新手求问冲击波管喷出的低马赫数supersonic的边界条件问题

李东岳

密度好像是根据粘度和初始压力等算出来的

是的，超音速边界条件理论上需要给压力、速度、和温度的边界条件，密度从其中算出来。这是稳定的边界条件

0_1511164194583_捕获.JPG

在代码上：

volScalarField rho
    (
        IOobject
        (
            "rho",
            runTime.timeName(),
            mesh
        ),
        thermo.rho()
    );

所以我觉得你应该通过thermo.rho()函数来给定密度因为rho不是读取出来的。

Ryo

@李东岳在新手求问冲击波管喷出的低马赫数supersonic的边界条件问题中说：

volScalar

感谢回复

这个代码的意思是修改求解器重新建立一个可单独计算密度的场吗，如果是的话还需不需要在ControlDic里加rho function。

然后代码是不是要放在 applications/solvers/compressible/sonicFoam/createFields.H里面？不知道是不是我用的Mac系统，找了一下午找不到createFields.H这个文件。。applications文件夹也没有找到。这些文件是不是隐藏在docker里面，怎么打开这些隐藏文件？
麻烦老师了🙏

Ryo

Ryo

@李东岳
李老师，现在发现openfoam Mac版的applications文件夹好像只存在于docker模拟的虚拟机里面在Mac上找不到。

用vim在docker状态下找到createfields.H文件了，用vim打开后发现里面已经有一个rho的场存在，代码和您写的是一样的。
是不是要像速度场那样加上IOobject::MUST_READ,IObject::AUTO_WRITE这些代码才行，现在还没有完全理解这些代码的含义。比如 "Reading field U\n" << endl里面的这个n和endl是什么意思。。网上找了很久也没有发现答案。希望老师能解答一下🙏

0_1511493306834_屏幕快照 2017-11-24 12.10.28.jpg

李东岳

\n和endl的意思是换行。

加上IOobject::MUST_READ,IObject::AUTO_WRITE这些代码才行

对，你加上AUTO_WRITE就会自动写了，然后重新编译一下。

研究目的是观察冲击波密度场变化，于是在controldict里加上了密度function，

不是很理解你的这句话哈 :confused:

Ryo

@李东岳
感谢回复🙏

现在所在的这个研究室在做用独创的激光CT法观测从冲击波管里面喷出的冲击波密度场。所以我现在想用OpenFOAM作为CFD工具模拟出冲击波的密度场，然后再和真实实验中的图像数据做对比。
sonicfoam里面计算出的结果没发显示密度，在网上找了个代表密度函数的代码放到controldict里面后可以显示密度了但是不能直接在0文件夹里面调节初始密度场。
这是放在controlDict里面的代码
0_1511771945812_屏幕快照 2017-11-27 17.14.32.png

现在把Oobject::MUST_READ,IObject::AUTO_WRITE加到createFields.H里面后，计算时仍然不读取0文件夹里面的密度边界条件和初始密度场。。
0_1511772192335_屏幕快照 2017-11-27 16.24.51.jpg

想问还需要编译什么才能直接调节初始场的密度。
麻烦老师啦🙏

Ryo

@李东岳李老师，现在想重新编译时按照http://openfoamwiki.net/index.php/How_to_add_temperature_to_icoFoam。这个教程想练一遍，发现wmake的时候出现错误

