Usuario:Atila rey/pruebas/Simulación de fluidos
Simulación de fluidos es una herramienta en los gráficos por computador para generar animaciones realistas del agua, humo, explosiones, y fenómenos relacionados. Dado una cierta configuración de entrada del líquido y de la geometría de la escena, un simulador de fluidos desarrolla el movimiento del fluido en el tiempo, haciendo uso (posiblemente muy simplificado) de las ecuaciones de Navier-Stokes, que describen la física de fluidos. En los gráficos por computador, tales simulaciones varían en complejidad desde animaciones de alta calidad para efectos especiales y el cine, que consumen una enorme cantidad de tiempo, a simples sistemas de partículas en tiempo real utilizados en los juegos modernos.
Aproximaciones[editar]
There are several competing techniques for liquid simulation with a variety of trade-offs. The most common are Eulerian grid-based methods, smoothed particle hydrodynamics (SPH) methods, vorticity-based methods, and Lattice Boltzmann methods. These methods originated in the computational fluid dynamics community, and have steadily been adopted by graphics practitioners. The key difference in the graphics setting is that the results need only be plausible. That is, if a human observer is unable to identify by inspection whether a given animation is physically correct, the results are sufficient, whereas in physics, engineering, or mathematics, more rigorous error metrics are necessary.
Hay varias técnicas que compiten para la simulación de líquidos con distintas ventajas. Los más comunes son métodos basados en matrices de Euler, hidrodinámica suavizada de partícula (SPH) métodos, métodos vorticidad-basados, y [[métodos de Boltzmann del enrejado
Development[editar]
In computer graphics, the earliest attempts to solve the Navier-Stokes equations in full 3D came in 1996, by Nick Foster and Dimitris Metaxas, who based their work primarily on a classic CFD paper from 1965 by Harlow & Welch. Prior to this, many methods were built on ad-hoc particle systems, lower dimensional techniques such as 2D shallow water models, and semi-random turbulent noise fields. In 1999, Jos Stam published the so-called Stable Fluids method at SIGGRAPH, which exploited a semi-Lagrangian advection technique and implicit integration of viscosity to provide unconditionally stable behaviour. This allowed for much larger time steps and in general, faster simulations. This general technique was extended by Fedkiw & collaborators to handle complex 3d water simulations using the level set method in papers in 2001 and 2002.
Some notable academic researchers in this area include Ron Fedkiw, James F. O'Brien, Mark Carlson, Greg Turk, Robert Bridson, Ken Museth and Jos Stam.
Software[editar]
Several options are available for fluid simulation in off-the-shelf 3D packages. A popular open source package is Blender 3d, with a stable Lattice Boltzmann method implemented. Another option is Glu3d, a plugin for 3ds Max very similar to Blender's fluid capability. Other options are RealFlow, FumeFx and AfterBurn for Max, Exotic Matter's Naiad, Dynamite for LightWave 3D, ICE SPH Fluids for Softimage; Turbulence.4D, PhyFluids3D, DPIT for Cinema 4D. Houdini supports fluids natively.
Véase también[editar]
Portal:Computer graphics. Contenido relacionado con Computer graphics.- Blender 3d
- Cinema 4D
- Glu3d
- LightWave 3D
- Softimage
- Houdini
- RealFlow
- Maya Fluids (integrated Navier Stokes solver in Autodesk Maya)
