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Title: Development of an adaptive boundary-fitted coordinate code for use in coastal and estuarine areas
Authors: Mississippi State University. Department of Aerospace Engineering.
United States. Assistant Secretary of the Army (R & D)
Thompson, Joe F.
Johnson, Billy H.
Keywords: WESCORA
Computer programs
Mathematical models
Numerical models
Coastal areas
Two-dimensional flow
Chesapeake Bay
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; HL-85-5.
Description: Miscellaneous Paper
Abstract: Most coastal and estuarine systems that have problems requiring numerical hydrodynamic and transport modeling contain winding navigation channels. Accurate and efficient modeling of flow and suspended sediment transport requires a numerical grid that follows the navigation channel with a fine grid spacing in the channel, while retaining a larger spacing in the remainder of the field. A computer program called WESCORA has been developed to enable the numerical computation of such boundary-fitted grids for use in the finite difference modeling of flow and constituent fields. Two adaption mechanisms are included, one based on a variational principle and the other based on control functions, with the former being apparently the more consistent and reliable. With the variational approach, a functional that consists of the sum of three integrals involving the physical coordinates is minimized over the grid. The first of the integrals controls grid point concentration by forcing the grid points to cluster where the water depth is large, i.e., in navigation channels. The other two integrals control grid smoothness, i.e., the rate of change of grid spacing and the skewness of the coordinate lines. By weighting the importance of the three integrals, either grid point concentration, grid smoothness, or orthogonality can be emphasized. Mathematical aspects of the grid generation equations and the interpolation schemes employed for the water depths are discussed. In addition, example grids generated on Chesapeake Bay are presented.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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