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第三类边界条件openfoam已经有现成的呢，可以直接调用。而边界上某个点的温度，可以用探针，通过点的坐标读取。

我有一个疑问，有没有什么可靠的实验或者理论方法用于检验大涡模拟的可靠性（DNS除外）？换一种表述方式就是：文献提出的大涡模拟的要求是否具有普适性？在特殊的工况是否应该有更高或者更低的要求。

@regina 一个直观的感觉是，网格越小需要解析的小涡就越多，而小涡本只有统计性，所以计算误差较大吧。

@Jhhu 你好，我最后没有成功，由于时间很紧张，还是使用了商用软件。

@东岳 好的谢谢东岳老师，我试一下

有人知道下面这种错误的原因吗？

myicoFoam: symbol lookup error: /home/a/OpenFOAM/a-5.x/platforms/linux64GccDPInt32Opt/lib/libnewFvPatchScalarField.so: undefined symbol: _ZN4Foam21newFvPatchScalarFieldC1ERKNS_7fvPatchERKNS_16DimensionedFieldIdNS_7volMeshEEERKNS_10dictionaryE

检查发现是在字典中少将libs 写成了lib，修改之后还是出错，不过边界条件可以识别了。

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0


PISO: Operating solver in PISO mode

Reading transportProperties

Reading field p

Reading field U

Reading field C

Reading/calculating face flux field phi


Starting time loop

Time = 5e-05

Courant Number mean: 7.5e-05 max: 0.194817
smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 2.38974e-06, No Iterations 8
smoothSolver:  Solving for Uy, Initial residual = 0, Final residual = 0, No Iterations 0
#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigFpe::sigHandler(int) at ??:?
#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3  Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) at ??:?
#4  Foam::operator/(Foam::UList<double> const&, Foam::UList<double> const&) at ??:?
#5  Foam::newFvPatchScalarField::updateCoeffs() at ??:?
#6  Foam::fvMatrix<double>::fvMatrix(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::dimensionSet const&) at ??:?
#7  Foam::fv::gaussLaplacianScheme<double, Foam::SymmTensor<double> >::fvmLaplacianUncorrected(Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) at ??:?
#8  Foam::fv::gaussLaplacianScheme<double, double>::fvmLaplacian(Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) at ??:?
#9  ? at ??:?
#10  ? at ??:?
#11  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#12  ? at ??:?
浮点数例外 (核心已转储)

C文件

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "newFvPatchScalarField.H"
#include "addToRunTimeSelectionTable.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "surfaceFields.H"

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::newFvPatchScalarField::newFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(p, iF)

{}


Foam::newFvPatchScalarField::newFvPatchScalarField
(
    const newFvPatchScalarField& ptf,
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchScalarField(ptf, p, iF, mapper)

{}


Foam::newFvPatchScalarField::newFvPatchScalarField
(
    const fvPatch& p,
    const DimensionedField<scalar, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchScalarField(p, iF, dict, false)
 
{

}


Foam::newFvPatchScalarField::newFvPatchScalarField
(
    const newFvPatchScalarField& tppsf
)
:
    fixedValueFvPatchScalarField(tppsf)

{}


Foam::newFvPatchScalarField::newFvPatchScalarField
(
    const newFvPatchScalarField& tppsf,
    const DimensionedField<scalar, volMesh>& iF
)
:
    fixedValueFvPatchScalarField(tppsf, iF)

{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void Foam::newFvPatchScalarField::autoMap
(
    const fvPatchFieldMapper& m
)
{
    fixedValueFvPatchScalarField::autoMap(m);

}


void Foam::newFvPatchScalarField::rmap
(
    const fvPatchScalarField& ptf,
    const labelList& addr
)
{
    fixedValueFvPatchScalarField::rmap(ptf, addr);

}


void Foam::newFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }

    const volScalarField& C =
        db().lookupObject<volScalarField>("C");
    gradient_=0.5*C;

    operator==
    (
        this->patchInternalField()+gradient_/this->patch().deltaCoeffs()
    );

    fixedValueFvPatchScalarField::updateCoeffs();
}


//void Foam::newFvPatchScalarField::write(Ostream& os) const
//{
//    fvPatchScalarField::write(os);
//}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
    makePatchTypeField
    (
        fvPatchScalarField,
        newFvPatchScalarField
    );
}

// ************************************************************************* //

H文件

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::newFvPatchScalarField

Group
    grpInletBoundaryConditions grpOutletBoundaryConditions

Description
    This boundary condition provides a total temperature condition.

