@韬智tz 谢谢

在一个可压缩热喷流模拟中需要修改k-epsilon模型 引入温差和可压缩性的影响，需要用到温度、可压缩性等，请问怎么在原k-epsilon模型类里使用这些量微信图片_20220322153039.png
原模型Cmu是个常数 修改后应该是一个场量
具体一点的问题就是thermo.gamma()怎么接入湍流模型这个类里呢

乍一看，三年过去了

http://dyfluid.com/buoyantSimpleFoam.html

在真正开始pimple循环后，EEqn.H末尾有一个thermo.correct()。这一步根据计算后的能量场，更新了温度、粘度、可压缩比（psi）等等物性，所以在pEqn.H的开头，出现了一步rho = thermo.rho()，实际上进行了更新密度的操作（rho = psi * p，注意这个时候psi已经变了），之后再进行压力的求解。

最近更新了这个，尤其是关于两个密度更新的问题的讨论。不可压缩流速度修正与压力变量直接相关。但是附加浮力之后，速度修正与压力变量以及密度变量（浮力）直接相关。我赞同上面的理解。同时，能量方程之后的密度更新可有可无，只不过是收敛性的问题。

使用snappyHexMesh画网格，利用检查网格显示一个地方错误，有扭曲的曲面微信图片_20220321211715.jpg
但是打开paraview没有看到明显的错误，这应该从什么方面去检查模型？

@thegame 我看之前老师回答我的是要用splitMeshRegions命令将网格分开，请问你知道toposet命令的具体操作吗？我才接触这个openfoam，不是很熟练。

@一颗鸭蛋

尝试过docker 没弄明白 当时M1还没适配docker 后来也懒得弄了
我是用parallel 装的ubuntu arm 自己编译的，跑的起来完全没问题。
跑分里面的M1 就是我的mini

@tens 哦哦，这就说得过去了，看起来这个应该是用来定义辐射换热计算边界条件的一个引入参数，看输入像是隐式计算辐射换热量和显式计算辐射换热量的区别

Openfoam extend 4.0可以使用DensityBasedTurbo吗？

@tens 明白了，十分感谢！

@疏影横斜水清浅
谢谢回复，是的，预计和你问题一样的，我正在重新检查代码，编译器不报错的话，只能一行行自己排查吗？

各位好
仿照kinematiccloud中的函数Dij，写了一个新的函数Sum，用来计算当前时间步流场中所有粒子的某个属性之和（如直径之和）。
那么如果我想用DPMFoam求解器，并且想在最终的结果文件中将新添加的函数Sum的计算结果输出出来，应该怎么做呢？
这个函数输出的值应该算作粒子属性还是场的属性呢？
谢谢各位！

@星星星星晴 老师我最近开始做本科毕设了，非常感谢您的帮助和耐心讲解。后面可能还有知识要请教您，万分感谢！

@星星星星晴 谢谢老师的耐心讲解！:xinxin:

