241 lines
7.0 KiB
C++
241 lines
7.0 KiB
C++
/*---------------------------------------------------------------------------*\
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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) 2012-2016 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
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::functionObjects::pressure
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Group
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grpFieldFunctionObjects
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Description
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This function object includes tools to manipulate the pressure into
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different forms. These currently include:
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- static pressure
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\f[
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p = \rho p_k
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\f]
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- total pressure
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\f[
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p_0 = p_{ref} + p + 0.5 \rho |U|^2
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\f]
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- static pressure coefficient
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\f[
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Cp = \frac{p - p_{\inf}}{0.5 \rho_{\inf} |U_{\inf}|^2}
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\f]
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- total pressure coefficient
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\f[
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Cp_0 = \frac{p_0 - p_{\inf}}{0.5 \rho_{\inf} |U_{\inf}|^2}
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\f]
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where
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\vartable
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\rho | Density [kg/m3]
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U | Velocity [m/s]
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\rho_{\inf} | Freestream density [kg/m3]
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p_{\inf} | Freestream pressure [Pa]
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U_{\inf} | Freestream velocity [m/s]
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p_k | Kinematic pressure (p/rho)[m2/s2]
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p | Pressure [Pa]
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p_0 | Total pressure [Pa]
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p_{ref} | Reference pressure level [Pa]
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Cp | Pressure coefficient
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Cp_0 | Total pressure coefficient
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\endvartable
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The function object will operate on both kinematic (\f$ p_k \f$) and static
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pressure (\f$ p \f$) fields, and the result is written as a
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volScalarField.
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The modes of operation are:
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\table
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Mode | calcTotal | calcCoeff
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Static pressure | no | no
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Total pressure | yes | no
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Pressure coefficient | no | yes
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Total pressure coefficient | yes | yes
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\endtable
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Example of function object specification to calculate pressure coefficient:
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\verbatim
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pressure1
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{
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type pressure;
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libs ("libfieldFunctionObjects.so");
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...
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calcTotal no;
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calcCoeff yes;
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}
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\endverbatim
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Usage
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\table
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Property | Description | Required | Default value
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type | type name: pressure | yes |
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field | Name of the pressure field | no | p
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U | Name of the velocity field | no | U
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rho | Name of the density field | no | rho
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result | Name of the resulting field | no | derived from p
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calcTotal | Calculate total coefficient | yes |
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pRef | Reference pressure for total pressure | no | 0
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calcCoeff | Calculate pressure coefficient | yes |
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pInf | Freestream pressure for coefficient calculation | no |
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UInf | Freestream velocity for coefficient calculation | no |
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rhoInf | Freestream density for coefficient calculation | no |
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\endtable
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See also
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Foam::functionObjects::fieldExpression
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Foam::functionObjects::fvMeshFunctionObject
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SourceFiles
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pressure.C
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\*---------------------------------------------------------------------------*/
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#ifndef functionObjects_pressure_H
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#define functionObjects_pressure_H
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#include "fieldExpression.H"
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#include "volFieldsFwd.H"
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#include "dimensionedScalar.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace functionObjects
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{
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/*---------------------------------------------------------------------------*\
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Class pressure Declaration
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\*---------------------------------------------------------------------------*/
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class pressure
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:
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public fieldExpression
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{
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// Private data
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//- Name of velocity field, default is "U"
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word UName_;
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//- Name of density field, default is "rho"
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word rhoName_;
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// Total pressure calculation
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//- Flag to calculate total pressure
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bool calcTotal_;
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//- Reference pressure level
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scalar pRef_;
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// Pressure coefficient calculation
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//- Flag to calculate pressure coefficient
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bool calcCoeff_;
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//- Freestream pressure
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scalar pInf_;
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//- Freestream velocity
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vector UInf_;
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//- Freestream density
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scalar rhoInf_;
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// Private Member Functions
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//- Return the name of the derived pressure field
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word resultName() const;
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//- Multiply the static pressure p by rhoInf if necessary and return
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tmp<volScalarField> rhoScale(const volScalarField& p) const;
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//- Multiply the given field by rho or rhoInf as appropriate and return
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tmp<volScalarField> rhoScale
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(
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const volScalarField& p,
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const tmp<volScalarField>& tsf
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) const;
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//- Return the reference pressure
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tmp<volScalarField> pRef(const tmp<volScalarField>& tp) const;
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//- Calculate and return the dynamic pressure
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tmp<volScalarField> pDyn
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(
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const volScalarField& p,
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const tmp<volScalarField>& tp
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) const;
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//- Convert to coeff by applying the freestream dynamic pressure scaling
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tmp<volScalarField> coeff(const tmp<volScalarField>& tp) const;
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//- Calculate the derived pressure field and return true if successful
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virtual bool calc();
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public:
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//- Runtime type information
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TypeName("pressure");
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// Constructors
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//- Construct from Time and dictionary
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pressure
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(
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const word& name,
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const Time& runTime,
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const dictionary&
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);
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//- Destructor
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virtual ~pressure();
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// Member Functions
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//- Read the pressure data
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virtual bool read(const dictionary&);
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace functionObjects
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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