Backward Compatibility with Version 5.2

Turbulent Dispersion Changes

In the settings window for the Drag Force for the Particle Tracing for Fluid Flow interface, the Turbulent dispersion check box has been replaced by the Turbulent dispersion model list. If the check box is selected in a model created in version 5.2 or earlier, then after opening the model in version 5.2a, the option Discrete random walk will be selected from the list. If the check box is cleared, then None will be selected from the list.

Particle Density Specifications Merged

In version 5.2, when specifying particle properties using the Particle Properties node or Override Properties node in the Particle Tracing for Fluid Flow interface, it is possible to specify two different values of the particle density, depending on whether the Compute particle mass check box is selected. In version 5.2a, these two values have been merged into a single parameter value; that is, the value or expression for the Particle density will be retained when selecting or clearing the Compute particle mass check box in the physics interface Advanced Settings section.

Particle Beam Changes

The names of several settings have been changed in the Particle Beam feature for the Charged Particle Tracing interface.

In the Sampling from phase space distribution list, Uniform has been renamed KV.

In the Longitudinal velocity distribution list, Uniform has been renamed None and Gaussian has been renamed Normal.

The parameters Position refinement factor and Release distribution accuracy order have been removed. Due to some changes in the algorithm for initializing particle positions, in version 5.2a, the distribution of particle positions no longer depends on the finite element mesh and may differ from the distribution in version 5.2.