2 research outputs found
Simulación de Fluidos en Tiempo Real Usando SPH
Este trabajo presenta las principales caracterÃsticas de una formulación computacional desarrollada por los autores y basada en el método llamado Smoothed Particle Hydrodynamics. La formulación resuelve numéricamente las ecuaciones de Navier-Stokes permitiendo la simulación de dinámica de fluidos, tanto compresibles como casi-incompresibles. El método es simple, explÃcito, computacionalmente rápido y apto para la computación en paralelo. Estas caracterÃsticas, junto con el empleo de técnicas avanzadas de computación y visualización han sido utilizadas para el desarrollo de una plataforma de simulación virtual de dinámica de fluidos con la que se puede cambiar interactivamente propiedades fÃsicas del fluido, condiciones de contorno como el movimiento de paredes o la aparición de fuerzas externas, asà como también parámetros del método computacional (nivel de viscosidad artificial, tipo de integrador temporal, etc.). La mencionada interacción con el usuario ocurre en tiempo real y mientras transcurre la simulación. La velocidad de cómputo y la capacidad de interacción permiten resolver problemas de manera dinámica y con mayor rápidez, aprovechando que se puede ver y estudiar en tiempo real la respuesta del fluido a cambios de diseño o de configuración del problema fÃsico a resolver.Fil: Rojas Fredini, Pablo Sebastián. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria QuÃmica (i); ArgentinaFil: Limache, Alejandro Cesar. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria QuÃmica (i); Argentin
The application of three-dimensional mass-spring structures in the real-time simulation of sheet materials for computer generated imagery
Despite the resources devoted to computer graphics technology over the last 40 years,
there is still a need to increase the realism with which flexible materials are simulated.
However, to date reported methods are restricted in their application by their use of
two-dimensional structures and implicit integration methods that lend themselves to
modelling cloth-like sheets but not stiffer, thicker materials in which bending moments
play a significant role.
This thesis presents a real-time, computationally efficient environment for simulations
of sheet materials. The approach described differs from other techniques principally
through its novel use of multilayer sheet structures. In addition to more accurately
modelling bending moment effects, it also allows the effects of increased temperature
within the environment to be simulated. Limitations of this approach include the
increased difficulties of calibrating a realistic and stable simulation compared to
implicit based methods.
A series of experiments are conducted to establish the effectiveness of the technique,
evaluating the suitability of different integration methods, sheet structures, and
simulation parameters, before conducting a Human Computer Interaction (HCI) based
evaluation to establish the effectiveness with which the technique can produce credible
simulations. These results are also compared against a system that utilises an
established method for sheet simulation and a hybrid solution that combines the use of
3D (i.e. multilayer) lattice structures with the recognised sheet simulation approach.
The results suggest that the use of a three-dimensional structure does provide a level of
enhanced realism when simulating stiff laminar materials although the best overall
results were achieved through the use of the hybrid model