Units¶
The FSD plugin uses dimensionless units so that all quantities are approximately . No conversion factors need to be applied to the result to get results with the expected normalization. The fundamental units are: the particle radius
, the solvent viscosity
, and Boltzmann’s constant
.
- The fundamental units in the plugin are:
- Distance -
- Translation-Force Hydrodynamic Resistance -
- Traslation-Torque/Rotation-Force Hydrodynamic Resistance -
- Rotation-Torque/Stresslet-Strain Hydrodynamic Resistance -
- Temperature -
, i.e. setting
in the plugin units corresponds to
- Distance -
- With these normalizations, the dimensionless resistance tensors for isolated particles in an unbounded domain would be:
Note that these exact values won’t be obtained computing the resistance for an isolated particle using the FSD plugin because the simulation is performed in periodic geometries. In particular, would need to be corrected for the periodic backflow described by Hasimoto (J. Fluid Mech., 1959).