We present a new scenario for the formation of cool cores in rich galaxy clusters based on results from recent high spatial dynamic range, adaptive mesh Eulerian hydrodynamic simulations of large-scale structure formation. We find that cores of cool gas, material that would be identified as a classical cooling flow based on its X-ray luminosity excess and temperature profile, are built from the...

This paper presents an efficient method for the dynamic simulation of inextensible cloth. The triangle mesh for our cloth model is simulated using an impulse-based approach which is able to solve hard constraints. Using hard distance constraints on the edges of the triangle mesh removes too many degrees of freedom, resulting in a rigid motion. This is known as the locking problem which is typic...

This paper extends the hierarchical radiosity method to environments in which geometry and surface attributes can be changed dynamically. New algorithms are presented for maintaining an appropriately-sized mesh and speeding the construction of the corresponding linear system. Mesh folding, the unrefinement of a mesh, is used to optimize mesh size while maintaining a specified error tolerance. T...

We present adaptive preconditioners for parallel, time-dependent simulations and nonlinear optimization problems with dynamic mesh adaptation. Adaptive meshing greatly reduces the computational cost of simulations and optimization. Unfortunately, it also carries a number of problems for preconditioning in iterative linear solvers, as changes in the mesh lead to structural changes in the linear ...

Dynamic environments, such as wireless mesh networks, require flexible and self-adaptive mechanisms to control topology and medium access. Conventional algorithms, developed for quite stable networks, either do not work properly in this new environment or perform poorly. This work intends to study and develop dynamic and self-adaptive strategies to control the topology and the medium access for...

The use of 3D shapes in different domains such as in engineering, entertainment, cultural heritage or medicine, is essential for representing 3D physical reality. Regardless of whether the 3D shapes are representing physically or digitally born objects, meshes are a versatile and common representation for the 3D reality. Nonetheless, the mesh generation process does not always produce qualitati...

Wireless mesh networks have attracted increasing attention and deployment as a high-performance and low-cost solution to last-mile broadband Internet access. Traffic routing plays a critical role in determining the performance of a wireless mesh network. To investigate the best routing solution, existing work proposes to formulate the mesh network routing problem as an optimization problem. In ...

We present a method to reduce mesh bias in dynamic fracture simulations using the fi nite element method withadaptive insertion of extrinsic cohesive zone elements along element boundaries. The geometry of the domaindiscretization is important in this setting because cracks are only allowed to propagate along element facets andcan potentially bias the crack paths. To reduce mesh...

We present Large-Eddy Simulations (LES) of a weakly separated diffuser. The influence of mesh resolution and the choice of subgrid model is investigated. Three resolutions ranging from 1.5 to 6.5 million cells are computed. The influence of the subgrid model is studied on the coarsest mesh using no subgrid model, the standard Smagorinsky model, the dynamic Smagorinsky model and the dynamic loca...

An efficient adaptive moving mesh method for investigation of the semi-classical limit of the focusing nonlinear Schrödinger equation is presented. The method employs a dynamic mesh to resolve the sea of solitons observed for small dispersion parameters. A second order semi-implicit discretization is used in conjunction with a dynamic mesh generator to achieve a cost-efficient, accurate, and st...