Adjoint-based Calibration of Inlet Boundary Condition for Atmospheric CFD Solvers

An adjoint solver is developed for optimization of inlet velocity boundary condition for incompressible atmospheric boundary layer (ABL) CFD simulations. Using the wind speed observations in the interior domain, the solver computes the gradient of the calibration objective function with respect to inlet velocity components as design variables. The algorithm is implemented in the open source CFD package OpenFOAM. Further, the DAKOTA optimization package is coupled with OpenFOAM and numerical studies are carried out to determine the inlet velocity profile of a 3D domain with a cosine shaped hill. The CFD simulation with optimized inlet velocty profile shows good agreement with experimental study.