Usage
    \table
        Property     | Description             | Required    | Default value
        U            | Velocity field name     | no          | U
        phi          | Flux field name         | no          | phi
        psi          | Compressibility field name | no       | thermo:psi
        gamma        | ratio of specific heats (Cp/Cv) | yes |
        T0           | reference temperature   | yes         |
    \endtable

    Example of the boundary condition specification:
    \verbatim
    <patchName>
    {
        type            new;
        T0              uniform 300;
    }
    \endverbatim

SourceFiles
    newFvPatchScalarField.C

See also
    Foam::fixedValueFvPatchField

\*---------------------------------------------------------------------------*/

#ifndef newFvPatchScalarField_H
#define newFvPatchScalarField_H

#include "fixedValueFvPatchFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
             Class newFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/

class newFvPatchScalarField
:
    public fixedValueFvPatchScalarField
{
    // Private data

    scalarField gradient_;       


public:

    //- Runtime type information
    TypeName("new");


    // Constructors

        //- Construct from patch and internal field
        newFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct from patch, internal field and dictionary
        newFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given newFvPatchScalarField
        //  onto a new patch
        newFvPatchScalarField
        (
            const newFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fvPatchFieldMapper&
        );

        //- Construct as copy
        newFvPatchScalarField
        (
            const newFvPatchScalarField&
        );

        //- Construct and return a clone
        virtual tmp<fvPatchScalarField> clone() const
        {
            return tmp<fvPatchScalarField>
            (
                new newFvPatchScalarField(*this)
            );
        }

        //- Construct as copy setting internal field reference
        newFvPatchScalarField
        (
            const newFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchScalarField> clone
        (
            const DimensionedField<scalar, volMesh>& iF
        ) const
        {
            return tmp<fvPatchScalarField>
            (
                new newFvPatchScalarField(*this, iF)
            );
        }


    // Member functions

        // Access

            //- Return the total pressure
       
            //- Return the total pressure
            const scalarField& gradient() const
            {
                return gradient_;
            }

            //- Return reference to the total pressure to allow adjustment
            scalarField& gradient()
            {
                return gradient_;
            }


        // Mapping functions

            //- Map (and resize as needed) from self given a mapping object
            virtual void autoMap
            (
                const fvPatchFieldMapper&
            );

            //- Reverse map the given fvPatchField onto this fvPatchField
            virtual void rmap
            (
                const fvPatchScalarField&,
                const labelList&
            );


        // Evaluation functions

            //- Update the coefficients associated with the patch field
            virtual void updateCoeffs();


        //- Write
        //virtual void write(Ostream&) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //

边界条件编译了， .so文件也添加到字典中了，还是提示Unknown patchField type newgrad for patch type wall，这个好让人困惑。。。

最近尝试修改，整理完成后边界可以编译了，但是放到计算文件中还是报错，提示错误如下，有人知道这是什么原因吗？

Unknown patchField type newgrad for patch type wall

Valid patchField types are :
（。。。。。（省略）
）
file: /home/a/temp/cavity/0/C.boundaryField.wall2flow from line 41 to line 41.

    From function static Foam::tmp<Foam::fvPatchField<Type> > Foam::fvPatchField<Type>::New(const Foam::fvPatch&, const Foam::DimensionedField<Type, Foam::volMesh>&, const Foam::dictionary&) [with Type = double]
    in file /home/a/OpenFOAM/OpenFOAM-5.x/src/finiteVolume/lnInclude/fvPatchFieldNew.C at line 134.

FOAM exiting

H文件

#ifndef newgradFvPatchScalarField_H
#define newgradFvPatchScalarField_H

#include "fixedValueFvPatchFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
             Class newgradFvPatchScalarField Declaration
\*---------------------------------------------------------------------------*/

class newgradFvPatchScalarField
:
    public fixedValueFvPatchScalarField
{
    // Private data

        //- Total pressure
        scalarField gradient_;

public:

    //- Runtime type information
    TypeName("newgrad");


    // Constructors

        //- Construct from patch and internal field
        newgradFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct from patch, internal field and dictionary
        newgradFvPatchScalarField
        (
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const dictionary&
        );

        //- Construct by mapping given newgradFvPatchScalarField
        //  onto a new patch
        newgradFvPatchScalarField
        (
            const newgradFvPatchScalarField&,
            const fvPatch&,
            const DimensionedField<scalar, volMesh>&,
            const fvPatchFieldMapper&
        );
        

        //- Construct as copy
         newgradFvPatchScalarField
        (
            const newgradFvPatchScalarField&
        );

        //- Construct and return a clone
        virtual tmp<fvPatchScalarField> clone() const
        {
            return tmp<fvPatchScalarField>
            (
                new newgradFvPatchScalarField(*this)
            );
        }


        //- Construct as copy setting internal field reference
        newgradFvPatchScalarField
        (
            const newgradFvPatchScalarField&,
            const DimensionedField<scalar, volMesh>&
        );

