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Boundary and Initial condition
- Initial and boundary conditions are stored in directories named with numbers
- Number in directory name stands for time layer of the solution
- Usually initial conditions are stored in directory 0
- In case of solver icoFoam one imposes pressure p and velocity U.
- It is necessary to impose initial and boundary conditions in the first time layer (typically 0 )
- Let us take a look for example at the pressure:
# cat $FOAM_RUN/icoFoam/cavity/0/p/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class volScalarField; object p; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //dimensions [0 2 -2 0 0 0 0];
- Parameter dimensions stands for physical dimensions according to SI unit system:
SI [kg m s K mol A cd], e.g. for pressure:
(kinematic pressure)internalField uniform 0;
- Parameter internalField defines values in cell volumes of the mesh
- Values can be constant all over the flow field (uniform) with corresponding value
- Or values can be non-constant (nonuniform, i.e. possibly different value in each cell) with list of values (according to cell IDs)
boundaryField { movingWall { type zeroGradient; } fixedWalls { type zeroGradient; } frontAndBack { type empty; } } // ************************************************************************* // - boundaryField defines boundary conditions for mesh boundaries
- type defines real boundary condition
- e.g. zeroGradient is so called homogeneous Neumann boundary condition, which means that quantity gradient is zero in direction perpendicular to the boundary
- Boundary condition empty means, that there is no flow in direction perpendicular to the boundary, this boundary condition must correspond to definition in polyMesh/boundary
- Let us take a look at the velocity file :
# cat $FOAM_RUN/icoFoam/cavity/0/U/*--------------------------------*- C++ -*----------------------------------*\ | ========= | | | \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | | \\ / O peration | Version: 2.2.1 | | \\ / A nd | Web: www.OpenFOAM.com | | \\/ M anipulation | | \*---------------------------------------------------------------------------*/ FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { movingWall { type fixedValue; value uniform (1 0 0); } fixedWalls { type fixedValue; value uniform (0 0 0); } frontAndBack { type empty; } } // ************************************************************************* // - Velocity U is a vector and has three components (Ux, Uy, Uz)
- At the wall there is often prescribed fixed value for velocity (Dirichlet boundary condition): fixedValue, which needs its value, either uniform or nonuniform
- Condition uniform (0 0 0) means the velocity is zero at the wall
- Condition uniform (1 0 0) means the velocity is 1 m/s in magnitude and points in the direction of the coordinate x axis (wall is moving)
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Index
- Add layers
- Meshing options: Snappy hex
- Additional data files
- Post-processing
- advance ratio
- Propeller Efficiency
- alpha.vapor
- Multiphase cavitation
- alpha.water
- Multiphase cavitation
- Averaging window
- Post-processing
- Axis
- Reference frames | Step by step guide | Step by step guide | Step by step guide
- Background mesh size
- Components | Components | Components
- Bind to core
- Simulation
- blade
- Components
- Blade cap gap
- Components
- Blade to blade views
- Post-processing
- blade-to-blade view
- Example: Blade-to-blade view | Step by step guide | Step by step guide | Advanced parameters
- bladeCap
- Components
- bladeHubFillets
- Components
- bladeLeadingEdge
- Components
- bladePressureSide
- Components
- bladeShroudFillets
- Components
- bladeSuctionSide
- Components
- bladeTrailingEdge
- Components
- Bounding box
- Components | Components
- Bounding box point 1
- Components
- Bounding box point 2
- Components
- Castellated mesh
- Meshing options: Snappy hex
- cavitation
- Physics | Physics | Physics
- Cavitation index
- Cavitation Modeling in TCFD
- Cavitation risk
- Physics | Physics | Physics | Cavitation Modeling in TCFD
- Multiphase cavitation
- Physics | Cavitation Modeling in TCFD | Multiphase cavitation
- Schnerr-Sauer model
- Physics | Cavitation Modeling in TCFD | Multiphase cavitation | Multiphase cavitation | Keywords in .tcfd file
- Cell data to point data
