One of the most important parameters is “Cell size”, because it occurs in so many places: the Hybrido domain node, all objects, and even the “Splash” emitter has a “Cell size” parameter when its particle type is set to “Hybrido”. Here are answers to some of the most common questions about “Cell size".:
What is the “Cell size” parameter?
- HyFLIP Hybrido core fluid simulations work with grids and these grids are made of cells with a certain size.
- The value represents the smallest possible length of a cell's edges.
- With Cell size = 0.3, for example, the smallest cell will be 0.3 m x 0.3 m x 0.3 m = 0.027 m3.
How does “Cell size” affect a simulation?
- With smaller cell sizes you create Smaller cells mean more cells, and therefore the number of particles will be increased as well. This also results in longer simulation times.
- Smaller cells improve → fluid-object interaction.
Why do objects have a “Cell size” parameter?
- HyFLIP Hybrido simulations are based on cells and this affects objects as well.
Does an object's “Cell size” influence RealFlow's other simulation engines
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An object's "Cell size" is only used in conjunction with Hybrido and Dyverso simulations.
Does an object's “Cell size” influence
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Hybrido secondary fluids, e.g. splash or foam?
- Only indirectly, because the amount of core fluid particles is responsible for the creation of HySPH secondary elements.
- “Splash” and “Splash and Foam” particles can be simulated with the Hybrido solver. In this case, “Cell size” is relevant again.
- “Mist” is a volumetric node and always uses cells for storing the mist clouds, but here “Cell size” is adjusted independently from other nodes.
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I have decreased my object's “Cell size” to a very small value, but it's still leaking. Why?
- Please take a look at Under → “Hybrido Object Interaction” to you learn how to optimize your objects.
- If the object's “Cell size” value is smaller than the one from the domain then you will not see any improvement.
- Does the object contain very thin structures? The minimum thickness that can be recognized by Hybrido is equal to the domain's “Cell size” value.
- If the fluid is very fast it is also possible that particles will simply go through an object. You can make your object thicker, and/or increase the number of → substeps.
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- A higher number of cells results in longer simulation times.The effective simulation time depends on many other parameters, e.g. → “MIN | MAX substeps”, → “Particle sampling”, → “Creation mode”, and interacting objects.
- If the scene contains complex objects with small “Cell size” it takes longer to prepare and start the simulation.
- More cells allocate more memory and simulation files will be bigger.