Particle Scalar¶

Introduction¶

Particle scalars are assigned to individual particles. These properties convey with each particle as it moves through the system. Particle scalars represent a species concentration contained within individual particles. Particle scalars can participate in intra-particle reactions but are not transported to/from the particle via interfacial mass transfer. This behavior is different from particles interacting with the fluid field via scalar coupling. As such, the value of a particle scalar will only change in response to particle reactions.

Particle scalars do not interact (directly) with scalar fields and do not participate (directly) in interfacial mass transfer processes. They are instead primarily used to model intra-particle curing and intra-particle reaction processes which occur at user-defined reaction rates. In this way, particle scalars are often coupled with a background fluid configuration.

The concept of a particle scalar is closely related to the concept of a particle variable. The difference is in scope and generality. A particle scalar can only be changed over time due to intra-particle reactions. A particle variable is more general, as the value can change over time due to both intra-particle reactions and/or variable-specific UDFs. The focused scope of the particle scalar can be easier to set up and may be more efficient at runtime.

Particles scalars are added as children to a particle family. When adding a new particle scalar, users will be prompted to a select a particle family to which the particle scalar will be added. Multiple particle scalar values can be assigned to a given particle family.

Property Grid¶

`General`¶

Initial Scalar: Initial value associated with the particle scalar. This value will be assigned uniformly to all particles associated with the particle family.

`Display Name, Unit`¶

Display Name Override: Name override for output files. If left empty, the object name is used.
Display Unit Override: Name of units shown in output files.

Particle Scalar Toolbar¶

Context-Specific Toolbar Forms	Description
Help	The Help command launches the M-Star reference documentation in your web browser.

For a full description of each option, see Context-Specific Toolbar selections.