文章基本信息

标题：Comparative Study Of Convergence Of CfdCommercial Codes When Simulating Dense Underflows
本地全文：下载
作者：Fabián A. Bombardelli ; Mariano I. Cantero ; Gustavo C. Buscaglia 等
期刊名称：Mecánica Computacional
印刷版ISSN：2591-3522
出版年度：2004
卷号：XXIII
期号：12
页码：1187-1200
出版社：CIMEC-INTEC-CONICET-UNL
摘要：In this paper, we present numerical simulations of saline, discontinuous density currents,
in two and three dimensions. The simulation of these flows poses a severe challenge for all codes. In
fact, the currents present characteristic flow instabilities at the interface which are constituted by
small spatial scales. A very fine resolution of these scales is needed to adequately capture the
instabilities.
The two-dimensional simulations reported herein were performed with two CFD codes. The first one
is a comprehensive finite-element platform, whereas the other one is a commercial code. The runs
were undertaken under quite similar conditions. Simulations show that only when the mesh employed
in the commercial code is strongly refined a convergent solution is attained, which is similar to the
solution obtained with the finite-element CFD code. This result would warn about the indiscriminate
use of commercial codes with supposedly “fine” meshes when simulating complex underflows. The
solution with the finite-element code, in turn, shows the shedding of large vortices containing salt.
These vortices do not have a physical basis, but they correspond to the true solution of the twodimensional
Navier-Stokes Equations.