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The implementation of normal and/or tangential boundary conditions in finite element codes for incompressible fluid flow
Author(s) -
Engelman M. S.,
Sani R. L.,
Gresho P. M.
Publication year - 1982
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.1650020302
Subject(s) - boundary (topology) , finite element method , domain (mathematical analysis) , mathematics , compressibility , boundary knot method , incompressible flow , boundary value problem , mathematical analysis , singular boundary method , geometry , boundary conditions in cfd , flow (mathematics) , boundary element method , mixed boundary condition , mechanics , physics , robin boundary condition , engineering , structural engineering
Various techniques for implementing normal and/or tangential boundary conditions in finite element codes are reviewed. The principle of global conservation of mass is used to define a unique direction for the outward pointing normal vector at any node on an irregular boundary of a domain containing an incompressible fluid. This information permits the consistent and unambiguous application of essential or natural boundary conditions (or any combination thereof) on the domain boundary regardless of boundary shape or orientation with respect to the co‐ordinate directions in both two and three dimensions. Several numerical examples are presented which demonstrate the effectiveness of the recommended technique.