Changes between Version 64 and Version 65 of doc/app/particle_parameters


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Timestamp:
Sep 13, 2010 2:01:25 PM (14 years ago)
Author:
suehring
Comment:

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  • doc/app/particle_parameters

    v64 v65  
    9999{{{#!td
    100100Ratio of the density of the fluid and the density of the particles. \\
    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 radius] as well as on the molecular viscosity (assumed as 1.461E-5 m*{{{2}}}/s).
     101With 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 m2/s).
    102102
    103103If '''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'').
     
    144144|| v*2 ||  variance of the v particle velocity component with respect to v (in m2/s2) ||
    145145|| w*2 ||  variance of the w particle velocity component with respect to w (in m2/s2) ||
    146 || u''2 ||  variance of the subgrid-scale u particle velocity component with respect to u" (in m2/s2) ||
    147 || v''2 ||  variance of the subgrid-scale v particle velocity component with respect to v" (in m2/s2) ||
     146|| u"2 ||  variance of the subgrid-scale u particle velocity component with respect to u" (in m2/s2) ||
     147|| v"2 ||  variance of the subgrid-scale v particle velocity component with respect to v" (in m2/s2) ||
    148148|| w"2 ||  variance of the subgrid-scale w particle velocity component with respect to w" (in m2/s2)  ||
    149149|| npt*2 ||  variance of the number of particles with respect to the average number of particles per subdomain  ||