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
BODY	Body
BOUNDARY	EPressure, Solid, Wall, WVelocity
COLLISION	CM, CM_HIGHER, CM_HIGHER_NONLINEAR, Cumulants
HO_BOUNDARY_HEAT	HeaterDirichletTemperatureIABB, ThermalIBB
HO_BOUNDARY_HYDRO	HydroIBB
OBJECTIVEFLUX	FluxMeasurmentZone1, FluxMeasurmentZone2
OBJECTIVEFORCE	ForceMeasurmentZone
SETTINGZONE	DefaultZone

Solved fields

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

Densities - default accessors

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