“Dumb” particles can be simulated very fast, because they do not obey the rules of fluid dynamics. This means there are no forces acting between the particles and particle-particle or particle-object collisions are performed on a very low level. In combination with Hybrido, the dumb splash particles simply inherit velocity and direction of the “emitting” grid fluid particles. External forces, for example from daemons, will then decelerate the particles and direct them in a different direction. The possibilities of adjusting these particles are therefore limited.
Type
If you do not want to use the “Dumb” type you can also switch to “Liquid”. Simulations with liquid particles take much longer, but they also create very realistic results, especially for mid-scale simulations.
Density
A fluid's “Density” value does not influence the simulation and you can use any value. This changes when there is more than one particle fluid source and you want to achieve a certain effect, for example fluids that cannot mix, like water and alcohol. The parameter's unit is kg per cubic metre [ kg/m3 ].
Viscosity
Each fluid has a certain amount of viscosity, even water. It defines the tendency of particles to stick together. With very high values you can observe the typical strings in viscous fluids when they are torn apart. Substances with very high viscosity are honey, tar or syrup, for example. Fluids with low viscosity are alcohol, many solvents or liquid gases. Exaggerated settings can lead to misbehaving particles with high velocities.
Surface tension
On a fluid’s surface we can observe forces that keep the outmost molecules together, creating a kind of skin. Some insects, such as water striders, can even walk on this tight skin. Surface tension can also prevent water from infiltrating cloth to dissolve the dirt. For that reason, detergents contain special substances to reduce the fluid’s surface tension”. These are called surfactants or tensides. A water drop’s shape is mostly a result of these forces.
Max particles
This parameter is a very convenient method to control the number of particles, although it is rarely used. When the total number of emitted particles exceeds this value, the emitter will not be able to create more particles and emission stops.