China
Africa
Explore chapters and articles related to this topic
Flood Modeling Using Open-Source Software
Published in Saeid Eslamian, Faezeh Eslamian, Flood Handbook, 2022
Thomas J. Scanlon, Saeid Eslamian
Following the generation of the DEM, a new 2D mesh is created which covers the same computational area as the 3D one. The 2D mesh is generated using the combined OpenFOAM utilities blockMesh, which creates an orthogonal, structured mesh, and snappyHexMesh, which creates an unstructured polyhedral mesh. The OpenFOAM utility extrudeMesh is then employed to generate a 2D mesh with “empty” patch types at the top and bottom surfaces. Such “empty” patches are necessary to force the OpenFOAM solution to be two-dimensional in nature. It is also at this stage that additional STL files may be incorporated into the 2D model to provide, for example, zones of different surface roughness for rivers, woodland, grassland, buildings, etc. – see Case 4 for an example of this. Finally, the digital elevations are mapped from the 3D solution onto the 2D mesh using the OpenFOAM utility mapFields. The solver shallowFoam is then ready to be run, taking advantage of OpenFOAM's unlimited parallel processing capability. Post-processing is via the open-source visualization application Paraview which is supplied with OpenFOAM.
Technology CAD Tools
Published in Chinmay K. Maiti, Introducing Technology Computer-Aided Design (TCAD), 2017
GARAND has 3D drift-diffusion, Monte Carlo, and quantum transport simulation engines. All simulation engines can simulate identical simulation domains, including, individually or in combination, all statistical variability sources supported by GARAND. The 3D drift-diffusion simulation engine provides accurate results for the statistical variability in the subthreshold region, including threshold voltage and leakage variability. The 3D Monte Carlo simulation engine includes accurate density gradient quantum corrections and ab initio scattering from ionized impurities and interface roughness, essential to simulate accurately the on-current variability. The 3D NEGF quantum transport simulator is essential in sub-10 nm transistors with a current component arising from direct source-to-drain tunneling. It includes also ab initio scattering from ionized impurities and interface roughness, as well as phonon scattering. The visualization modules in GARAND are based on Paraview and include graphing, statistical, and 3D modules.
The Visualization Pipeline
Published in Alexandru Telea, Data Visualization, 2014
A slightly different type of visual application builder is illustrated in Figure 4.9 by the ParaView environment [Henderson 04]. Similar to VISSION and MeVisLab in that they all use the VTK library and its underlying machinery to provide the actual implementation of visualization operations, ParaView features a more beginner-friendly end-user interface. The freedom of constructing application networks of fully general graph topology by visual programming (present in MeVisLab, AVS, or VISSION) is traded in ParaView for a simpler application-building process using conventional GUI menus that is easier and faster to learn and use. A similar trade-off of design freedom for utilization simplicity is used in other toolkits, such as MayaVi [MayaVi 13].
Toward an In-Depth Material Model for Cermet Nuclear Thermal Rocket Fuel Elements
Published in Nuclear Technology, 2021
William C. Tucker, Piyas Chowdhury, Lauren J. Abbott, Justin B. Haskins
To evaluate the mechanical response and failure initiation of polycrystalline microstructures, the Dusseldorf Advanced Material Simulation Kit28 (DAMASK) is employed. In contrast to VASP’s atomic-scale simulations, DAMASK is a highly modular freeware code for modeling materials structure-property relationships at the grain/micron scale with different types of mechanistic constitutive laws and numerical solvers. It is designed to accurately correlate microscopic phenomena (e.g., plastic deformation, phase transformation, hydrogen embrittlement, microcracking, or irradiation damage) with macroscale responses. For the present work, DAMASK is employed to study the microscopic damage evolution in tungsten under the operating conditions of NTP. Microstructures with 20 grains of an average diameter of 20 μm, representative of the typical grain size of additively manufactured tungsten,29 were generated randomly on a 120 × 120 × 120 cubic voxel grid via Voronoi tessellation. The stress/strain response was then calculated based on a relevant set of mechanical properties.30 Visualization and post processing were performed using ParaView.31
Development of a CFD model and procedure for flows through in-stream structures
Published in Journal of Applied Water Engineering and Research, 2022
Yong G. Lai, David L. Smith, David J. Bandrowski, Yuncheng Xu, Christa M. Woodley, Kaitlin Schnell
Besides a CFD solver, a CFD package should also include a mesh generator and a post-processor. The post-processor is to graphically view and analyze the model results. In this study, the open-source ParaView is used (downloadable from its website). ParaView is a multi-platform data analysis and visualization tool developed initially through a collaborative effort between Kitware Inc. and Los Alamos National Laboratory, and later by multiple agencies. The CFD solver U2RANS writes results to a file that may be loaded into ParaView for visualization and analysis.
An experimental study on oscillatory characteristics of young mangroves behind a portable reef
Published in Coastal Engineering Journal, 2023
Sindhu Sreeranga, Hiroshi Takagi, Shin-Ichi Kubota, Jun Mitsui
Post-processing was performed using ParaView, an open-source software for data processing and visualization. Simulated wave data were collected in the same location as the physical wave gauges (CH1–CH4). The time-series data were analyzed using the same method as the experimental data.