Use the Number Density Calculation feature to compute the spatial number density of particles in the selected domains. The number density is computed by counting the particles in each mesh element in the selected domains, then dividing by the mesh element volume. In 2D the number of particles is divided by the mesh element area, whereas in 2D axisymmetric models it is divided by the element volume of revolution. The number density calculation can include all particles or may be restricted to particles corresponding to a specific release feature or a
Particle Properties node. Optionally the average velocity of particles in each element can also be computed.
When the Particle release specification is set to
Specify release times, you may enter a value or expression for the
Number multiplication factor nn (dimensionless). The default is 1. This acts as a scaling factor when counting the particles in each mesh element; if the value is changed to 10, for example, the number density of particles will be the number of particles in each mesh element, divided by the mesh element volume and multiplied by 10. If the
Enable macroparticles checkbox is selected in the physics interface
Additional Variables section, the text field for n is not shown; instead, the weighting factor is initialized by the particle release features.
Select an option from the Particle selection list to specify whether the
Number Density Calculation collects information based on
Release feature (the default) or
Particle properties.
If Release feature is selected, select an option from the
Release feature list. If
All (the default) is selected, the
Number Density Calculation collects information about all particles in the selected domains or boundaries, regardless of how they were released. Alternatively, select a particle release feature from the list, and then only the particles produced by that feature are included.
If Particle properties is selected from the
Particle selection list, select an option from the
Released particle properties list. If
All (the default) is selected, the
Number Density Calculation collects information about all particles in the selected domains or boundaries, regardless of their particle properties. Alternatively, select a particle properties feature from the list, and then only the particles associated with the selected
Particle Properties node are included.
Select the Compute average velocity checkbox to compute the average velocity of particles in each mesh element.
