The Contour-Advective Semi-Lagrangian algorithm
The contour advective semi Lagrangian hybrid algorithm approach to weather forecasting and freely propagating inertia gravity waves in the shallow water system
... 5.3 Conclusion We have revisited one of the standard test cases proposed for the shallow-water equations in spherical geometry using an explicitly PV-conserving contour-advection model. Our results closely ...
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Detecting contour crossings in contour dynamical and contour-advective
... the algorithm that uses equations (1 ) to select pairs of contours took 119 000 seconds of cpu time on a 2200 MHz Pentium Xeon processor to find all contour crossings in the two dimensional turbulence data ...
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A projected Lagrangian algorithm for semi infinite programming
... The method is based on the solution of a sequence of equality constrained quadratic programming problems, and usually has a second order convergence rate.. Numeric[r] ...
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The Lagrangian chemistry and transport model ATLAS: validation of advective transport and mixing
... InsTitute LAgrangian Chemistry/Transport System). Lagrangian (trajectory-based) models have several important advantages over conventional Eulerian (grid-based) models, including the absence of spurious ...
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Semi-Lagrangian methods in air pollution models
... Semi-Lagrangian (SL) methods (Robert, 1981) do not suffer from the traditional advective CFL-condition severely lim- iting the maximum possible length of time step, 1t. These methods have been used ...
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Solving the p -Median Problem with a Semi-Lagrangian Relaxation
... the semi-Lagrangian subproblems relies on sophisticated branch-and-bound schemes, but the remarkable fact is that this solver cannot handle the p-median problems in their initial formulation, unless they ...
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Discontinuous Galerkin semi-Lagrangian method for Vlasov-Poisson
... Obviously, using a directional splitting, higher dimensional models can be envisaged (as in [13]). The exten- sion of higher dimensional Poisson equation is indeed not so trivial (obviously, the present strategy cannot ...
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ATTILA 4.0: Lagrangian advective and convective transport of passive tracers within the ECHAM5/MESSy (2.53.0) chemistry–climate model
... additional clear air turbulence parameterisation, and one for particle displacements parameterising a Monte Carlo diffu- sion approach. One additional pseudo-random number se- ries is used for the initial distribution of ...
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A semi Lagrangian scheme for a modified version of the Hughes’ Model for Pedestrian Flow
... Fig. 2 Density contour lines at time t = 0.3 (left) and t = 1.2 (right). The exits are marked with the letter “E”. In Table 4.1, we show the evacuation time for different values of ε, as well as the percentage of ...
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Convergent semi-Lagrangian methods for the Monge-Ampère equation on unstructured grids
... monotone semi-Lagrangian methods for the resulting Bellman equation on general triangular ...Howard’s algorithm available, which is a glob- ally superlinearly converging semi-smooth Newton ...
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How to predict accurate wavelet grids in adaptive semi-Lagrangian schemes?
... as a grid “transport” algorithm (as this is what T stands for). Indeed, it basically transports wavelet grids along any given smooth flow B, in such a way that the resolutions of any two regions connected by the ...
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Fast Texture Segmentation Based on Semi-local Region Descriptor and Active Contour
... active contour segmentation ...using semi-local image information and tools from differen- tial ...active contour model which distinguishes the background and textures of ...segmentation ...
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A new augmented Lagrangian primal dual algorithm for elastica regularization
... Euler’s elastica as a new regularization of segmentation contour was originally proposed and used in the famous in-depth work by Nitzberg et al 36 Recently, Zhu et al. 34 have developed a numerical method to min- ...
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A high order truly multi-dimensional semi-lagrangian approach for Vlasov simulations
... the semi-Lagrangian discontinuous Galerkin method in time stepping sizes and apply it to the nonlinear Vlasov ...The algorithm with automatic mesh adaptivity is currently under ...Successful ...
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A numerical study of a semi-Lagrangian Parareal method applied to the viscous Burgers equation
... Parareal algorithm leads to fulfilling the convergence criterion after k = 9 ...the advective problem We investigate the influence of the semi-Lagrangian for- mulation on the convergence ...
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Semi lagrangian methods
... Robert, A., 1982: A semi-Lagrangian and semi-implicit numerical integration sche- me for the primitive meteorological equations. Cote, 1991: Semi-Lagrangian integration schemes for [r] ...
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A Semi-Lagrangian Scheme for Advection-Diffusion Equation
... Abstract. This study proposes a semi-Lagrangian scheme for numerical simulation of advection-diffusion equation. The proposed method provides unconditional stability and highly accurate solutions even at ...
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Augmented Lagrangian Algorithm for Hydrothermal Scheduling
... new algorithm for solving hydrothermal scheduling problem with transmission and environmental constraints using Augmented Lagrangian(AL) ...Augmented Lagrangian Relaxation (ALR) ...
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Semi Lagrangian Difference Approximations for Different Conservation Laws
... equation, Semi-Lagrangian approximation, Transport operator, Conservation laws, Stability and ...the semi-Lagrangian approximation depending on the fulfillment of conservation ...
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Spectrogram Track Detection : An Active Contour Algorithm
... high-level algorithm with sufficient information to detect the ...active contour algorithm is sensitive to false positive detections, which can cause a local minimum of the contour’s energy gradient ...
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