NOTE ON OPEN BOUNDARY CONDITIONS FOR ELLIPTIC FLOWS
- 1 October 1990
- journal article
- research article
- Published by Taylor & Francis in Numerical Heat Transfer, Part B: Fundamentals
- Vol. 18 (2) , 243-256
- https://doi.org/10.1080/10407799008944952
Abstract
Four different open (outflow) boundary conditions are compared and evaluated by using the incompressible PoiseuillelBenard flow in a two-dimensional rectangular duel as a test case. The conditions are: simple upwinding, linearly and quadratically weighted upwinding, and vanishing of a linearized convective derivative. The upwinding conditions generate significant reflection of outgoing waves back into the computational domain, while the convective condition presents little reflection. This last condition, which is a Sommerfeld-type radiation condition, is recommended for use at boundaries where a net outflow of fluid occurs.Keywords
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