### 16.2.5. Variables Relevant for Particle Tracking

The following table contains a list of variables (with both long and short variable names) that can be used when working with particle tracking.

Note: Variables with names shown in bold text are not output to CFD-Post. However, some of these variables can be output to CFD-Post by selecting them from the Extra Output Variables List on the Results tab of the Solver > Output Control details view of CFX-Pre.

Long Variable Name | Short Variable Name | Units | User Level | Definition
--- | --- | --- | --- | ---
Latent Heat | lheat | [ ] | 2 C, R, M | User-specified latent heat for phase pairs involving a particle phase.
Particle Momentum Source | ptmomsrc | [ ] | 2 A, C, M, P, R | Momentum source from particle phase to continuous phase.
Particle Diameter | particle diameter | [ ] | 3 A, C, M, R | Diameter of a particle phase.

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