/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::STARCDCore::STARCDCore()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::fileName const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::STARCDCore::starFileName(Foam::fileName const&, Foam::fileFormats::STARCDCore::fileExt)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `typeinfo for Foam::OBJstream'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::vtk::legacy::contentNames'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::reduce(Foam::Vector2D<double>&, Foam::sumOp<Foam::Vector2D<double> > const&, int, int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::OBJstream::~OBJstream()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::freePstreamCommunicator(int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::geometricSurfacePatch::geometricSurfacePatch(Foam::word const&, int, Foam::word const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::UPstream::finishedRequest(int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::scalePoints(double)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::xferPoints()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::DimensionedField<double, Foam::triSurfacePointGeoMesh>::typeName'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::STARCDCore::writePoints(Foam::Ostream&, Foam::Field<Foam::Vector<double> > const&, double)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::xferFaces()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::OBJstream::write(Foam::Vector<double> const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::NASCore::parseNASCoord(Foam::string const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::fileName const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::STARCDCore::writeHeader(Foam::Ostream&, Foam::fileFormats::STARCDCore::fileHeader)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::abort()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::vtk::legacy::fileHeader(Foam::vtk::formatter&, std::string const&, std::string const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::DimensionedField<double, Foam::triSurfaceGeoMesh>::typeName'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::subsetMesh(Foam::List<bool> const&, Foam::List<int>&, Foam::List<int>&) const'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::OBJstream::write(Foam::face const&, Foam::UList<Foam::Vector<double> > const&, bool)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::vtk::outputOptions::legacy(bool)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::canRead(Foam::fileName const&, bool)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::STARCDCore::readPoints(Foam::IFstream&, Foam::Field<Foam::Vector<double> >&, Foam::List<int>&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::resetRequests(int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::allocatePstreamCommunicator(int, int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::edgeOwner() const'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::OBJstream::OBJstream(Foam::fileName const&, Foam::IOstream::streamFormat, Foam::IOstream::versionNumber, Foam::IOstream::compressionType)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::OBJstream::write(Foam::UList<Foam::face> const&, Foam::Field<Foam::Vector<double> > const&, bool)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::List<Foam::labelledTri> const&, Foam::List<Foam::geometricSurfacePatch> const&, Foam::Field<Foam::Vector<double> > const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::init(int&, char**&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::geometricSurfacePatch::geometricSurfacePatch()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::UPstream::allToAll(Foam::UList<int> const&, Foam::UList<int>&, int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::STARCDCore::readHeader(Foam::IFstream&, Foam::fileFormats::STARCDCore::fileHeader)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::UIPstream::UIPstream(int, Foam::PstreamBuffers&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::~triSurface()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UIPstream::UIPstream(Foam::UPstream::commsTypes, int, Foam::DynamicList<char, 0u, 2u, 1u>&, int&, int, int, bool, Foam::IOstream::streamFormat, Foam::IOstream::versionNumber)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::sumReduce(double&, int&, int, int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::reduce(double&, Foam::minOp<double> const&, int, int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::operator=(Foam::triSurface const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `typeinfo for Foam::vtk::formatter'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::sortedEdgeFaces() const'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::vtk::legacy::dataTypeNames'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::coordSet::coordSet(Foam::word const&, Foam::word const&, Foam::List<Foam::Vector<double> > const&, Foam::List<double> const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::List<Foam::labelledTri> const&, Foam::Field<Foam::Vector<double> > const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::triSurface const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::List<Foam::labelledTri>&, Foam::List<Foam::geometricSurfacePatch> const&, Foam::Field<Foam::Vector<double> >&, bool)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::addValidParOptions(Foam::HashTable<Foam::string, Foam::word, Foam::string::hash>&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `Foam::UPstream::exit(int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::vtk::newFormatter(std::ostream&, Foam::vtk::formatType, unsigned int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::vtkUnstructuredReader::vtkUnstructuredReader(Foam::objectRegistry const&, Foam::ISstream&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::operator==(Foam::geometricSurfacePatch const&, Foam::geometricSurfacePatch const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::~triSurface()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so: undefined reference to `Foam::UPstream::waitRequest(int)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::OBJstream::write(Foam::UList<Foam::edge> const&, Foam::UList<Foam::Vector<double> > const&, bool)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::write(Foam::fileName const&, bool) const'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `typeinfo for Foam::triSurface'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::movePoints(Foam::Field<Foam::Vector<double> > const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::DimensionedField<int, Foam::triSurfaceGeoMesh>::typeName'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::triSurface(Foam::triSurface const&)'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::markZones(Foam::List<bool> const&, Foam::List<int>&) const'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::fileFormats::NASCore::NASCore()'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::writeStats(Foam::Ostream&) const'
/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/lib/libmeshTools.so: undefined reference to `Foam::triSurface::clearOut()'
collect2: error: ld returned 1 exit status
make: *** [/opt/OpenFOAM/OpenFOAM-v1706/platforms/linux64GccDPInt32Opt/bin/my_icoFoam] Error 1
sh-4.2#

我在想是不是用mac的原因于是我又在虚拟机上（linux mint）上试了下，直接告诉我wmke command can not found
。。不知道时怎搞的了。。能帮忙看下哪里出错了吗。
🙏

Ryo

@ryo 不是wmke是 wmake，刚才手误

李东岳

在你的Make/option里面添加

//EXE_INC = \下面加
-I$(LIB_SRC)/meshTools/lnInclude \

//EXE_LIBS = \下面加
-lmeshTools \

试试

Ryo

@李东岳谢谢回复。🙏
Make/option里面本来就有这些码。 0_1512725181546_屏幕快照 2017-12-08 18.23.08.png

李东岳

不好意思没有mac不能提供建设性意见 :big_mouth:

