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Like any other of Hybrido's components, the HyViscosity solver provides a couple of settings to control its accuracy and prevent instabilities. In order to make these settings, you have the ability to make global or local settings. Global settings are always made under RealFlow's “Preferences” panel and the values you enter there are valid for every scene – just like defaults. If you want to define values for the currently loaded scene you can do this with the “Simulation Options” panel:
[ Image: “Simulate” button → triangle → Options ]
All changes made here will be stored with the scene, so you do not have to repeat everything once you reopen the project. But, when you create a new project the default values from the “Preferences” section will be used again.
Under Hybrido > Viscosity Solver you can see two entries:
MAX iterations
In most cases, the default setting is sufficient, but under some circumstances it can be necessary to increase this value, for example when you see a warning message. Normally you will not see any misbehaving particles and you can proceed with the simulation. We recommend creating an OpenGL preview to see if the fluid behaves correctly.
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In the left part of the “Simulation Flow” window you can see a tree structure with several graphs. Simply click on a graph's name, e.g. “Create viscosity channel” and its layout will appear in an editor. Of course, the graphs are fully annotated and explained.
Viscosity Values
Here is a table with viscosity values for different substances. Viscosity's associated SI unit is Pascal Second [Pa s] and represented through the Greek letter η (“Eta”). Some resources use other units, so please make sure that you always look for values with Pascal Second.
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[ Table ]