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2D fluid simulation

This is the final project I made for the Physics-based animation class during my school. The code is placed here.

I have implemented a 2D stable fluid method using OpenGl based on the NVIDIA article and this paper. 

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I'll omit the detailed explanation since there is a detailed theory explanation on the NVIDIA article. 

However, if I simply explained it, this program is to simulate Naiver-Stokes Equation in continuous small-time (I know this sounds dumb, but I don't really know how to explain this otherwise XD)

Screenshot_1.png

Advection

Pressure

Diffusion

External Forces

Screenshot_2.png

There are 4 terms in this equation, Advection, Pressure, Diffusion, and External Forces. For each iteration, I stored those states as textures, and update the final picture based on the textures every frame. Below the transition of textures in 1 frame (I skipped the diffusion part for my implementation since it looks more natural to me)

Screenshot_3.png

Add external force

Current frame

Screenshot_4.png

Velocity map

Calculate divergence based on velocity

Screenshot_5.png

Divergence map

Calculate pressure 

Screenshot_6.png

Pressuer map

Update velocity map based on pressure map

Screenshot_7.png

Updated velocity map

Screenshot_8.png

Next frame

This project was easier than I expected even though I knew nothing about physics and mathematics required for this simulation. I would like to challenge 3D fluid simulation using volumetric rendering next time :)

References:

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1. https://disney-animation.s3.amazonaws.com/library/s2012_pbs_disney_brdf_notes_v2.pdf

2. https://developer.nvidia.com/sites/all/modules/custom/gpugems/books/GPUGems/gpugems_ch38.html

3. https://note.com/unshift/n/nceb8d05620d9

4. http://el-ement.com/blog/2015/03/16/gpu-fluid/

5. http://blog.livedoor.jp/toropippi/archives/52986.html

6. https://hipwallpaper.com/super-sonico-backgrounds/

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