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Self advection, external force and pressure solve to a velocity field represented by a MaC grid.

Home Page: http://kbladin.se/dmt_projects/fluid_simulation.php

License: MIT License

CMake 7.72% C++ 90.24% C 1.06% GLSL 0.98%
fluid-simulation fluid-dynamics fluid-solver fluid-simulation-engine fluid-grid advection grid volume-preservation navier-stokes equation

fluid_simulation's Introduction

Fluid_Simulation

Implemented

  • Staggered MAC Grid
  • Different advection schemes
    • Semi Lagrangian advection with
      • Bilinear interpolation
      • Runge Kutta and Euler solver
    • PIC advection with bilinear interpolation
    • FLIP advection with bilinear interpolation
    • PIC / FLIP combination
  • Pressure solve using the conjugate gradient method with the linear algebra library "Eigen"
  • Enforce Dirichlet boundary condition
  • Marker particles for air/fluid separation
  • Velocity extension using brute force search through grid

Examples:

Youtube video of real time simulation:

Real time fluid simulation

Not Yet Implemented

  • Adaptive time steps
  • Vorticity confinement
  • Make sure marker particles are outside of obstacles
  • Other interpolation alternatives (quadratic, cubic, Catmull Rom)
  • Other air/fluid separation techniques (for example level set)
  • 3D simulation

fluid_simulation's People

Contributors

kbladin avatar

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Forkers

jeunathe jsvanderdrift sevostianovivansis tommy12161995 damian-666 jonathanpham stomatogod jklae nicoduce zengweitick chkob stjordanis syam-s

fluid_simulation's Issues

Wondering if the A Matrix is missing a (times) dt factor

Hey!
I'm implementing something similar following Bridson's textbook as well! Sometimes I look at this codebase as a reference ;)
Wondering however whether or not this is a mistake on my end or not. It seems the A Matrix as constructed in your pressureSolve() function has coefficients that are not multiplied by the timestep length, as the textbook suggests they should be.

Maybe you just assume a timestep of 1 and that works out for you?
Thanks

any instructions about how to build and run this project?

find some errors when use cmake to build
And after fix them, there is an Assertion after ./fluidsim_simple

frame 0
Assertion failed: (index >= 0 && index < size()), function operator[], file /usr/local/Cellar/eigen/3.3.7/include/eigen3/Eigen/src/Core/DenseCoeffsBase.h, line 162.
Abort trap: 6

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