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Discretizing Three-dimensional Pulsating Wind Field for Falling Snow Simulation Based on D3Q7 Lattice

Author: LiHongTing
Tutor: LvMengYa
School: Yanshan University
Course: Computer Software and Theory
Keywords: Snow scene Physical model LBM Wind farm modeling D3Q7 lattice model 3D snowflake model
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 25
Quote: 0
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Abstract


The snow simulation natural landscape , you can greatly enhance the realistic effect of the virtual scene . Snowflakes form irregular movement no regularity as well as by environmental factors affect the characteristics of large , its modeling and motion description is very difficult . Realistic simulation of snow let real snow particles immersed to the wind farm . To this end , this paper focuses on the following areas for study and discussion. First, the analysis of the existing literature on the aerodynamics , to determine the nature of turbulent wind characteristics , improved modeling of the wind field with D3Q7 lattice model . LBM establish wind field model , simply the description of the random motion of the wind in the wind, the equations of motion of the particles in the introduction of one or several external force to simulate the randomness of the wind particle motion a greater difference between the trajectory of the wind . D3Q7 lattice model can better describe the random movement of particles in all directions , so a more realistic simulation of the movement of the wind stress analysis further immersed wind farm snow particles to simulate a more realistic fidelity floating snow scene . Secondly, the snow particles stress analysis , given its movement along the grid lines . Not necessarily correspond to completely snow particle 's position and three-dimensional grid point calculated using probability analysis method for processing , to ensure that the change of the average position of the snow particles flow with the expected speed , movement along the lattice lines . Both analog the snowflakes fluttering of randomness , but also ensure the snowflakes fluttering of particles in the macro is accurate . Again , using fractal method to draw lines , to construct a three-dimensional snowflakes . Snowflake model of the structure of conventional snow scenes are two-dimensional , not able to meet the simulation of the movement of snow in reality to rotate in the wind field , the method can guarantee the drawing speed of the snow scene snow simultaneously meet its own rotational movement simulation. Finally , a snow simulation system was designed and implemented , and experimental verification of the the snow simulation algorithm proposed .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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