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-   -   particle tracking (http://www.cfd-online.com/Forums/cfx/22444-particle-tracking.html)

mike April 12, 2006 16:53

particle tracking
 
Hi,

I am trying to do particle tracking, and the .trk file is 0 kb.( no particle information is written). Do you have any idea why that might be happening?

Thanks, Mike

James April 13, 2006 10:50

Re: particle tracking
 
Hi,

How did you input particles(step or pulse) and how the particles was monitored(point or average)?

It would be easier to make comments if you provide more details about your modelling.

Regards!

James

mike April 13, 2006 12:41

Re: particle tracking
 
Hi James,

Thanks for your help. Is it important to monitor the particles? Can`t I just write the data to the .res file or .trk file without monitoring?

Below I added most of the .out file. I hope you can tell me my mistake.

Thanks again James,

Mike

LIBRARY:

MATERIAL: Tracer

Material Group = User

Option = Pure Substance

Thermodynamic State = Liquid

PROPERTIES:

Option = General Material

DYNAMIC VISCOSITY:

Dynamic Viscosity = 0.00089 [kg m^-1 s^-1]

Option = Value

END

EQUATION OF STATE:

Density = 997 [kg m^-3]

Molar Mass = 1.0 [kg kmol^-1]

Option = Value xxxxxxxxxxxxxx "I erased the water (bulk fluid) properties."

EXECUTION CONTROL:

PARALLEL HOST LIBRARY:

HOST DEFINITION: iherecfxmodeld

Remote Host Name = IHE-RECFXMODELD

Host Architecture String = intel_xeon64.sse2_winnt5.1

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

END

END

PARTITIONER STEP CONTROL:

Multidomain Option = Independent Partitioning

Runtime Priority = Standard

MEMORY CONTROL:

Memory Allocation Factor = 1.2

END

PARTITIONING TYPE:

MeTiS Type = k-way

Option = MeTiS

Partition Size Rule = Automatic

Partition Weight Factors = 0.500, 0.500

END

END

RUN DEFINITION:

Definition File = C:/userMY/TestRun/TestsimulationP.def

Initial Values File = \

C:/userMY/TestRun/Testsimulation_003.dir/2322_full.bak

Interpolate Initial Values = Off

Run Mode = Full

END

SOLVER STEP CONTROL:

Runtime Priority = Standard

EXECUTABLE SELECTION:

Double Precision = Off

END

MEMORY CONTROL:

Memory Allocation Factor = 1.0

END

PARALLEL ENVIRONMENT:

Number of Processes = 2

Start Method = MPICH Local Parallel for Windows

Parallel Host List = iherecfxmodeld*2

END

END END FLOW:

DOMAIN: Default Domain

Coord Frame = Coord 0

Domain Type = Fluid

Fluids List = Water

Location = Assembly

Particles List = Tracer xxxxxxxxx "Inlet and Outlet"

BOUNDARY: walls

Boundary Type = WALL

Location = walls

BOUNDARY CONDITIONS:

WALL INFLUENCE ON FLOW:

Option = No Slip

END

END

FLUID: Tracer

BOUNDARY CONDITIONS:

VELOCITY:

Option = Restitution Coefficient

Parallel Coefficient of Restitution = 1.0

Perpendicular Coefficient of Restitution = 0.8

END

END

END

END

BOUNDARY: freesurface

Boundary Type = WALL

Location = freesurface

BOUNDARY CONDITIONS:

WALL INFLUENCE ON FLOW:

Option = Free Slip

END

END

FLUID: Tracer

BOUNDARY CONDITIONS:

VELOCITY:

Option = Restitution Coefficient

Parallel Coefficient of Restitution = 1.0

Perpendicular Coefficient of Restitution = 0.8

END

END

END

END

BOUNDARY: sen

Boundary Type = WALL

Location = Default 2D Region

BOUNDARY CONDITIONS:

WALL INFLUENCE ON FLOW:

Option = No Slip

END

END

FLUID: Tracer

BOUNDARY CONDITIONS:

VELOCITY:

Option = Restitution Coefficient

Parallel Coefficient of Restitution = 1.0

Perpendicular Coefficient of Restitution = 0.8

END

END

END

END

DOMAIN MODELS:

BUOYANCY MODEL:

Option = Non Buoyant

END

DOMAIN MOTION:

Option = Stationary

END

REFERENCE PRESSURE:

Reference Pressure = 1 [atm]

END

END

FLUID: Tracer

FLUID MODELS:

