Fluid Simulation Project for PBS

Simulation of mixing fluids for Physically-based Simulation at ETH Zurich

Group members

Name	E-Mail	Legi No.
Viviane Yang	vyang@ethz.ch	16-944-530
Daniel Sparber	dsparber@ethz.ch	17-948-191
Jela Kovacevic	jelak@ethz.ch	15-923-428

Install & Run

# Build
mkdir build
cd build
cmake ..
make -j8

# Run
cd cocktails
./coktails

Code Structure

We used the dummy project from the lecture as a template.

Headers: cocktails/include
Source: cocktails/src
Main class: main.cpp

The main class handles the initialization of the simulation and starts a simple GUI that visualizes the simulation and can be used to tweak various parameters.

Simulations

You can choose between two different types of simulation:

SphSimulation - the vanilla SPH simulation
DCSPHSimulation - the density contrast SPH simulation

Fluids

A fluid is described by a Fluid instance and defines SPH parameters. Each fluid instance contains a collection of Particles.

Sources

A Source generates particles. Sources that create particles at initialization are:

BlockSource - generates a block of particles
CustomSource - generates particles based on a .xyz file
StateSource - generates particles from a saved state (i.e. restores particles)

Additionally, there are two sources that continuously generate particles

GeneratingSource - Continuously releases new particles
EmittingSource - Emits blocks of particles at some interval

Features

Basic SPH Simulation

Main reference: Particle-Based Fluid Simulation for Interactive Applications

Density Contrast SPH

For better interaction of fluids with different densities. Main reference: Density Contrast SPH Interfaces

Boundary Handling

Boundaries are modeled as particles. This allows us to use arbitrary shapes. Given a Mesh, we use Possion-Disk-Sampling to generate particles.

For better boundary handling, we implemented a radial repulsion. Our main reference: SPH particle boundary forces for arbitrary boundaries

Surface tension