CFD transition model for rough surfaces
report
An investigation to develop and implement a transport equation based boundary layer
transition model for rough surfaces was successfully completed. This implementation
was carried out for the open-source CFD code OpenFOAM, which was then calibrated
using an experimental study. Numerous verification and validations studies were
performed to establish realistic results for predicting roughness induced flow transition
for wind turbine application.
Based on this study, it is clear that the newly developed CFD model, calibrated with
the measured transition locations shows good agreement of the aerodynamic forces
for airfoils with leading-edge roughness heights in the order of 140-200um. Despite
matching the location of the transition point, the results indicate that for a smaller
roughness height of 100um, the model fails to accurately predict the measured forces.
Due to a limited number of measurement data used for calibration of this model,
further tuning with validation study using another independent measurement is recommended,
especially for modelling the effect of roughness density
transition model for rough surfaces was successfully completed. This implementation
was carried out for the open-source CFD code OpenFOAM, which was then calibrated
using an experimental study. Numerous verification and validations studies were
performed to establish realistic results for predicting roughness induced flow transition
for wind turbine application.
Based on this study, it is clear that the newly developed CFD model, calibrated with
the measured transition locations shows good agreement of the aerodynamic forces
for airfoils with leading-edge roughness heights in the order of 140-200um. Despite
matching the location of the transition point, the results indicate that for a smaller
roughness height of 100um, the model fails to accurately predict the measured forces.
Due to a limited number of measurement data used for calibration of this model,
further tuning with validation study using another independent measurement is recommended,
especially for modelling the effect of roughness density
Topics
TNO Identifier
962049
Publisher
TNO
Collation
19 p.
Place of publication
Petten