In micromagnetic simulations it is necessary to compute the effective field associated exchange interaction, which corresponds applying Laplace operator magnetization field. The most widely used approach for computing apply finite-difference schemes homogeneous Cartesian meshes. many situations would be computationally advantageous perform simulation on inhomogeneous meshes, but doing so presen...

Three decades of CA-modelling in the social sciences have shown that the cellular automata framework is a useful tool to explore the relationship between micro assumptions and macro outcomes in social dynamics. However, virtually all CA-applications in the social sciences rely on a potentially highly restrictive assumption, a rectangular grid structure. In this paper, we relax this assumption a...

In this paper, we identify the scalability bottlenecks of an unstructured grid CFD code (PETSc-FUN3D) by studying the impact of several algorithmic and architectural parameters and by examining different programming models. We discuss the basic performance characteristics of this PDE code with the help of simple performance models developed in our earlier work, presenting primarily experimental...

We review the spatial discretization procedure for three high-order, unstructured grid methods recently developed for use within ocean circulation modeling. They are based respectively on spectral finite element and high-order finite volume formulations. We discuss and contrast the three methods in the context of the shallow water equations.

In this paper, we present a numerical model to simulate wind waves and hydrodynamics in the estuary. We employ the unstructured-grid SUNTANS model for hydrodynamics, and within this model we implement a spectral wave model which solves for transport of wave action density with the finite-volume formulation. Hydrodynamics is coupled to the wave field through the radiation stress. Based on the un...

A brief survey of some of the fundamental algorithms in unstructured mesh generation is presented. Included is a discussion and categorization of triangle, tetrahedral, quadrilateral and hexahedral mesh generation methods currently in use in academia and industry. Also included is a brief discussion of smoothing, cleanup and refinement algorithms. An informal survey of currently available mesh ...

Two alternative approaches to the solution of discrete ordinate transport are considered in the context of general unstructured grids. The more traditional approach considered is the solution of a lower triangular system of equations for the spatial intensity distribution. Alternatively, the iterative solution of the system of equations arising from a more general diierencing stencil is also co...

For this poster, the usability of the two most common IO libraries for parallel IO was evaluated, and compared against a pure MPI-IO implementation. Instead of solely focusing on the raw transfer bandwidth achieved, API issues such as data preparation and call overhead were also taken into consideration. The access pattern resulting from parallel IO in unstructured grid applications, which is a...