- Step by step guide | Usage
- cell-centered
- Cell Centered Approach
- Cells between levels
- Meshing options: Snappy hex
- cellZone
- MRF
- CFD Processor
- CFD Processor & TCFD | CFD Processor & TCFD | General settings | Simulation | Physics | Components
- Check Setup
- General settings
- circumferential angle
- Boundary condition: Inlet | Boundary condition: Inlet
- Clip filter
- Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide
- Clip out radius
- Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Clipped boundary is hub
- Component name
- Components
- Compressible
- Physics
- constant transport
- Physics
- Contour
- Step by step guide
- Convergence check
- Simulation | Speedlines | Speedlines
- cutWater
- Components
- Cylindrical grading
- Components
- Cylindrical mesh
- Components
- Cylindrical radii
- Components
- Cylindrical warp
- Components
- Debug output
- Advanced parameters
- density
- Physics
- Directed mass flow rate
- Boundary condition: Inlet
- Directed volumetric flow rate
- Boundary condition: Inlet
- Directory with STL files
- Components
- Dynamic viscosity
- Physics | Physics | Physics
- Efficiency probes
- Post-processing
- Einstein summation
- Compressible Mathematical Model
- empty
- Components
- Euler alpha
- Components
- Euler beta
- Components
- Euler gamma
- Components
- Extension Points
- Advanced parameters
- External Fluent mesh
- Components
- External OpenFOAM mesh
- Components
- Extract block
- Step by step guide
- Feature edges included angle
- Meshing options: Snappy hex
- Finite Volume Method
- Finite Volume Method
- Fixed velocity
- Boundary condition: Inlet | Boundary condition: Inlet
- Flow direction
- Components | Components
- Fluid name
- Physics
- Forces
- Post-processing
- freestreamInterface
- Components
- Frozen rotor
- Frozen Rotor vs. Mixing
- fvSolution
- Number of Iterations on | Minimal and Maximal Values
- Glyph
- Usage
- Gravitational acceleration
- Physics
- Group by point
- Post-processing
- Heat capacity
- Physics | Physics
- Heat capacity ratio
- Physics
- Hosts
- Simulation
- hub
- Components
- Information
- Step by step guide | Step by step guide | Step by step guide
- Initial pressure
- Initial conditions
- Initial temperature
- Initial conditions
- Initial turbulent dissipation
- Initial conditions
- Initial turbulent dissipation rate
- Initial conditions
- Initial turbulent energy
- Initial conditions
- Initial velocity
- Initial conditions
- inlet
- Components
- inletInterface
- Components
- Inner radius
- Step by step guide
- Internal point
- Components | Components
- internalAMI
- Components
- Iterations
- Advanced parameters | Advanced parameters
- Kinematic viscosity
- Physics
- Leading edge gap
- Components
- License.dat
- Installation
- License.key
- Installation
- linear solver
-
- diagonal
- System of Linear Equations
- diagonalSolver
- System of Linear Equations
- DIC
- System of Linear Equations
- DILU
- System of Linear Equations
- FDIC
- System of Linear Equations
- GAMG
- System of Linear Equations | System of Linear Equations
- none
- System of Linear Equations
- PBiCG
- System of Linear Equations
- smoothSolver
- System of Linear Equations
- BICCG
- System of Linear Equations
- localhost
- Simulation | Simulation
- Mass flow rate
- Boundary condition: Inlet | Boundary condition: Inlet
- Max global cells
- Meshing options: Snappy hex
- Max load unbalance
- Meshing options: Snappy hex
- Max local cells
- Meshing options: Snappy hex
- Max pressure
- Boundary condition: Outlet
- Maximal density
- Simulation controls
- Maximal pressure
- Simulation controls
- Maximal temperature
- Simulation controls
- Maximal velocity
- Simulation controls
- Meridion average
- Step by step guide | Step by step guide
- meridional angle
- Boundary condition: Inlet
- Meridional average
- Turbo Blade Post | Post-processing | Example: Meridional average | Step by step guide | Step by step guide | Meridional Average filter -
- Mesh parts
- Step by step guide | Step by step guide | Step by step guide | Step by step guide
- Message Passing Interface
- Simulation
- Min refinement
- Meshing options: Snappy hex
- Minimal density
- Simulation controls
- Minimal pressure
- Simulation controls
- Minimal temperature
- Simulation controls
- Mixing plane
- Components | Components | Frozen Rotor vs. Mixing
- Molar weight
- Physics | Physics
- MPI
