# forced to sticking of soot particle

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#1
Senior Member

Govindaraju
Join Date: Apr 2010
Posts: 209
Rep Power: 16 Dear friends

I am trying to simulate a mixture of gas and soot particles .
My idea is to trap the soot particle by suitable design of the chamber.
Please find the CCL and attached geometry . I could not find any particle movement and no sticking effect in cfx post .
Kindly rectify my mistake

Your kind help is highly appreciated

Thank you

kmgraju

LIBRARY:

MATERIAL: Air Ideal Gas

Material Description = Air Ideal Gas (constant Cp)

Material Group = Air Data, Calorically Perfect Ideal Gases

Option = Pure Substance

Thermodynamic State = Gas

PROPERTIES:

Option = General Material

EQUATION OF STATE:

Molar Mass = 28.96 [kg kmol^-1]

Option = Ideal Gas

END

SPECIFIC HEAT CAPACITY:

Option = Value

Specific Heat Capacity = 1.0044E+03 [J kg^-1 K^-1]

Specific Heat Type = Constant Pressure

END

REFERENCE STATE:

Option = Specified Point

Reference Pressure = 1 [atm]

Reference Specific Enthalpy = 0. [J/kg]

Reference Specific Entropy = 0. [J/kg/K]

Reference Temperature = 25 [C]

END

DYNAMIC VISCOSITY:

Dynamic Viscosity = 1.831E-05 [kg m^-1 s^-1]

Option = Value

END

THERMAL CONDUCTIVITY:

Option = Value

Thermal Conductivity = 2.61E-2 [W m^-1 K^-1]

END

ABSORPTION COEFFICIENT:

Absorption Coefficient = 0.01 [m^-1]

Option = Value

END

SCATTERING COEFFICIENT:

Option = Value

Scattering Coefficient = 0.0 [m^-1]

END

REFRACTIVE INDEX:

Option = Value

Refractive Index = 1.0 [m m^-1]

END

END

END

MATERIAL: Soot

Material Group = Soot

Option = Pure Substance

Thermodynamic State = Solid

PROPERTIES:

Option = General Material

EQUATION OF STATE:

Density = 2000 [kg m^-3]

Molar Mass = 12 [kg kmol^-1]

Option = Value

END

REFERENCE STATE:

Option = Automatic

END

ABSORPTION COEFFICIENT:

Absorption Coefficient = 0 [m^-1]

Option = Value

END

END

END

END

FLOW: Flow Analysis 1

SOLUTION UNITS:

Length Units = [m]

Mass Units = [kg]

Solid Angle Units = [sr]

Temperature Units = [K]

Time Units = [s]

END

ANALYSIS TYPE:

EXTERNAL SOLVER COUPLING:

Option = None

END

END

DOMAIN: Default Domain

Coord Frame = Coord 0

Domain Type = Fluid

Location = B40

BOUNDARY: Boundary 1

Boundary Type = INLET

Location = F54.40

BOUNDARY CONDITIONS:

FLOW REGIME:

Option = Subsonic

END

MASS AND MOMENTUM:

Normal Speed = 10 [m s^-1]

Option = Normal Speed

END

TURBULENCE:

Option = Medium Intensity and Eddy Viscosity Ratio

END

END

FLUID: soot

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Normal Speed = 10 [m s^-1]

Option = Normal Speed

END

PARTICLE MASS FLOW RATE:

Mass Flow Rate = 0.8 [kg s^-1]

END

PARTICLE POSITION:

Option = Uniform Injection

NUMBER OF POSITIONS:

Number = 2000

Option = Direct Specification

END

END

END

END

END

BOUNDARY: out

Boundary Type = OUTLET

Location = F48.40

BOUNDARY CONDITIONS:

FLOW REGIME:

Option = Subsonic

END

MASS AND MOMENTUM:

Option = Average Static Pressure

Pressure Profile Blend = 0.05

Relative Pressure = 0 [Pa]

END

PRESSURE AVERAGING:

Option = Average Over Whole Outlet

END

END

END

BOUNDARY: wall

Boundary Type = WALL

Location = \

F41.40,F42.40,F43.40,F44.40,F45.40,F46.40,F47.40,F 49.40,F50.40,F51.40\

,F52.40,F53.40

BOUNDARY CONDITIONS:

MASS AND MOMENTUM:

Option = No Slip Wall

END

WALL ROUGHNESS:

Option = Rough Wall

Sand Grain Roughness Height = 0.2 [mm]

