An unsteady two-dimensional finite-volume solver was developed based on Van Leer’s flux splitting algorithm in conjunction with “Monotonic Upstream Scheme for Conservation Laws (MUSCL)” limiters to improve the order of accuracy and the two-layer Baldwin-Lomax turbulence model was also implemented. Two test cases were prepared to validate the solver. The computed results were compared with the e...

In this work we show some results about the reduced basis approximation of advection dominated parametrized problems, i.e. advection-diffusion problems with high Péclet number. These problems are of great importance in several engineering applications and it is well known that their numerical approximation can be affected by instability phenomena. In this work we compare two possible stabilizat...

In this paper, we describe a comparison of two spatial discretization schemes for the advection equation, namely the first finite difference method and the method of lines. The stability of the methods has been studied by Von Neumann method and with the matrix analysis. The methods are applied to a number of test problems to compare the accuracy and computational efficiency. We show that both d...

Abstract Hydrographic surveys have revealed that the Yellow River plume propagates in direction opposite to of a Kelvin wave (upstream) under low river discharge condition, but turns downstream as increases. A numerical model reproduced upstream extension condition and transition high confirmed summer wind is not necessary for plume. With discharge, also indicated dependence on tidal range: ext...

In this work we propose a new Eulerian method for handling dynamics of liquids and their surface textures. Our approach is based on a new method for interface advection we term the Marker Level Set (MLS). The MLS method uses surface markers and a level set for tracking the surface of the liquid, achieving more efficient and accurate results than popular methods like the Particle Level Set metho...

IMEX partitioning may be based on a decomposition of the computational domain into two subgrids by implicitly discretizing unknowns smallest cells while explicit time stepping is applied to moderately sized elements. Alternatively, advection-diffusion splitting applies implicit discretization only viscous terms inviscid are discretized explicitly. Analytical investigations have shown that caref...

Biogeography studies that correlate the observed distribution of organisms to environmental variables are typically based on local conditions. However, in cases with substantial translocation, like planktonic organisms carried by ocean currents, selection may happen upstream and local environmental factors may not be representative of those that shaped the local population. Here we use an indiv...

The spatial and temporal distributions of sea surface temperature (SST) anomalies in the Antarctic Circumpolar Current (ACC) are investigated, using monthly data from the NCEP–NCAR reanalysis for the period 1980–2004. Patterns of atmospheric forcing are identified in observations of sea level pressure and air–sea heat fluxes. It is found that a significant fraction of SST variability in the ACC...

A model, based on ozone-concentration tendency equation, is developed to study synoptic ozone-column variations. The application is referred to a middle-latitude site and to an atmospheric layer extending from the surface up to about 35-km altitude. Photochemical effects at the considered location for synoptic time scales are considered negligible. The data input consists of umkehr ozone profil...