Changes between Version 40 and Version 41 of doc/app/particle_parameters


Ignore:
Timestamp:
Sep 13, 2010 1:04:05 PM (14 years ago)
Author:
suehring
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • doc/app/particle_parameters

    v40 v41  
    9797}}}
    9898{{{#!td
    99 Ratio of the density of the fluid and the density of the particles.
     99Ratio of the density of the fluid and the density of the particles. \\
     100With the default value the particles are weightless and transported passively with the resolved scale flow. In case of '''density_ratio''' ''/= 0.0'' particles have a mass and hence inertia so that their velocity deviates more or less from the velocity of the surrounding flow. Particle velocity is calculated analytically and depends on (besides the density ratio and the current velocity difference between particles and surrounding fluid) the particle radius which is determined via [#radius radius] as well as on the molecular viscosity (assumed as 1.461E-5 m{{{^2}}}/s).
    100101
    101 With the default value the particles are weightless and transported passively with the resolved scale flow. In case of density_ratio /= 0.0 particles have a mass and hence inertia so that their velocity deviates more or less from the velocity of the surrounding flow. Particle velocity is calculated analytically and depends on (besides the density ratio and the current velocity difference between particles and surrounding fluid) the particle radius which is determined via radius as well as on the molecular viscosity (assumed as 1.461E-5 m2/s).
     102If '''density_ratio''' ''= 1.0'', the particle density corresponds to the density of the surrounding fluid and the particles do not feel any buoyancy. Otherwise, particles will be accelerated upwards ('''density_ratio''' > ''1.0'') or downwards ('''density_ratio''' < ''1.0'').
    102103
    103 If density_ratio = 1.0, the particle density corresponds to the density of the surrounding fluid and the particles do not feel any buoyancy. Otherwise, particles will be accelerated upwards (density_ratio > 1.0) or downwards (density_ratio < 1.0).
    104 
    105 With several groups of particles (see number_of_particle_groups), each group can be assigned a different value. If the number of values given for density_ratio is less than the number of groups defined by number_of_particle_groups, then the last assigned value is used for all remaining groups. This means that by default the particle density ratio for all groups will be 0.0.
     104With several groups of particles (see [#number_of_particle_groups number_of_particle_groups]), each group can be assigned a different value. If the number of values given for '''density_ratio''' is less than the number of groups defined by [#number_of_particle_groups number_of_particle_groups]), then the last assigned value is used for all remaining groups. This means that by default the particle density ratio for all groups will be ''0.0''.
    106105}}}
    107106Table row with nesting:\\