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Showing 1 to 19 of 19 for “"Numerical grid generation (Numerical analysis)"”.
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Advances in parallel overset domain asembly
… Dynamics) community has long used the Overset Grid method to enable dynamic simulations with bodies in relative motion. In Overset simulations, information is transferred between overlapping grids via interpolation. Domain Assembly is the process that governs the location of intergrid …
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A fault tolerant grid generation technique
Automatic and parallel mesh generation has been highlighted as a bottleneck for large scale automated Computational Fluid Dynamics analysis. The desire for large scale automated CFD is driven by the growing computational capabilities in large scale supercomputers. Unfortunately, as compute clusters …
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A new software framework for unstructured mesh representation and manipulation
… are presented. Scalability results and analysis are included.
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The development of an all quadrilateral boundary conforming grid generator for high order finite element methods
A grid generator is developed that produces all quadrilateral meshes. The scheme is automated to work for arbitrary choice of geometry. In addition, a Non-Uniform Rational B-Spline curve fitter is implemented to replicate the curvature of the geometries. The grid elements on the boundaries conform …
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Fully anisotropic split-tree adaptive refinement mesh generation using tetrahedral mesh stitching
… on, the need for a robust Cartesian Mesh Generation algorithm is paramount. Not only do Cartesian meshes require less elements and often help resolve flow features but they also allow the grid generator to have a great deal of control in so far as element aspect ratio, size, and gradation. …
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Tetrahedral mesh optimization and generation via topological transformations and gradient based node perturbation
… created by third-party software as well as a grid generation methodology created for this work. The particular algorithms involved are explained in detail including, an explication of the primary optimization metric, weighted condition number. In addition, a thorough literature review …
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Automatic mesh representation of urban environments
A robust watertight mesh generation framework for urban cityscape and waterscape is proposed. The framework, consisting of a set of algorithms implemented in MATLAB, uses geospatial data available from OpenStreetMap and United States Geological Survey repositories, and incorporates Triangle - a …
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Higher order mesh curving using geometry curvature extrapolation
A higher order mesh curving method is developed which uses information from the geometry to determine the appropriate curvature of edges in the interior of the mesh. Edges are represented using four point Bézier curves to determine the positions of higher order edge points. Higher order face and …
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Linear elastic mesh deformation via localized orthotropic material properties optimized by the adjoint method
The finite element method has been shown to be a powerful tool in computational engineering with recent application to electromagnetics and fluid dynamics. However, achieving the high orders of accuracy easily available to the finite element method has proven difficult due to conforming …
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Automatic parallel octree grid generation software with an extensible solver framework and a focus on urban simulation
… parallel, Cartesian, linear forest-of-octree grid generator and partial differential equation (PDE) solver framework is presented. This research is bundled into an application programmed with C++ which uses MPI for distributed parallelism. The application is named paros which stands for …
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Generation and optimization of spacing fields
Meshes are used to discretize space for computational fluid dynamics (CFD) simulations. Mesh adaptation through refinement and smoothing can improve the accuracy of the CFD solution. In order to perform adaptive refinement or smoothing a spacing field is needed to define the desired edge sized in …
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An adaptive hybrid mesh generation method for complex geometries
An adaptive hybrid mesh generation method is described to automatically provide spatial discretizations suitable for computational fluid dynamics or other 2D solver applications. This method employs a hierarchical grid generation technique to create a background mesh, an extrusion-type method for …
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Unstructured grid technologies for hydrodynamic applications with bodies in relative motion and mesh deformation
Unstructured grid technologies for hydrodynamic applications with bodies in relative motion and mesh deformation are presented. A parallel universal mesh deformation scheme is developed to manage deforming surface and volume grids for both aerodynamic and hydrodynamic applications. The approach is …
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Comparison of two methods for two dimensional unstructured mesh adaptation with elliptic smoothing
A new mesh adaptation method for unstructured grids is presented. The technique uses virtual control volumes that are iteratively manipulated to conform the mesh to match either a Riemannianmetric tensor field or an equal distribution of scalar weights. Forcing functions similar to those used for …
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Mesh generation using a correspondence distance field
… two main applications to two-dimensional mesh generation are presented with extension to three-dimensional capabilities in mind. First is a method for surface-oriented mesh generation from a sufficiently dense set of discrete surface points without connectivity information. Contour levels of …
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Three-dimensional hydrodynamic model set-up: a case study of middle Tennessee River
… research, an automated MATLAB based structured grid generator for EFDC was developed and was tested by developing a test model for Tennessee River near Chattanooga area. The test model was developed for a 9.92 km long segment of the Tennessee River starting from the downstream of the Chickamauga …
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Physics-based point placement by particle dynamics simulation
… approach to point cloud distribution for mesh generation is investigated using inter-nodal attraction and repulsion forces based on the Lennard-Jones pair potential and a simplified particle dynamics simulation. This method produces smooth distributions of points which accurately correspond to …
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Automatic higher order mesh generation and movement utilizing spring-field and vector-adding
… geometry applicable, unstructured curved 2D mesh generation method is developed. Based on this 2D method, an extension to 3D geometries is developed. The methodology of this mesh generation is to provide near-body and off-body meshes by an advancing-layer method to avoid mesh quality problems in …