Considering Effect of Brownian Motion in Ansys Fluent

How to consider the effect of Brownian Motion in Ansys Fluent?

For sub-micron particles in laminar flow, you may want to include the effects of Brownian motion on the particle trajectories. To do so, enable the Brownian Motion option under the Physical Models tab. To include Brownian motion effects, you must also select the Stokes-Cunningham drag law in the Drag Law drop-down list under Drag Parameters and specify the Cunningham Correction.

Please refer to the attached document below for more information.