, an additional quadratic friction coefficient
sig_v2is introduced. Finally,OmgCutdefines a region about zero yaw rate where the quadratic viscous friction is to be linearized. SettingOmgCut=0disables linearization.OmgCuthas no effect whensig_v2=0.All new inputs are required to be equal to or greater than zero. Furthermore, the static Coulomb friction coefficients,
M_CSmax,M_FCSmax, andM_MCSmaxall need to be greater than or equal to their dynamic counterparts,M_CD,M_FCD, andM_MCD, respectively. These requirements are checked and enforced in the code.The ElastoDyn input and theory documentation have been updated to reflect the extended list of inputs and the new yaw-friction formulation.
Impacted areas of the software
ElastoDyn
Test results, if applicable
No change to existing test results, but the r-test ElastoDyn input files need to be updated with the new inputs. Please see the r-test pointer from this PR.