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Showing 1 to 20 of 33 for “"Unstructured Grid"”.
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Towards Improvement of Numerical Accuracy for Unstructured Grid Flow Solver
… the numerical accuracy of a three dimensional unstructured grid finite volume scheme is pursued in the present work. Unstructured grid methods have been widely used in computational fluid dynamics for the convenience of modeling complex geometries in realistic applications. In the present work, …
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Unstructured grid simulations of shocks and detonations in two-phase flows
… monotonic compressible flow solver with an unstructured, adaptive mesh was used as the basis for code development. This flow solver incorporated the Finite Element Method-Flux Corrected Transport scheme, which has shown excellent predictive capability of various compressible flows which …
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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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The unstructured grid incompressible Navier-Stokes algorithm for convective heat transfer based on artificial compressibility
The development of an explicit unstructured grid finite-volume scheme for solving the full incompressible Navier-Stokes equations along with the energy equation in a strongly coupled manner is presented. The Boussinesq approximation is utilized to account for thermal buoyancy. The method of …
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A control volume unstructured grid approach to the solution of the elastic stress-strain equations
… based upon a control volume approach on unstructured meshes. The purpose is to integrate the solution of solid mechanics with that of fluid flow and heat transfer within the context of solidification problems in the casting of metals. The conventional way of solving stress-strain problems …
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Reynolds-Averaged Navier-Stokes Computation of Tip Clearance Flow in a Compressor Cascade Using an Unstructured Grid
A three-dimensional unstructured incompressible RANS code has been developed using artificial compressibility and Spalart-Allmaras eddy viscosity model. A node-based finite volume method is used in which all flow variables are defined at the vertices of tetrahedrons in an unstructured grid. The …
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Hamiltonian Paths and Strands for Unified Grid Approach for Computing Aerodynamic Flows
… algorithm using Hamiltonian paths and strand grids is presented for compressible Reynolds-Averaged Navier–Stokes (RANS) formulation as a unified grid approach. The hidden line-structure is robustly identified on the general unstructured grid with mixed elements which provides a framework for …
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Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations
… work. For the first step, a three-dimensional unstructured grid approach to aerodynamic shape sensitivity analysis and design optimization has been developed. The advantage of unstructured grids, when compared with a structured-grid approach, is their inherent ability to discretize irregularly …
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An Efficient Storage And Retrieval Mechanism For Large Unstructured Grids
… on large multidimensional arrays. In contrast, unstructured grids consisting of collections of implices (e.g. triangles or tetrahedra) present special challenges that have received less attention. Data values found at the vertices of the simplices may be dispersed throughout a datafile, …
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An a posteriori error control framework for adaptive precision optimization using discontinuous Galerkin finite element method
… of problems. In the context of structured grids, adjoint-based applications include multipoint, multi-objective airfoil design using compressible Navier-Stokes equations and 3D multipoint design of aircraft configurations using inviscid Euler equations. There have also been significant …
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A numerical investigation of compressible flow in a curved S-duct
… Reynolds-averaged Navier-Stokes equations on an unstructured grid in three spatial dimensions. Results are compared to existing experimental steady-state data to validate the computed solutions. Effects of grid resolution, including boundary layer spacing and localized refinement are considered …
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Automatic, Unstructured Mesh Generation for 2D Shelf Based Tidal Models
… a domain in what is referred to as a mesh or unstructured grid as the computational basis for calculations. The density of elements in a mesh affects the numeric stability of a model when performing computations. Furthermore, these meshes can be difficult and time consuming to create. This …
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Surface Curvature and Roughness Effects on Görtler Vortex Development in Hypersonic Flow
… performed for two curvature cases using US3D, an unstructured-grid finite volume computational fluid dynamics (CFD) solver. Experiments were performed on two curvature cases and three roughness element shapes at the University of Texas at San Antonio (UTSA) Mach 7 Ludwieg tube wind tunnel …
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Validation of interpolative interfaces for rotorcraft applications
… The ROBIN model and the rotor are run using an unstructured grid. Results from the Tenasi flow solver are compared against both simulated and wind tunnel data. Tenasi is an unstructured, Reynolds Averaged Navier-Stokes (RANS) solver developed at the SimCenter: National Center for Computational …
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Study of Thermochemical Non-equilibrium and Sensor Cavity Geometry in Hypersonic Flow
… used to model three 3D geometries in US3D, an unstructured-grid finite volume computational fluid dynamics (CFD) solver. The three investigated geometries are a flat plate with a flush-mounted sensor, an open cavity with a length-to-depth ratio of 2, and a closed cavity with a length-to-depth …
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Mesh generation by domain bisection
… of automatically generating three dimensional unstructured tetrahedral meshes. The work on two dimensional triangular unstructured grid generation by Lewis and Robinson [LeR76] is first examined, in which a recursive bisection technique of computational order nlog(n) was implemented. This …
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Modeling coupled physics and biology in ocean straits
… numerical model is created on a structured grid using operator splitting and masking. This model is able to accurately represent biology for various physical flows, including advection-dominated flows over discontinuities, by using the Weighted Essentially Non-Oscillatory (WENO) scheme. The …
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Finite element analysis of flows in secondary settling tanks
… it is nowadays also possible to realise an unstructured grid within the FVM, the power of the finite element method (FEM) lies in its higher flexibility in fitting irregular domains and in providing local grid refinement. Generally, unstructured mesh procedures with the FVM require …
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Generalized spatial discretization techniques for space-marching algorithms
… the current and future availability of unstructured grid generation techniques. The first discretization employs a generalized indexing strategy utilizing triangular elements in the two dimensions normal to the streamwise direction, while maintaining structure within the streamwise …
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