- Simulation | Message Passing Interface (MPI)
- MRF
- Geometry & Mesh | Geometry & Mesh | Geometry & Mesh | Geometry & Mesh
- MRF zone
- Geometry & Mesh | Geometry & Mesh
- Multi-block Dataset
- Step by step guide | Step by step guide | Step by step guide
- Multi-solid STL file
- Components
- Multiple Reference Frame
- MRF
- Name
- Reference frames
- Navier-Stokes equations
- Incompressible Mathematical Model
- No. periodic segments
- Components
- Non-ortho correctors
- Simulation controls
- non-orthogonal correctors
- Simulation controls | Non-Orthogonal Correctors
- Normalize patches
- Advanced parameters
- Numerical order
- Simulation
- Origin
- Reference frames | Components | Step by step guide | Step by step guide | Step by step guide
- Outer radius
- Step by step guide
- outlet
- Components
- Outlet vent
- Boundary condition: Outlet
- outletInterface
- Components
- ParaView
- CFD Processor & TCFD | ParaView | Simulation | Simulation | Step by step guide | Advanced parameters
- ParaView filter
- TCFDSource plugin
- ParaView source
- TCFDSource plugin
- Patches table
- Components | Components
- Pipeline Browser
- When using GUI: | TCFDSource plugin | TCFDSource plugin | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide
- Plot Data
- Step by step guide
- Point iterations
- Speedlines
- Prandtl number
- Physics
- pressure - velocity coupling
- SIMPLE Algorithm
- Processors
- Simulation | Simulation | Simulation
- Properties panel
- TCFDSource plugin
- Reference density
- Physics | Cavitation Risk and Cavitation
- Reference frame
- Components
- Reference pressure
- Physics | Cavitation Risk and Cavitation
- Reference temperature
- Physics | Cavitation Risk and Cavitation
- Relaxation
- Boundary condition: Outlet
- Remove split cells
- Advanced parameters
- RenderView
- TCFDSource plugin | Components | Components | Components | Components | Components
- Report mass flow unit
- Post-processing
- Report pressure unit
- Post-processing
- Report quantity
- Post-processing
- Report sections
- Post-processing
- Report temperature unit
- Post-processing
- Report volumetric flow unit
- Post-processing
- Resistance
- Boundary condition: Outlet
- resolution
- Step by step guide | Advanced parameters | Advanced parameters
- Resolve feature angle
- Meshing options: Snappy hex
- Rotating checkbox
- Reference frames
- Rotation speed
- Reference frames
- rotationAMI
- Components
- saturated vapor pressure
- Cavitation Risk and Cavitation
- Scale factor
- Components
- scheme
-
- divergence scheme
-
- biLinearFit
- Spatial Integration Numerical Scheme
- blended
- Spatial Integration Numerical Scheme
- clippedLinear
- Spatial Integration Numerical Scheme
- CoBlended
- Spatial Integration Numerical Scheme
- cubic
- Spatial Integration Numerical Scheme
- cubicUpwindFit
- Spatial Integration Numerical Scheme
- downwind
- Spatial Integration Numerical Scheme
- filteredLinear
- Spatial Integration Numerical Scheme
- filteredLinear2
- Spatial Integration Numerical Scheme
- filteredLinear3
- Spatial Integration Numerical Scheme
- fixedBlended
- Spatial Integration Numerical Scheme
- Gamma
- Spatial Integration Numerical Scheme
- Gamma01
- Spatial Integration Numerical Scheme
- harmonic
- Spatial Integration Numerical Scheme
- limitedCubic
- Spatial Integration Numerical Scheme
- limitedCubic01
- Spatial Integration Numerical Scheme
- limitedGamma
- Spatial Integration Numerical Scheme
- limitedLimitedCubic
- Spatial Integration Numerical Scheme
- limitedLimitedLinear
- Spatial Integration Numerical Scheme
- limitedLinear
- Spatial Integration Numerical Scheme | Spatial Integration Numerical Scheme
- limitedLinear01
- Spatial Integration Numerical Scheme
- limitedMUSCL
- Spatial Integration Numerical Scheme
- limitedVanLeer
- Spatial Integration Numerical Scheme
- limiterBlended
- Spatial Integration Numerical Scheme
- limitWith
- Spatial Integration Numerical Scheme
- linear
- Spatial Integration Numerical Scheme
- linearFit
- Spatial Integration Numerical Scheme
- linearPureUpwindFit
- Spatial Integration Numerical Scheme
- linearUpwind
- Spatial Integration Numerical Scheme
- localBlended
- Spatial Integration Numerical Scheme
- localMax
- Spatial Integration Numerical Scheme
- localMin
- Spatial Integration Numerical Scheme
- LUST
- Spatial Integration Numerical Scheme
- midPoint
- Spatial Integration Numerical Scheme
- Minmod
