Here you will find parameters to configure the fluid's physical properties. Please note that RealFlow's HyFLIP technology currently does not support highly viscous materials. Viscosity is internally calculated and optimized for watery substances.
Viscosity
Here you can enter the desired value to create different substances. The You can find detailed information about this feature here; the table under "HyFLIP - ViscosityViscosity Values" provides several viscosity values for various fluids.
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You can read more about the influence of time steps and the interaction between objects and fluids here.
Sampling control
Each grid cell is filled with a certain amount of particles. These particles have several functions and are not only there to visualize the fluid's body. They are, for example, also required to extract the fluid's surface and carry the fluid's velocity information. When “Sampling control” is set to “No”, RealFlow will automatically determine the number of particles per cell. With “Yes” you can unlock the following two parameters to define how many particles RealFlow should create.
@ min sampling
When “Sampling control” is set to “Yes” you have access to this parameter. If the number of particles in a cell is smaller than this value, RealFlow will add more particles until “@ min sampling” is reached. This value accepts integers and is dimensionless.
@ max sampling
Like the previous parameter, this value can only be changed with “Sampling control” set to “Yes”. If a cell’s number of particles is higher than the given value then RealFlow will remove the surplus particles to reach “@ max sampling”. This value accepts integers and is dimensionless.
Vorticity boost
To get a more turbulent fluid, it is possible to increase the particles' spin with this factor. Please try to avoid very high values (unless necessary), because they can completely distort the fluid. "Vorticity boost" is an implementation of the better-known "Vorticity Confinement" technique which can often be found in smoke simulation tools. This value accepts floats and is dimensionless. In many cases, values between 0.0 and 2.0 produce satisfying results. Please bear in mind that "Vorticity boost" is very sensitive.
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