MORPHOLOGY:

Option = Dispersed Particle Transport Fluid

PARTICLE DIAMETER DISTRIBUTION:

Maximum Diameter = 0.0005 [m]

Mean Diameter = 0.00025 [m]

Minimum Diameter = 0.00005 [m]

Option = Normal in Diameter by Mass

Standard Deviation in Diameter = 7e-05 [m]

END

END

END

END

FLUID: Water

FLUID MODELS:

MORPHOLOGY:

Option = Continuous Fluid

END

END

END

FLUID MODELS:

COMBUSTION MODEL:

Option = None

END

HEAT TRANSFER MODEL:

Option = None

END

THERMAL RADIATION MODEL:

Option = None

END

TURBULENCE MODEL:

Option = SST

END

TURBULENT WALL FUNCTIONS:

Option = Automatic

END

END

FLUID PAIR: Water | Tracer

Particle Coupling = One-way Coupling

MOMENTUM TRANSFER:

DRAG FORCE:

Option = Schiller Naumann

END

PRESSURE GRADIENT FORCE:

Option = None

END

TURBULENT DISPERSION FORCE:

Option = None

END

VIRTUAL MASS FORCE:

Option = None

END

END

END

INITIALISATION:

Option = Automatic

INITIAL CONDITIONS:

Velocity Type = Cartesian

CARTESIAN VELOCITY COMPONENTS:

Option = Automatic

END

EPSILON:

Option = Automatic

END

K:

Option = Automatic

END

STATIC PRESSURE:

Option = Automatic

END

END

END

PARTICLE INJECTION REGION: Particle Injection Region 1

FLUID: Tracer

INJECTION CONDITIONS:

INJECTION METHOD:

Cone Angle = 25.0 [deg]

Injection Centre = 0 [m], 0.65 [m], -0.8 [m]

Injection Velocity Magnitude = 0.001 [m s^-1]

Option = Cone

INJECTION DIRECTION:

Injection Direction X Component = 0

Injection Direction Y Component = 0

Injection Direction Z Component = 1

Option = Cartesian Components

END

NUMBER OF POSITIONS:

Number per Unit Time and Mass Flow Rate = 0.0001 [kg^-1]

Option = Proportional to Mass Flow Rate

END

END

PARTICLE MASS FLOW RATE:

Mass Flow Rate = 0.01 [kg s^-1]

END

END

END

END

END

OUTPUT CONTROL:

MONITOR OBJECTS:

Monitor Coefficient Loop Convergence = False

MONITOR BALANCES:

Option = Full

END

MONITOR FORCES:

Option = Full

END

MONITOR PARTICLES:

Option = Full

END

MONITOR RESIDUALS:

Option = Full

END

MONITOR TOTALS:

Option = Full

END

END

PARTICLE TRACK FILE:

Keep Track File = On

Option = All Track Positions

Track File Format = formatted

Track Positions = Control Volume Faces

END

RESULTS:

File Compression Level = Default

Option = Standard

END

TRANSIENT RESULTS: Transient Results 1

File Compression Level = Default

Option = Standard

Time Interval = 0.2 [s]

END

END

SIMULATION TYPE:

Option = Transient

INITIAL TIME:

Option = Automatic with Value

Time = 0 [s]

END

TIME DURATION:

Option = Total Time

Total Time = 40 [s]

END

TIME STEPS:

Option = Timesteps

Timesteps = 0.2 [s]

END

END

SOLUTION UNITS:

Angle Units = [rad]

Length Units = [m]

Mass Units = [kg]

Solid Angle Units = [sr]

Temperature Units = [K]

Time Units = [s]

END

SOLVER CONTROL:

ADVECTION SCHEME:

Option = High Resolution

END

CONVERGENCE CONTROL:

Maximum Number of Coefficient Loops = 4

Timescale Control = Coefficient Loops

END

CONVERGENCE CRITERIA:

Conservation Target = 0.01

Residual Target = 1e-04

Residual Type = RMS

END

PARTICLE CONTROL:

PARTICLE INTEGRATION:

Option = Forward Euler

END

END

TRANSIENT SCHEME:

Option = Second Order Backward Euler

END

END END COMMAND FILE:

Version = 10.0

Results Version = 10.0 END


James April 17, 2006 00:05

Re: particle tracking
 
Hi,

Did you see the particle number changes during the run in solver? You may need to check your tracer input condition if the particle number is 0

And the purpose of setting monitoring points is to get tracer curves.

Regards!

James


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