END

END

FLUID: soot

BOUNDARY CONDITIONS:

PARTICLE WALL INTERACTION:

Option = Equation Dependent

END

VELOCITY:

Option = Restitution Coefficient

Parallel Coefficient of Restitution = 1.0

Perpendicular Coefficient of Restitution = 0.3131

END

END

END

END

DOMAIN MODELS:

BUOYANCY MODEL:

Option = Non Buoyant

END

DOMAIN MOTION:

Option = Stationary

END

MESH DEFORMATION:

Option = None

END

REFERENCE PRESSURE:

Reference Pressure = 1 [atm]

END

END

FLUID DEFINITION: Air

Material = Air Ideal Gas

Option = Material Library

MORPHOLOGY:

Option = Continuous Fluid

END

END

FLUID DEFINITION: soot

Material = Soot

Option = Material Library

MORPHOLOGY:

Option = Dispersed Particle Transport Solid

PARTICLE DIAMETER CHANGE:

Option = Mass Equivalent

END

PARTICLE DIAMETER DISTRIBUTION:

Diameter = 1e-10 [m]

Option = Specified Diameter

END

PARTICLE SHAPE FACTORS:

Cross Sectional Area Factor = 1.0

END

END

END

FLUID MODELS:

COMBUSTION MODEL:

Option = None

END

FLUID: soot

EROSION MODEL:

Option = None

END

PARTICLE ROUGH WALL MODEL:

Option = None

END

END

HEAT TRANSFER MODEL:

Fluid Temperature = 300 [C]

Option = Isothermal

END

Option = None

END

TURBULENCE MODEL:

Option = k epsilon

END

TURBULENT WALL FUNCTIONS:

Option = Scalable

END

END

FLUID PAIR: Air | soot

Particle Coupling = One-way Coupling

MOMENTUM TRANSFER:

DRAG FORCE:

Option = Schiller Naumann

END

Option = None

END

TURBULENT DISPERSION FORCE:

Option = None

END

VIRTUAL MASS FORCE:

Option = None

END

END

END

END

INITIALISATION:

Option = Automatic

INITIAL CONDITIONS:

Velocity Type = Cartesian

CARTESIAN VELOCITY COMPONENTS:

Option = Automatic

END

STATIC PRESSURE:

Option = Automatic

END

TURBULENCE INITIAL CONDITIONS:

Option = Medium Intensity and Eddy Viscosity Ratio

END

END

END

OUTPUT CONTROL:

RESULTS:

File Compression Level = Default

Option = Standard

END

END

SOLVER CONTROL:

Turbulence Numerics = First Order

Option = High Resolution

END

CONVERGENCE CONTROL:

Length Scale Option = Conservative

Maximum Number of Iterations = 100

Minimum Number of Iterations = 1

Timescale Control = Auto Timescale

Timescale Factor = 1.0

END

CONVERGENCE CRITERIA:

Residual Target = 1.E-4

Residual Type = RMS

END

DYNAMIC MODEL CONTROL:

Global Dynamic Model Control = On

END

PARTICLE CONTROL:

PARTICLE INTEGRATION:

Option = Forward Euler

END

END

END

END

COMMAND FILE:

Version = 14.0

Results Version = 14.0

END

SIMULATION CONTROL:

EXECUTION CONTROL:

EXECUTABLE SELECTION:

Double Precision = Off

END

INTERPOLATOR STEP CONTROL:

Runtime Priority = Standard

MEMORY CONTROL:

Memory Allocation Factor = 1.0

END

END

PARALLEL HOST LIBRARY:

HOST DEFINITION: mechfran

Host Architecture String = winnt-amd64

Installation Root = C:\Program Files\ANSYS Inc\v%v\CFX

END

END

PARTITIONER STEP CONTROL:

Multidomain Option = Independent Partitioning

Runtime Priority = Standard

EXECUTABLE SELECTION:

Use Large Problem Partitioner = Off

END

MEMORY CONTROL:

Memory Allocation Factor = 1.0

END

PARTITIONING TYPE:

MeTiS Type = k-way

Option = MeTiS

Partition Size Rule = Automatic

END

END

RUN DEFINITION:

Run Mode = Full

Solver Input File = Fluid Flow CFX_001.res

END

SOLVER STEP CONTROL:

Runtime Priority = Standard

MEMORY CONTROL:

Memory Allocation Factor = 1.0

END

PARALLEL ENVIRONMENT:

Number of Processes = 1

Start Method = Serial

END

END

END

END
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