This paper describes an algorithm to extract adaptive and quality quadrilateral/hexahedral meshes directly from volumetric imaging data. First, a bottom-up surface topology preserving octree-based algorithm is applied to select a starting octree level. Then the dual contouring method is used to extract a preliminary uniform quad/hex mesh, which is decomposed into finer quads/hexes adaptively wi...

A novel residual a posteriori error estimator for the Oseen equations achieves efficiency and reliability by including multilevel contributions in its construction. Originates from Multiscale Hybrid Mixed (MHM) method, combines residuals skeleton of first-level partition domain, along with element-wise approximations. The second-level is local infers accuracy multiscale basis computations as pa...

In this paper, we present a novel process of creating hexahedral meshes for the turbomachinery secondary air system. The meshing process is automated from the geometry import to the mesh setup and requires minimum human interventions. The core of the process is a hexahedral meshing algorithm with a boundary layer mesh automatically created. The hex meshing algorithm combines the pave-sweep, gen...

Uintah is a software framework that provides an environment for solving fluid-structure interaction problems on structured adaptive grids on large-scale science and engineering problems involving the solution of partial differential equations. Uintah uses a combination of fluid-flow solvers and particle-based methods for solids, together with adaptive meshing and a novel asynchronous task-based...

Currently the focus of research and development effort for new meshing technology is on developing new algorithms for meshing. As a result of this some successful meshing algorithms have emerged, but true automeshing is still elusive. The generation of a meshed model ready for analysis is more involved than merely creating elements. Solid models created in CAD systems often need to be processed...

This paper presents an object-oriented approach for creating multi-region non-manifold models with NURBS. The main motivation is that the geometry and shape of realistic engineering objects are intrinsically complex, usually composed by several materials and regions. Therefore, automatic and/or adaptive meshing algorithms have become revealed themselves quite useful to increase the reliability ...

We present our computational method for binary alloy solidification which takes advantage of high performance computing where up to 1024 cores are employed. Much of the simulation at a sufficiently fine resolution is possible on a modern 12 core PC and the 1024 core simulation is only necessary for very mature dendrite and convergence testing where high resolution puts extreme demands on memory...

The eecient solution of transient CFD problems on distributed memory computers requires the use of parallel adaptive meshing. We will discuss issues arising in the parallelisation of a general-purpose, unstructured, tetrahedral adaptivity code. In particular, we will consider data-structure issues such as communications links and the parallelisation of complex hierarchical data-structures. We w...