@Article{CiCP-2-477,
author = {C. Xu and Y. Lin},
title = {A Numerical Comparison of Outflow Boundary Conditions for Spectral Element Simulations of Incompressible Flows},
journal = {Communications in Computational Physics},
year = {2007},
volume = {2},
number = {3},
pages = {477--500},
abstract = {<p style="text-align: justify;">Outflow boundary conditions (OBCs) are investigated for calculation of incompressible flows by spectral element methods. Several OBCs, including essential-type, natural-type, periodic-type and advection-type, are compared by carrying out a
series of numerical experiments. Especially, a simplified form of the so-called Orlanski&#39;s OBCs is proposed in the context of spectral element methods, for which a new
treatment technique is used. The purpose of this paper is to find stable low-reflective
OBCs, suitable and flexible for use of spectral element methods in simulation of incompressible flows in complex geometries. The computation is firstly carried out for
a 2D simulation of Poiseuille-Bénard channel flow with Re=10, Ri=150 and Pr=2/3.
This flow serves as a useful example to demonstrate the applicability of the proposed
OBCs because it exhibits a feature of vortex shedding propagating through the outflow boundary. Then a 3D flow around an obstacle is computed to show the efficiency
in the case of more general geometries. Among the tested OBCs, the advection-type
OBCs are proven to have better behavior as compared with the others.</p>},
issn = {1991-7120},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/cicp/7914.html}
}