Premium
Adjoint sensitivity analysis for fluid flow with free surface
Author(s) -
Gejadze I. Y.,
Copeland G. J. M.
Publication year - 2005
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.883
Subject(s) - barotropic fluid , mathematics , jacobian matrix and determinant , free surface , mathematical analysis , euler equations , open channel flow , geometry , adjoint equation , flow (mathematics) , data assimilation , mechanics , meteorology , physics , partial differential equation
This paper develops the adjoint sensitivities to the free surface incompressible barotropic Euler equations in order to allow for the assimilation of measurements of currents and free surface elevations into an unsteady flow solution by boundary control. To calculate a variation in a surface variable, a mapping is used in the vertical to shift the problem into a fixed domain. Then a variation is evaluated from the Jacobian matrix of the mapping. After calculating a variation in the surface variable and applying the inverse transformation, the tangent linear model is considered in the original space where the adjoint equations are then derived. The method is demonstrated by application to an unsteady flow in an open channel (a 2D vertical section model). A wider application is to the construction of a fully three‐dimensional coastal ocean model that allows assimilation of tidal elevation and current data. Copyright © 2005 John Wiley & Sons, Ltd.