TY - JOUR
T1 - Numerical aspects of the simulation of discontinuous saline underflows
T2 - The lock-exchange problem
AU - Bombardelli, Fabian A.
AU - Cantero, Mariano I.
AU - Garcia, Marcelo H.
AU - Buscaglia, Gustavo C.
N1 - Funding Information:
We gratefully acknowledge the support of the Coastal Geoscience Program of the Office of Naval Research (ONR), the Chicago District of the U.S. Army Corps of Engineers (USACE), and the Metropolitan Water Reclamation District of Greater Chicago (MWRD) awarded to Marcelo García. Support from the NCSA at UIUC is also acknowledged. Mariano Cantero was supported by a Graduate Student Fellowship from the Computer Science and Engineering Program at UIUC. Gustavo Buscaglia acknowledges partial financial support from CNPq and FAPESP (Brazil). This research was completed thanks to the University of California Start-up Funds awarded to Fabián Bombardelli. The first author thanks Mr. Sanjeev Jha and Dr. Andrea González for useful comments on the paper.
PY - 2009
Y1 - 2009
N2 - Issues associated with the adequate representation of flow instabilities of saline, discontinuous density currents in two and three dimensions are discussed. First, simulations of the experiments by Alahyari and Longmire ( 1996) developed with an advanced commercial code are presented, and they are compared with results obtained through Direct Numerical Simulation of the problem. Various meshes and turbulence models are then tested with the commercial code, including a Large Eddy Simulation. The features of the density current that are not reproduced well by the simulations with the commercial code are further analyzed. Then, two-dimensional numerical simulations of an unpublished set of experiments are presented. The response of commercial and open-source codes to different grids is addressed. Important conclusions on the risks of using inadequate resolution with codes in which not all variables are controlled are obtained, and the nature of these two-dimensional, "mathematical" numerical solutions is discussed.
AB - Issues associated with the adequate representation of flow instabilities of saline, discontinuous density currents in two and three dimensions are discussed. First, simulations of the experiments by Alahyari and Longmire ( 1996) developed with an advanced commercial code are presented, and they are compared with results obtained through Direct Numerical Simulation of the problem. Various meshes and turbulence models are then tested with the commercial code, including a Large Eddy Simulation. The features of the density current that are not reproduced well by the simulations with the commercial code are further analyzed. Then, two-dimensional numerical simulations of an unpublished set of experiments are presented. The response of commercial and open-source codes to different grids is addressed. Important conclusions on the risks of using inadequate resolution with codes in which not all variables are controlled are obtained, and the nature of these two-dimensional, "mathematical" numerical solutions is discussed.
KW - Computational fluid dynamics
KW - Dense underflows
KW - Density currents
KW - Lock-exchange flows
KW - Navier-stokes equations
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U2 - 10.3826/jhr.2009.3238
DO - 10.3826/jhr.2009.3238
M3 - Article
AN - SCOPUS:76149083280
SN - 0022-1686
VL - 47
SP - 777
EP - 789
JO - Journal of Hydraulic Research
JF - Journal of Hydraulic Research
IS - 6
ER -