Node444 - CFD SUPPORT

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Physical setup and data for meshing

The directory constant contains a physical setup of flow and a definition of mesh geometry.
Table shows the constant hierarchy.
trisurface – directory containing input geometry for snappyHexMesh utility.
g – file containing definition of gravity acceleration .
kinematicCloudProperties – this file defines:
- solution – particle solution settings
  - active – true for particle adding
  - coupled – true for the influence of parcels to the continuous phase
  - transient – true for transient simulation
  - cellValueSourceCorrection – correction of cell values within the Lagrangian time step
  - maxCo – maximum particle Courant number
  - interpolationSchemes – interpolation schemes for continuous fields
  - averagingMethod – dual for dual-mesh Lagrangian averaging procedure – averaging over the cells and dual (tetrahedral) volumes
  - integrationSchemes – definition of integration schemes of velocity field U
  - sourceTerms – scheme for source therm in momentum equation of continuous phase, relevant if coupled is activated
- constantProperties – density and max fraction of particles
- subModels – particular particle properties definition
  - particleForces – particle drag modelling
    - ErgunWenYuDrag – drag model which is suitable for all particulate volume fractions up to the closed packed condition
    - gravity – acceleration due to the gravity
  - injectionModels – method of particle injection (model1 – user name of model defined below)
    - type – patchInjection for injection at the patch
    - massTotal – total mass to inject
    - SOI – start time of injection
    - parcelBasisType – parcel basis enumeration
    - patchName – name of the patch for particle injection
    - duration – overall time of injection
    - parcelsPerSecond – number of particle per second
    - U0 – entering velocity of particles
    - flowRateProfile – distribution of injected particle with respect to the duration, constant 1 means uniform
    - sizeDistribution – size of particles constant (fixedValue), or e.g. normal distribution (normal)
    - type – type of size distribution
    - normalDistribution – definition of normal distribution function by setting expectation, variance, minValue and maxValue
  - dispersionModel – no dispersion model is implemented yet
  - patchInteractionModel – localInteraction for patch-by-patch interaction specification
  - localInteractionCoeffs – patch interaction definition
    - type – rebound for simple rebound, e – elasticity coefficient ( “percentage” dissipation in normal direction) , mu – restitution coefficient (dissipation in tangential direction)
    - type – escape for outlet patches
  - heatTransferModel – none for no heat transfer modelling
  - surfaceFilmModel – none for no surfaceFilmModel
  - packingModel – implicit model for applying an inter-particle stress to the particles
  - implicitCoeffs – implicit model setting
    - alphaMin – minimum stable volume fraction
    - rhoMin – minimum stable density
    - applyGravity – a gravity force can optionally be applied to the particles as part of this model
    - type HarrisCrighton – inter-particle stress model of Harris and Crighton as a particleStressModel
    - alphaPacked – close pack volume fraction
    - pSolid – solid pressure coefficient
    - beta – exponent of the volume fraction
    - eps – smallest allowable difference from the packed volume fraction
  - dampingModel – no model for collision damping time of particle velocity fluctuation
  - isotropyModel – stochastic return-to-isotropy model – adding collision term that causes velocity distributions to relax to isotropic Gaussian distributions
  - stochasticCoeffs
    - type – isotropic model for the time scale over which the velocity field of a dispersed phase tends towards an isotropic distribution
    - alphaPacked – close pack volume fraction
    - e – coefficient of restitution
  - stochasticCollisionModel – no stochastic collision model implemented
  - radiation – no radiation model
transportProperties – defines kinematic viscosity of Newtonian fluid.
turbulenceProperties.water – defines type of turbulence modelling.

Table: Physical properties and geometry data

$\displaystyle{^\llcorner}$ constant
$\displaystyle{^\llcorner}$ trisurface
$\displaystyle{^\llcorner}$ Cyclone-inlet.stl	<#37346#>
$\displaystyle{^\llcorner}$ Cyclone-outlet.stl
$\displaystyle{^\llcorner}$ Cyclone-wall.stl
$\displaystyle{^\llcorner}$ g	- gravity acceleration
$\displaystyle{^\llcorner}$ kinematicCloudProperties	- particle settings
$\displaystyle{^\llcorner}$ transportProperties	- transport properties
$\displaystyle{^\llcorner}$ turbulenceProperties.water	- turbulence setup