Description

This model uses

  • d2q7 cumulant collision kernel for hydrodynamics
  • d2q7 cumulant or cascaded collision kernel for heat
  • Boussinesq approx to couple heat with hydrodynamics

It is a 2d version od d3q27q27_cm_cht

BC

  • periodic
  • Dirichlet - Equilibrium scheme (1st order convergence)
  • Dirichlet - Anti Bounce Back (2nd order convergence)
  • Dirichlet - Interpolated Anti Bounce Back (2nd order convergence)
  • Neumann like bc - impose heat flux

  • WVelocity inlet

  • EPressure Outlet
  • Neumann Outlet
  • Convective Outlet

Details

Model description files files for this model: Dynamics.c Dynamics.R

Zonal Settings

Name Comment
VelocityX inlet/outlet/init x-velocity component
VelocityY inlet/outlet/init y-velocity component
Pressure inlet/outlet/init pressure
InitTemperature Initial/Inflow temperature distribution
InitHeatFlux Initial/Inflow heat flux through boundary
conductivity thermal conductivity of fluid (W/(m·K))
material_density density of material [kg/m3]
cp specific heat capacity at constant pressure of fluid (J/(kg·K))
Sigma_GH Initial width of the Gaussian Hill
FDragInObj Weight of [Force exerted on body in X-direction] in objective
FLiftInObj Weight of [Force exerted on body in Y-direction] in objective
XHydroFLuxInObj Weight of [Momentum flux in X-direction] in objective
YHydroFLuxInObj Weight of [Momentum flux in Y-direction] in objective
XHydroFLux2InObj Weight of [Momentum flux (2nd logger) in X-direction] in objective
YHydroFLux2InObj Weight of [Momentum flux (2nd logger) in Y-direction] in objective
HeatFluxXInObj Weight of [Heat flux in X-direction] in objective
HeatFluxYInObj Weight of [Heat flux in Y-direction] in objective
HeatFluxX2InObj Weight of [Heat flux (2nd logger) in X-direction] in objective
HeatFluxY2InObj Weight of [Heat flux (2nd logger) in Y-direction] in objective
HeatSourceInObj Weight of [Total Heat flux from body] in objective

Global Settings

Name Derived Comment
GravitationX applied rho*GravitationX
GravitationY applied rho*GravitationY
nu kinematic viscosity
GalileanCorrection Galilean correction term
nu_buffer kinematic viscosity in the buffer layer
conductivity_buffer thermal conductivity in the buffer layer
Omegafor3rdCumulants relaxation rate for 3rd order cumulants
h_stability_enhancement magic stability enhancement
BoussinesqCoeff BoussinesqCoeff=rho_0*thermal_exp_coeff
CylinderCenterX X coord of cylinder with imposed heat flux
CylinderCenterY Y coord of cylinder with imposed heat flux
CylinderCenterX_GH X coord of Gaussian Hill
CylinderCenterY_GH Y coord of Gaussian Hill
Threshold Parameters threshold

Exported Quantities (VTK, etc)

Name Unit Comment
Rho kg/m3 Rho
U m/s U
H J H
T K T
m00_F 1 m00_F
material_density kg/m3 material_density
cp J/kg/K cp
conductivity W/m/K conductivity
RawU m/s RawU

Exported Global Integrals (CSV, etc)

Name Unit Comment
FDrag N Force exerted on body in X-direction
FLift N Force exerted on body in Y-direction
XHydroFLux kg/s Momentum flux in X-direction
YHydroFLux kg/s Momentum flux in Y-direction
XHydroFLux2 kg/s Momentum flux (2nd logger) in X-direction
YHydroFLux2 kg/s Momentum flux (2nd logger) in Y-direction
HeatFluxX W Heat flux in X-direction
HeatFluxY W Heat flux in Y-direction
HeatFluxX2 W Heat flux (2nd logger) in X-direction
HeatFluxY2 W Heat flux (2nd logger) in Y-direction
HeatSource W Total Heat flux from body
Objective 1 Objective function

Node Types

Group Types
ADDITIONALS DarcySolid, Smoothing
ADDITIONALS_HEAT HeaterDirichletTemperatureEQ, HeaterDirichletTemperatureABB, HeaterSource, HeaterNeumannHeatFluxCylinder, HeaterNeumannHeatFluxEast
BOUNDARY Wall, Solid, WVelocity, WPressure, WPressureL, EPressure, EVelocity, ENeumann
COLLISION BGK, MRT, CM, CM_HIGHER, CM_HIGHER_NONLINEAR, Cumulants
DESIGNSPACE DesignSpace
NONE None
OBJECTIVEFLUX FluxMeasurmentZone1, FluxMeasurmentZone2
OBJECTIVEFORCE ForceMeasurmentZone
SETTINGZONE DefaultZone

Solved fields

Name Access pattern Comment
f000 stencil flow LB density F 0
f100 stencil flow LB density F 1
f200 stencil flow LB density F 2
f010 stencil flow LB density F 3
f110 stencil flow LB density F 4
f210 stencil flow LB density F 5
f020 stencil flow LB density F 6
f120 stencil flow LB density F 7
f220 stencil flow LB density F 8
h000 stencil heat LB density H 1
h100 stencil heat LB density H 2
h200 stencil heat LB density H 3
h010 stencil heat LB density H 4
h110 stencil heat LB density H 5
h210 stencil heat LB density H 6
h020 stencil heat LB density H 7
h120 stencil heat LB density H 8
h220 stencil heat LB density H 9
U stencil U

Densities - default accessors

Name Field Pulling field from Comment
f000 f000 stencil flow LB density F 0
f100 f100 stencil flow LB density F 1
f200 f200 stencil flow LB density F 2
f010 f010 stencil flow LB density F 3
f110 f110 stencil flow LB density F 4
f210 f210 stencil flow LB density F 5
f020 f020 stencil flow LB density F 6
f120 f120 stencil flow LB density F 7
f220 f220 stencil flow LB density F 8
h000 h000 stencil heat LB density H 1
h100 h100 stencil heat LB density H 2
h200 h200 stencil heat LB density H 3
h010 h010 stencil heat LB density H 4
h110 h110 stencil heat LB density H 5
h210 h210 stencil heat LB density H 6
h020 h020 stencil heat LB density H 7
h120 h120 stencil heat LB density H 8
h220 h220 stencil heat LB density H 9
U U stencil U

Action stages

Name Main procedure Preloaded densities Pushed fields
BaseIteration Run f000, f100, f200, f010, f110, f210, f020, f120, f220, h000, h100, h200, h010, h110, h210, h020, h120, h220, U f000, f100, f200, f010, f110, f210, f020, f120, f220, h000, h100, h200, h010, h110, h210, h020, h120, h220, U
BaseInit Init none f000, f100, f200, f010, f110, f210, f020, f120, f220, h000, h100, h200, h010, h110, h210, h020, h120, h220, U

Actions

Name Stages
Iteration BaseIteration
Init BaseInit