        //- Construct and return a clone setting internal field reference
        virtual tmp<fvPatchScalarField> clone
        (
            const DimensionedField<scalar, volMesh>& iF
        ) const
        {
            return tmp<fvPatchScalarField>
            (
                new newgradFvPatchScalarField(*this, iF)
            );
        }
        


    // Member functions

        // Access

            //- Return the total pressure
            const scalarField& gradient() const
            {
                return gradient_;
            }

            //- Return reference to the total pressure to allow adjustment
            scalarField& gradient()
            {
                return gradient_;
            }


        // Mapping functions

            //- Map (and resize as needed) from self given a mapping object
            virtual void autoMap
            (
                const fvPatchFieldMapper&
            );

            //- Reverse map the given fvPatchField onto this fvPatchField
            virtual void rmap
            (
                const fvPatchScalarField&,
                const labelList&
            );
        


        // Evaluation functions

            //- Update the coefficients associated with the patch field
            virtual void updateCoeffs();


        //- Write
        //virtual void write(Ostream&) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //

C文件

#include "newgradFvPatchScalarField.H"
#include "addToRunTimeSelectionTable.H"
#include "fvPatchFieldMapper.H"
#include "volFields.H"
#include "surfaceFields.H"
void Foam::newgradFvPatchScalarField::updateCoeffs()
{
    if (updated())
    {
        return;
    }
    
    const volScalarField& C =
        db().lookupObject<volScalarField>("C");
    gradient_=0.5*C;
    
    operator==
    (
        this->patchInternalField()+gradient_/this->patch().deltaCoeffs()
    );

    fixedValueFvPatchScalarField::updateCoeffs();
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
    makePatchTypeField
    (
        fvPatchScalarField,
        newgradFvPatchScalarField
    );
}

尝试编译过程发现提示.C的173行有问题

wmake libso .
g++ -std=c++11 -m64 -Dlinux64 -DWM_ARCH_OPTION=64 -DWM_DP -DWM_LABEL_SIZE=32 -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter -Wno-invalid-offsetof -O3  -DNoRepository -ftemplate-depth-100 -I/home/a/OpenFOAM/OpenFOAM-5.x/src/finiteVolume/lnInclude  -IlnInclude -I. -I/home/a/OpenFOAM/OpenFOAM-5.x/src/OpenFOAM/lnInclude -I/home/a/OpenFOAM/OpenFOAM-5.x/src/OSspecific/POSIX/lnInclude   -fPIC -c flowFvPatchScalarField.C -o Make/linux64GccDPInt32Opt/flowFvPatchScalarField.o
flowFvPatchScalarField.C: In member function ‘virtual void Foam::flowFvPatchScalarField::updateCoeffs()’:
flowFvPatchScalarField.C:173:48: error: qualified-id in declaration before ‘(’ token
 void Foam::flowFvPatchScalarField::updateCoeffs()
                                                ^
/home/a/OpenFOAM/OpenFOAM-5.x/wmake/rules/General/transform:25: recipe for target 'Make/linux64GccDPInt32Opt/flowFvPatchScalarField.o' failed
make: *** [Make/linux64GccDPInt32Opt/flowFvPatchScalarField.o] Error 1

对应173行的代码为：

void Foam::flowFvPatchScalarField::updateCoeffs()
{
    const volScalarField& C =
        db().lookupObject<volScalarField>(C_);

    gradient_ =5;

    operator==
    (
        this->patchInternalField()
        + gradient_/this->patch().deltaCoeffs
    );
}

    fixedValueFvPatchScalarField::updateCoeffs();
}

这边参考网上陈丽萍老师的教程，但是编译总是出错，是不是版本不支持了？我的是5.0版本

最近需要计算一个壁面传热传质的模型，结果发现fluent中的壁面边界条件在组分输运上只有两个选项，一个是质量分数，另一个是零梯度。
所以计划利用openfoam编写一个组分或者热量运输通量的边界条件，参考了网上的一个相关教程（https://wenku.baidu.com/view/67aeca451fd9ad51f01dc281e53a580216fc50ea.html）
但是在创建边界的过程中总是报错。这种边界有人建立过吗？未标题-1.jpg

好的，谢谢

有一个问题，有限元直接就把N-S方程变成代数方程了吗？
利用有限元方法，对不可压缩流体处理过程，有没有像SIMPLE这样的方法？

@东岳 谢谢东岳老师

fluent中有fan，porous jump等中间面的边界，但是openfoam中应该怎么处理这种边界呀？

如图（二维），如果一个管道中有一个风扇，可以给中间那条线的两边指定一个压力增量delt_P，用来模拟风机作用下管道流场吗？