@星星星星晴 好的，感谢您的指点！

@xpqiu

PATH=/usr/lib64/openmpi/bin:/home/xry/OpenFOAM/xry-2112/platforms/linux64GccDPInt32Opt/bin:/usr/lib/openfoam/openfoam2112/site/2112/platforms/linux64GccDPInt32Opt/bin:/usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/bin:/usr/lib/openfoam/openfoam2112/bin:/usr/java/jre1.8.0_151/bin:/opt/tsce4/maui/sbin:/opt/tsce4/maui/bin:/opt/tsce4/torque6/bin:/opt/tsce4/torque6/sbin:/usr/local/bin:/opt/software/openmpi/bin:/usr/mpich/bin:/usr/bin:/usr/local/sbin:/usr/sbin:.:/home/xry/.local/bin:/home/xry/bin LD_LIBRARY_PATH=/home/xry/OpenFOAM/xry-2112/platforms/linux64GccDPInt32Opt/lib:/usr/lib/openfoam/openfoam2112/site/2112/platforms/linux64GccDPInt32Opt/lib:/usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/sys-openmpi:/usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib:/usr/lib/openfoam/openfoam2112/ThirdParty/platforms/linux64GccDPInt32/lib/sys-openmpi:/usr/lib/openfoam/openfoam2112/ThirdParty/platforms/linux64GccDPInt32/lib:/usr/lib64/openmpi/lib:/usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/dummy:/opt/software/openmpi/lib:/software/openmpi/lib:/usr/mpich/lib:/usr/local/mpc/lib:/usr/local/gmp/lib:/usr/local/mpfr-4.1.0/lib linux-vdso.so.1 => (0x00007ffce15f4000) libfiniteVolume.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libfiniteVolume.so (0x00007faff29f9000) libfvOptions.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libfvOptions.so (0x00007faff2583000) libmeshTools.so => 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libincompressibleTurbulenceModels.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libincompressibleTurbulenceModels.so (0x00007faff02a7000) libwaveModels.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libwaveModels.so (0x00007fafeffd5000) libVoFphaseTurbulentTransportModels.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libVoFphaseTurbulentTransportModels.so (0x00007fafefc15000) libincompressibleInterPhaseTransportModels.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libincompressibleInterPhaseTransportModels.so (0x00007fafefa12000) libOpenFOAM.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libOpenFOAM.so (0x00007fafeeca9000) libdl.so.2 => /lib64/libdl.so.2 (0x00007fafeeaa5000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fafee79d000) libm.so.6 => /lib64/libm.so.6 (0x00007fafee49b000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fafee285000) libpthread.so.0 => 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/usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libdynamicMesh.so (0x00007fafebbc5000) liblagrangian.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/liblagrangian.so (0x00007fafeb980000) libtwoPhaseMixture.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libtwoPhaseMixture.so (0x00007fafeb766000) libtwoPhaseProperties.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libtwoPhaseProperties.so (0x00007fafeb519000) libspecie.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libspecie.so (0x00007fafeaea1000) libz.so.1 => /lib64/libz.so.1 (0x00007fafeac8b000) /lib64/ld-linux-x86-64.so.2 (0x00007faff511c000) libmpi.so.12 => /usr/lib64/openmpi/lib/libmpi.so.12 (0x00007fafea9a7000) libcompressibleTransportModels.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libcompressibleTransportModels.so (0x00007fafea7a3000) libthermophysicalProperties.so => 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libSLGThermo.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libSLGThermo.so (0x00007fafe80b2000) libdistributed.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libdistributed.so (0x00007fafe7e37000) libblockMesh.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libblockMesh.so (0x00007fafe7b93000) libnuma.so.1 => /lib64/libnuma.so.1 (0x00007fafe7987000) libltdl.so.7 => /lib64/libltdl.so.7 (0x00007fafe777d000) libdecompositionMethods.so => /usr/lib/openfoam/openfoam2112/platforms/linux64GccDPInt32Opt/lib/libdecompositionMethods.so (0x00007fafe74ec000)

@星星星星晴 非常感谢！

@bestucan 在 请问如何理解这一项？ 中说：

我猜是任意方向的加速度。

速度本身是矢量，做梯度就是个二阶张量了，前后乘以n和n的转置，应该是类似于对角化操作（基于某方向的对角化）。把各方向的加速度解耦出来，使之不在其他方向有分量。

这个“任意方向”就是右边那项分母上n的方向，咦，n就是法向哈:chouchou:

那应该就是了

但是要注意右边那项分子，速度有下标的，应该是n方向上的速度。
那这一项的意义应该是：“n方向上的速度，在n方向的加速度”

这也和左边对角化操作印证，嗯，就这么猜:xiezuoye:

理解了，这项应该是一个标量，即“沿自由表面法向的加速度”。

我水平有限，还是需要多研究。

非常感谢您的不吝赐教！

刚听说open foam被esi收购了？

@李东岳 谢谢李老师

@xpqiu 牛，谢谢老兄，:146: