0404×1061.0404×106 degrees of freedom) at late times. At Re=2800Re=2800, M2M2-mid uses an average of 3.2×1043.2×104 vertices which increases to 4.3×1044.3×104 vertices at Re=4300Re=4300. In terms of degrees of freedom (which given the control volume discretisation for temperature and P1 basis functions for pressure and velocity

is the equivalent to the number of vertices for the Fluidity-ICOM simulations), this places M2M2-mid between the Özgökmen et al. (2007) (second) low-resolution and (first) mid-resolution Selleckchem CHIR 99021 benchmark simulations (1.08×1041.08×104 and 7.68×1047.68×104 degrees of freedom, respectively). However, the M2M2-mid mixed water mass volume fractions agree well with the higher resolution Özgökmen et al. (2007) simulations which have one to two orders of magnitude more degrees of freedom. This again highlights the good performance of the adaptive mesh simulations that use the metric M2M2. Simulations of the two-dimensional

lock-exchange performed with Fluidity-ICOM on fixed and adaptive meshes have been evaluated primarily by comparison of the diapycnal mixing quantified through the background potential energy perturbation, Section 4.1. The diffusion term is neglected and, therefore, www.selleckchem.com/products/ch5424802.html any diffusion is considered numerical. Values from simulations on the fixed meshes are taken as the benchmark for comparison, with the diapycnal mixing decreasing as the mesh resolution increases. The progress of the system is categorised into two main stages: the propagation stage, when the gravity currents travel across the domain, and the subsequent oscillatory stage, where the fluid ‘sloshes’ back and forth across the domain, Fig. 2. Four different resolution fixed meshes are considered with horizontal and vertical element edge lengths |v||v| = 0.002, 0.0005, 0.00025 and 0.000125 and are labelled F-coarse, F-mid, F-high1 and F-high2, respectively, Table 2. Three different click here forms of the metric, which guides the mesh adapt, are investigated: the absolute metric, M∞M∞, Eq. (6), the relative metric, MRMR, Eq. (8), and the p

 -metric (with p=2p=2), M2M2, Eq. (10) ( Chen et al., 2007, Castro-Díaz et al., 1997 and Frey and Alauzet, 2005). All meshes adapt to the temperature, horizontal velocity and vertical velocity, Table 3, Table 4 and Table 5. The simulations capture the key dynamics of the lock-exchange, including propagation of the fronts, Kelvin–Helmholtz billows and turbulent mixing. The adaptive mesh simulations with M∞M∞ and M2M2 use, in general, a comparable number of vertices to the coarsest resolution fixed mesh, F-coarse, and one to two orders of magnitude fewer vertices than F-high1 and F-high2, Fig. 8. The number of vertices for simulations that use MRMR is more comparable to fixed mesh simulation F-mid. The simulations that use M2M2 produce the best performance, Fig. 8.