96 lines
4.4 KiB
Text
96 lines
4.4 KiB
Text
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2012 OpenFOAM Foundation
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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\page pageBoundaryConditions Boundary Conditions
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\ref grpBoundaryConditions are required to 'close' the simulation problem.
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Careful attention should be applied to their selection so as to create a
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well-posed system of equations, which can be solved numerically.
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\section secBoundaryConditionsOverview Overview
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The set of available \ref grpBoundaryConditions comprise of basic, turbulent and
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thermophysical types.
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\subsection secBC1 Basic boundary conditions
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- \ref grpConstraintBoundaryConditions
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- \ref grpInletBoundaryConditions
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- \ref grpOutletBoundaryConditions
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- \ref grpGenericBoundaryConditions
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- \ref grpCoupledBoundaryConditions
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- \ref grpWallBoundaryConditions
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\subsection secBC2 Turbulent flow boundary conditions
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- \ref grpRASBoundaryConditions
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\subsection secBC3 Thermophysical boundary conditions
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- \ref grpThermoBoundaryConditions
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\section secWallFunctions Wall functions
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Wall functions in OpenFOAM are modelled as boundary conditions, applied to
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the viscosity for momentum, and thermal diffusivity for energy. Two groups of
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wall functions are available, which vary in terms of the underlying
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compressibility assumption.
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Wall functions for incompressible flow
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- \ref grpIcoWallFunctions
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Wall functions for compressible flow
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- \ref grpCmpWallFunctions
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\section secBoundaryConditions Typical usage for pressure-velocity systems
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The choice as to the most appropriate set of boundary conditions is dictated by
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the type of flow problem. In many cases, multiple possible selections exist;
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the following tables offer suggestions for subsonic flow.
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subsonic inlet (flow specified):
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\table
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Variable | Symbol | Type
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pressure | p | \link Foam::zeroGradientFvPatchField zeroGradient\endlink
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velocity | U | \link Foam::fixedValueFvPatchField fixedValue\endlink
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transported property | - | \link Foam::fixedValueFvPatchField fixedValue\endlink
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derived property | - | \link Foam::calculatedFvPatchField calculated\endlink or \link Foam::zeroGradientFvPatchField zeroGradient\endlink
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\endtable
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subsonic outlet:
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\table
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Variable | Symbol | Type
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pressure | p | \link Foam::fixedValueFvPatchField fixedValue\endlink
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velocity | U | \link Foam::inletOutletFvPatchField inletOutlet\endlink or \link Foam::pressureInletOutletVelocityFvPatchVectorField pressureInletOutletVelocity\endlink
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transported property | - | \link Foam::inletOutletFvPatchField inletOutlet\endlink
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derived property | - | \link Foam::calculatedFvPatchField calculated\endlink or \link Foam::zeroGradientFvPatchField zeroGradient\endlink
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\endtable
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wall (impermeable, non-slip):
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\table
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Variable | Symbol | Type
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pressure | p | \link Foam::zeroGradientFvPatchField zeroGradient\endlink
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velocity | U | \link Foam::fixedValueFvPatchField fixedValue\endlink
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transported property | - | \link Foam::fixedValueFvPatchField fixedValue\endlink
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derived property | - | \link Foam::calculatedFvPatchField calculated\endlink or \link Foam::zeroGradientFvPatchField zeroGradient\endlink
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\endtable
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\*---------------------------------------------------------------------------*/
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