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Fluid simulation method based on video reconstruction and eulerian model coupling

A fluid simulation and video technology, applied in the field of computer graphics, can solve problems such as loss of fluid details, and achieve the effect of improving realism

Active Publication Date: 2017-08-22
EAST CHINA NORMAL UNIV
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  • Description
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Problems solved by technology

However, due to equipment and environmental constraints, some details of the fluid may be lost

Method used

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  • Fluid simulation method based on video reconstruction and eulerian model coupling
  • Fluid simulation method based on video reconstruction and eulerian model coupling
  • Fluid simulation method based on video reconstruction and eulerian model coupling

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Embodiment Construction

[0059] The present invention is described in detail below in conjunction with accompanying drawing:

[0060] The present invention comprises the following steps:

[0061] 1) Three-dimensional density field reconstruction

[0062] To extend a single direction video to two directions, first use the least squares matching method to obtain an approximate density field, then iteratively improve iteratively through the expectation maximization algorithm, and finally obtain a smooth and symmetrical density field.

[0063] 2) Euler's method to solve the N-S equation

[0064] For the inviscid N-S equation, the velocity field and density field of the next frame are obtained by solving the time-splitting method through advection, external force and projection, etc.

[0065] 3) Three-dimensional velocity field reconstruction

[0066] The reconstructed density field is used as prior information, and the result of Euler's method is used for correction to obtain a three-dimensional veloci...

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Abstract

The invention discloses a fluid simulation method based on video reconstruction and eulerian model coupling. The fluid simulation method comprises the steps of 1) reconstructing a three-dimensional density field of each frame of a fluid according to an input video; 2) solving an N-S equation by adopting an eulerian method, and updating the speed field and density field of the fluid; 3) taking the reconstructed density field of adjacent two frames as prior information and taking the result of the eulerian method as correction to reconstruct a three-dimensional speed field of the fluid; and 4) guiding the eulerian fluid simulation by using the reconstructed density field and speed field to generate a new animation effect. By adoption of the fluid simulation method, the density field and the speed field of the fluid can be reconstructed with relatively high precision; and by tightly coupling the reconstructed data and a fluid geometrical model, a fluid animation effect which is more closer to an actual condition can be obtained, and controllable fluid details can be added.

Description

technical field [0001] The invention belongs to the field of computer graphics, in particular to a fluid simulation method based on the close coupling of video reconstruction and Euler model, which includes video-based density field reconstruction, three-dimensional velocity field reconstruction and Euler fluid simulation methods. Background technique [0002] Fluid simulation has gained considerable attention in computer graphics in recent decades due to the ubiquity of fluids in natural scenes and the variety of interesting details such as eddies and splashes. Research on the subject has also found wide-ranging applications, including film special effects and computer games. Especially in recent years, the popularity of virtual reality technology has brought wider application prospects for fluid simulation, and at the same time, it has also brought higher requirements in terms of realism. [0003] Physics-based flow simulation mainly provides two types of methods: Lagrang...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T13/60G06T17/00
CPCG06F30/20G06T13/60G06T17/00
Inventor 王长波李凤豫
Owner EAST CHINA NORMAL UNIV
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