D2q9 bc

Description

The d2q9 model is a basic 2D Lattice Boltzmann Method model for flow simulation.

It is a implementation of a simple Multiple-Relaxation-Time collision operator.

The model has one option: BC. This option turns on custom fields for setting non-standard profiles on inlets and other things.

Details

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

Zonal Settings

Name	Comment
VelocityX	inlet/outlet/init velocity
VelocityY	inlet/outlet/init velocity
Pressure	inlet/outlet/init density
PressureLossInObj	Weight of [pressure loss] in objective
OutletFluxInObj	Weight of [pressure loss] in objective
InletFluxInObj	Weight of [pressure loss] in objective

Global Settings

Name	Derived	Comment
RelaxationRate	1.0/(3*Viscosity + 0.5)	one over relaxation time
Viscosity		viscosity
GravitationX		GravitationX
GravitationY		GravitationY
S2	1-RelaxationRate	MRT Sx
S3		MRT Sx
S4		MRT Sx
Threshold		Parameters threshold

Exported Quantities (VTK, etc)

Name	Unit	Comment
Rho	kg/m3	Rho
U	m/s	U

Exported Global Integrals (CSV, etc)

Name	Unit	Comment
PressureLoss	1mPa	pressure loss
OutletFlux	1m2/s	pressure loss
InletFlux	1m2/s	pressure loss
Objective	1	Objective function

Node Types

Group	Types
BOUNDARY	EPressure, WPressure, NVelocity, SVelocity, WVelocity, EVelocity, NSymmetry, SSymmetry, Solid, Wall
COLLISION	MRT
OBJECTIVE	Inlet, Outlet
SETTINGZONE	DefaultZone

Solved fields

Name	Access pattern	Comment
f[0]		f[0]
f[1]		f[1]
f[2]		f[2]
f[3]		f[3]
f[4]		f[4]
f[5]		f[5]
f[6]		f[6]
f[7]		f[7]
f[8]		f[8]
BC[0]		BC[0]
BC[1]		BC[1]

Densities - default accessors

Name	Field	Pulling field from	Comment
f[0]	f[0]		f[0]
f[1]	f[1]		f[1]
f[2]	f[2]		f[2]
f[3]	f[3]		f[3]
f[4]	f[4]		f[4]
f[5]	f[5]		f[5]
f[6]	f[6]		f[6]
f[7]	f[7]		f[7]
f[8]	f[8]		f[8]
BC[0]	BC[0]		BC[0]
BC[1]	BC[1]		BC[1]

Action stages

Name	Main procedure	Preloaded densities	Pushed fields
BaseIteration	Run	f[0], f[1], f[2], f[3], f[4], f[5], f[6], f[7], f[8], BC[0], BC[1]	f[0], f[1], f[2], f[3], f[4], f[5], f[6], f[7], f[8], BC[0], BC[1]
BaseInit	Init	none	f[0], f[1], f[2], f[3], f[4], f[5], f[6], f[7], f[8], BC[0], BC[1]

Actions

Name	Stages
Iteration	BaseIteration
Init	BaseInit