- Spatial Integration Numerical Scheme
- MUSCL
- Spatial Integration Numerical Scheme
- MUSCL01
- Spatial Integration Numerical Scheme
- OSPRE
- Spatial Integration Numerical Scheme
- outletStabilised
- Spatial Integration Numerical Scheme
- pointLinear
- Spatial Integration Numerical Scheme
- quadraticFit
- Spatial Integration Numerical Scheme
- quadraticLinearFit
- Spatial Integration Numerical Scheme
- quadraticLinearUpwindFit
- Spatial Integration Numerical Scheme
- quadraticUpwindFit
- Spatial Integration Numerical Scheme
- QUICK
- Spatial Integration Numerical Scheme
- reverseLinear
- Spatial Integration Numerical Scheme
- SFCD
- Spatial Integration Numerical Scheme
- skewCorrected
- Spatial Integration Numerical Scheme
- SuperBee
- Spatial Integration Numerical Scheme
- UMIST
- Spatial Integration Numerical Scheme
- upwind
- Spatial Integration Numerical Scheme
- vanAlbada
- Spatial Integration Numerical Scheme
- vanLeer
- Spatial Integration Numerical Scheme
- vanLeer01
- Spatial Integration Numerical Scheme
- weighted
- Spatial Integration Numerical Scheme
- SetEntry
- Scripting
- Settings
- When using GUI:
- Setup file
- General settings
- shroud
- Components
- SIMPLE algorithm
- SIMPLE Algorithm
- Simulation type
- General settings
- Slice filter
- Step by step guide
- Snap internal points
- Advanced parameters | Advanced parameters
- Snapshot fields
- Post-processing
- Snapshot interval
- Post-processing
- solver
-
- blueDyMSolver
- blueDyMSolver - transient, incompressible
- blueSolver
- blueSolver - steady state,
- greenDyMSolver
- greenDyMSolver - transient, cavitation
- greenSolver
- greenSolver - steady state,
- interPhaseChangeDyMFoam
- greenDyMSolver - transient, cavitation
- interPhaseChangeFoam
- greenSolver - steady state,
- pimpleDyMFoam
- blueDyMSolver - transient, incompressible
- redDyMSolver
- redDyMSolver - transient, compressible
- redSolver
- redSolver - steady state,
- rhoSimpleFoam
- redSolver - steady state,
- simpleFoam
- blueSolver - steady state,
- sonicFoam
- redDyMSolver - transient, compressible
- Solver steady state
- Simulation
- Solver transient
- Simulation
- Specific heat capacity
- Physics
- Speedline points
- Speedlines
- Speedlines
- Speedlines
- Statistics
- Step by step guide | Step by step guide | Step by step guide
- steady-state
- Steady-State
- Stream path
- Post-processing
- Surface hook-up
- Meshing options: Snappy hex
- SurfaceLIC
- Step by step guide | Usage
- Sutherland transport
- Physics
- symmetry
- Components
- TCFDManager
- CFD Processor & TCFD | CFD Processor & TCFD | When using GUI: | TCFDSource plugin
- TCFDSource
- CFD Processor & TCFD | CFD Processor & TCFD | TCFDSource plugin | TCFDSource plugin | TCFDSource plugin | TCFDSource plugin | Turbulence
- Time management
- Simulation
- Toggle advanced properties
- TCFDSource plugin | Step by step guide
- Tolerance
- Advanced parameters | Advanced parameters
- Total pressure
- Boundary condition: Inlet | Boundary condition: Inlet
- Total temperature
- Boundary condition: Inlet
- Trailing edge gap
- Components
- transient
- Simulation
- Transient times
- Speedlines
- Transient window
- Post-processing
- translationAMI
- Components
- Transport model
- Physics
- Turbo Blade Post
- Turbo Blade Post | Example: Pressure around the | Example: Blade pressure and
- Turbo Unwrap
- Turbo Blade Post | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Step by step guide | Usage
- turbulence model
- Turbulence
- kEpsilon
- Turbulence
- kOmegaSST
- Turbulence
- laminar
- Turbulence
- Spalart-Allmaras
- Turbulence
- Turbulence settings
- Turbulence
- Turbulent dissipation
- Boundary condition: Inlet
- Turbulent eddy viscosity
- Boundary condition: Inlet
- Turbulent energy intensity
- Boundary condition: Inlet
- Under-Relaxation
- Under-Relaxation
- under-relaxation factors
- Simulation controls
- Unstructured grid
- Step by step guide
- Unwrap mesh
- Step by step guide | Step by step guide | Step by step guide
- Use fluid defaults
- Physics
- Use refinement regions
- Components
- User gap refinement
- Components
- Value Range
- Step by step guide
- Volume fields
- Step by step guide | Step by step guide | Step by step guide | Step by step guide
- Volumetric flow rate
- Boundary condition: Inlet | Boundary condition: Inlet
- wall
- Components
- wallSlip
- Components
- Wheel diameter
- Components | Components
- WriteFile
- Scripting