Ryo

@李东岳感谢老师回复 🙏

Mac上还是没有找到什么原因wmake出错，但是在虚拟机（Linux Mint）上在按照openfoam wiki上添加温度的教程编译成功了。
发现在createfields.H里加Oobject::MUST_READ,IObject::AUTO_WRITE，和在/systym/controlDict里面加
0_1513060706790_屏幕快照 2017-12-12 15.37.48.png
效果一样都只是根据初始p，U，粘度等来计算密度，不能直接读取0文件夹里面的rho文件。。。
这是0文件夹里面的rho文件虽然设置的是1但是计算后在paraview上显示是0.23
0_1513060816206_屏幕快照 2017-12-12 15.31.18.png
怎么才能跟fluent一样直接调节初始场密度呢。
麻烦老师在看下🙏

Ryo

@李东岳
老师好！发现openfoam是不能直接进入密度场的因为openfoam用的是kinematic viscasity.fluent用的是动力粘度。
0_1513326954486_屏幕快照 2017-12-14 16.26.35.png
所以感觉还是得调节p，之前的压力边界条件我设置的是outlet为0.2大气压，inlet为zerogradient。现在调换后inlet为0.2大气压，outlet为zerogradient，initial为1个大气压。然后按照
0_1513327734658_屏幕快照 2017-12-15 17.46.38.png
更改fvscheme后达到预期的冲击波外的区域密度场都1左右，但是发现冲击波前面的涡很微弱。
这是实验得到的图像。冲击波前面有很明显的蓝色的涡。
0_1513328028553_屏幕快照 2017-11-20 13.59.32.png
这是openfoam得到的图像，冲击波前面基本没有涡
0_1513328098516_屏幕快照 2017-12-15 17.52.52.png

李东岳

volScalarField rho
    (
        IOobject
        (
            "rho",
            runTime.timeName(),
            mesh
        ),
        thermo.rho()
    );

OpenFOAM里面的密度是通过thermo.rho()更新的，因此你不能直接给密度。

更改fvscheme后达到预期的冲击波外的区域密度场都1左右，但是发现冲击波前面的涡很微弱。这是实验得到的图像。冲击波前面有很明显的蓝色的涡。

云图看起来不是很客观，最好出plot图看看

Ryo

@东岳 Hi!
又要来麻烦老师了🙏

之前的涡的存在问题已经解决。原因是因为压力边界条件设置问题，还有发现k和epsilon之前按照公式算的是10的5次方级别的数字但是我把他调节成0.5也能算而且精度更准，这个还不知道什么原因。。

现在（其实从之前）就有个关于paraview的问题，把data放到paraview里面显示rho跑第一遍的colour legend和先显示p跑一遍在切换到rho显示的colour legend有些许的不同。

这是显示rho跑第一遍的图 colour legend只显示到0.23
0_1542768671839_屏幕快照 2018-11-21 11.46.20.png

这是先跑完一遍p在切换到rho， colour legend就可以显示到0.06
0_1542768794615_屏幕快照 2018-11-21 11.46.33.png

求老师给点指示

李东岳

什么是“先跑一遍rho和先跑完一遍p”...

Ryo

@东岳
sorry 😂
先跑一遍rho：把data放到paraview里面选择rho然后点击play
0_1542872176845_屏幕快照 2018-11-22 16.10.30.png

先跑一遍p在调节到rho：把data放到paraview里面先选择p然后点击play在从p调节到rho
0_1542872217819_屏幕快照 2018-11-22 16.09.03.png

想说的意思可能就是第一遍play显示的数据图像和play完第一遍后切换到其他性质（比如从密度切换到压强，压强切换到密度）后在切换回来显示的不一样。一样的data为什么会显示的不一样呢？问题解释的可能有点傻，请见谅。。

李东岳

0_1542931053530_捕获.JPG

你点击一下这个试试

Ryo

@东岳
懂了，多谢老师。

Ryo

@东岳
又来麻烦老师了。之前用snappyHexMesh做的网格感觉不好现在想换用icem cfd来做，弄了好几天发现喷口旁边座位阻碍物的圆柱的网格有大瑕疵（表面的都很好），找了很多视频里面都没有找到该怎么去掉圆柱里面这些不需要的网格。
另外icem cfd做好的网格怎么导入openfoam和paraview现在也没找出来方法。请老师给点指示。
0_1543480873745_Inked捕获_LI飞.jpg

🙏🙏

Regina

@ryo 不太明白为什么动力粘度就不需要单独设置密度了呢，那如果我需要设置成水的属性，密度为1000kg/m^3，运动粘性系数=1.139×10^-6Pa*s。除了修改属性设置文件transportProperties中的粘度，我怎么保证密度也是我想要的1000kg/m^3呢？希望能指导一二，跪谢

CFD中文网

新手求问冲击波管喷出的低马赫数supersonic的 边界条件问题

新手求问冲击波管喷出的低马赫数supersonic的边界条件问题