Środowiskowe Seminarium Fizyki Atmosfery

A novel theoretical formulation and corresponding numerical solutionsare presented for fluid flow and sediment transport past evolutionarysand dunes. From the theoretical view point, dunes development andaccompanying sand transport is a fundamental dynamical mechanism withchallenging detail. In particular, predicting sediment transport andbed evolution in severe wind conditions depends on accurate predictionof a flow past complex boundary evolving with the flow itself.Time-dependent curvilinear coordinates are employed to fully coupleflow aloft with the developing landform. The differential conservationlaw that defines shape of the lower boundary (viz. landform) dependson details of local surface stress, thereby favoring the large eddysimulation (LES) of the atmospheric boundary layer.Reference: Ortiz and Smolarkiewicz, Phys. Rev. E 79, 041307 (2009)