A singular finite element for Stokes flow: The stick–slip problem
Georgiou, Georgios C.; Olson, Lorraine Gail; Schultz, William W.; Sagan, Susan
1989-11
Citation
Georgiou, Georgios C.; Olson, Lorraine G.; Schultz, William W.; Sagan, Susan (1989)."A singular finite element for Stokes flow: The stick–slip problem." International Journal for Numerical Methods in Fluids 9(11): 1353-1367. <http://hdl.handle.net/2027.42/50199>
Abstract
Abrupt changes in boundary conditions in viscous flow problems give rise to stress singularities. Ordinary finite element methods account effectively for the global solution but perform poorly near the singularity. In this paper we develop singular finite elements, similar in principle to the crack tip elements used in fracture mechanics, to improve the solution accuracy in the vicinity of the singular point and to speed up the rate of convergence. These special elements surround the singular point, and the corresponding field shape functions embody the form of the singularity. Because the pressure is singular, there is no pressure node at the singular point. The method performs well when applied to the stick–slip problem and gives more accurate results than those from refined ordinary finite element meshes.Publisher
John Wiley & Sons, Ltd
ISSN
0271-2091 1097-0363
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