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Case A Simulation (left) and Case B simulation (right) showing the particles after 12 hours. The final grid in Case B has 1266 cells.
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Science Applications International Corporation (SAIC) has developed a novel hazardous dispersion model with support from the Defense Special Weapons Agency. The Operational Multiscale Environment model with Grid Adaptivity (OMEGA) is based on an unstructured prismatic grid. OMEGA has the capability to adapt its grid statically as well as dynamicall...
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... and all physical fields were interpolated at each adaptation cycle. Fig. 6 (left) shows the plume at 9 hours into the simulation for the fine grid. The flow is mostly south-westerly. Fig. 6 (right) shows the plume for the adapted grid simulation at the same time. Around nine hours into the simulation the winds shift slightly towards east (see Fig. 7). As the plume shifts the adaptation process follows. Fig. 7 (right) shows the adapted grid at 12 hours into the simulation. The final adapted grid has 1266 cells and the same flow field. the resolution of the final adapted grid varied from 7 km to 38 km. A reduction of over 40 percent in CPU time was achieved in this simulation. ...
Context 2
... cycle. Fig. 6 (left) shows the plume at 9 hours into the simulation for the fine grid. The flow is mostly south-westerly. Fig. 6 (right) shows the plume for the adapted grid simulation at the same time. Around nine hours into the simulation the winds shift slightly towards east (see Fig. 7). As the plume shifts the adaptation process follows. Fig. 7 (right) shows the adapted grid at 12 hours into the simulation. The final adapted grid has 1266 cells and the same flow field. the resolution of the final adapted grid varied from 7 km to 38 km. A reduction of over 40 percent in CPU time was achieved in this simulation. During dynamic adaptation, the coarsening cycle was turned off and cells ...
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Citations
Recibido para revisar marzo de 2008, aceptado octubre 10 de 2008, versión final noviembre 12 de 2008 RESUMEN: Se usó una herramienta numérica para la generación automática de mallas no estructuradas en la implementación del método de los elementos finitos. Las mallas generadas son usadas en el desarrollo de modelos numéricos dos dimensionales (2-D) en la simulación de fenómenos oceánicos. Para ello, se desarrolló un paquete en Matlab basado en el refinamiento triangular no estructurado de Delaunay, complementado por un conjunto de utilidades para chequear y mejorar la calidad de la malla. PALABRAS CLAVE: Generación de mallas, modelación oceánica, Elementos finitos, Refinamiento de mallas, triangulación de Delaunay, Matlab. ABSTRACT: A numerical tool was used for the automatic generation of unstructured meshes in the finite element method implantation. The generated meshes are used in the development of two dimensional (2-D) numerical models in the simulation of oceanic phenomena. For it, a package developed in Matlab based on Delaunay unstructured triangular grid refinement algorithms was used and complemented by a set of diagnostic utilities to check and improve grid quality.
A numerical tool was used for the automatic generation of unstructured meshes in the finite element method implantation. The generated meshes are used in the development of two dimensional (2-D) numerical models in the simulation of oceanic phenomena. For it, a package developed in Matlab based on Delaunay unstructured triangular grid refinement algorithms was used and complemented by a set of diagnostic utilities to check and improve grid quality.
In an unbounded physical domain, simulating a turbulent fluid on an Eulerian grid is rather tricky. Since it is difficult to predict the motion of the fluid, it is also difficult to guess which computational domain would allow the simulation of the fluid without crossing the computational boundaries. To address this dilemma, we have developed a novel adaptive framework where the simulation grid follows the motion of the flow. Our technique is based on the principle of Galilean Invariance and the culling of simulation cells using a metric derived from continuative boundary conditions. We describe our framework and showcase its advantages over traditional techniques. Timing results and visual comparisons are presented.
Se usó una herramienta numérica para la generación automática de mallas no estructuradas en la implementación del método de los elementos finitos. Las mallas generadas son usadas en el desarrollo de modelos numéricos dos dimensionales (2-D) en la simulación de fenómenos oceánicos. Para ello, se desarrolló un paquete en Matlab basado en el refinamiento triangular no estructurado de Delaunay, complementado por un conjunto de utilidades para chequear y mejorar la calidad de la malla.
