@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 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@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:

他可能要根据 1000-1500 确认 1000 没出错，能用:chigua2:

可以写个 bash 脚本，里面依序写上你要进行的任务：

计算 修改controlDict 计算 修改controlDict

可以写个循环，修改 controlDict 可以用 sed，查找 startTime 0， 替换。

@李东岳
好的，我试试。感谢回复:146:

@miss-zhou_dut 哎哟我勒个去 :143:

@李东岳 谢谢李老师😄

@李东岳 请问老师，可以实现计算一定步数后，时间步倒退，重新计算一遍嘛？我想尝试计算1000时间步，然后从第500步计算到1500步，再从第1000步计算到2000步，这样可以实现嘛？

@李东岳 李老师，再请教一个问题，在检查网格的时候，cell zones 和 Number of regions的数目必须一样吗？如果不一样的话，请问代表什么问题？

@callsy 关于这个问题你看东岳老师发的链接，我之前也试过这个链接，有时候能解决，有时候不行，不行的话就得重新画网格，还有就是切换版本，有时候我用2021R1版本会报错，但是用2019R2就没问题

求助各位老师，我试着在sixDoFRigidBodyMotion库中建立一个新的mylinearSpring文件夹（类似于原linearSpring），意图改动其中的锚点anchor的位置。先试着让它z坐标加1，在编译时出错，错误信息如下。

sixDoFRigidBodyMotion/restraints/mylinearSpring/mylinearSpring.C:error: assignment of read-only location ‘((const Foam::sixDoFRigidBodyMotionRestraints::mylinearSpring*)this)->Foam::sixDoFRigidBodyMotionRestraints::mylinearSpring::anchor_.Foam::Vector<Cmpt>::z<double>()’ anchor_.z()=anchor_.z()+1;

提示在给只读位置幅值，是不是意味着在这里anchor是不能变动的量，那要怎样才能改动它呢？

@李东岳 我试了一下，可以的，是我想要的结果。谢谢东岳老师！

@leeck Q562658790

@李东岳 懂了，谢谢李老师

multiphaseEulerfoam，低离散相分数的时候，没问题，离散相增加到0.35，就报错，尝试修改了边界条件、相间作用力模型、离散格式和网格都无果，差别就是跑的时间长短，最终都发散报错如下：

[8] #0 Foam::error::printStack(Foam::Ostream&) at ??:? [8] #1 Foam::sigFpe::sigHandler(int) at ??:? [8] #2 ? in "/lib/x86_64-linux-gnu/libc.so.6" [8] #3 Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) at ??:? [8] #4 Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::operator/<Foam::fvPatchField, Foam::volMesh>(Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/home/zhl/OpenFOAM/OpenFOAM-8/platforms/linux64GccDPInt32Opt/bin/multiphaseEulerFoam" [8] #5 Foam::PhaseCompressibleMomentumTransportModel<Foam::phaseModel>::nu() const at ??:? [8] #6 Foam::RASModels::kEpsilon<Foam::PhaseCompressibleMomentumTransportModel<Foam::phaseModel> >::correct() at ??:? [8] #7 Foam::phaseSystem::correctTurbulence() at ??:? [8] #8 ? in "/home/zhl/OpenFOAM/OpenFOAM-8/platforms/linux64GccDPInt32Opt/bin/multiphaseEulerFoam" [8] #9 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" [8] #10 ?[ubuntu:09382] *** Process received signal *** 或者这样： [8] #0 Foam::error::printStack(Foam::Ostream&) at ??:? [8] #1 Foam::sigFpe::sigHandler(int) at ??:? [8] #2 ? in "/lib/x86_64-linux-gnu/libc.so.6" [8] #3 Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) at ??:? [8] #4 Foam::operator/(Foam::tmp<Foam::Field<double> > const&, Foam::UList<double> const&) at ??:? [8] #5 Foam::PhaseCompressibleMomentumTransportModel<Foam::phaseModel>::nu(int) const at ??:? [8] #6 Foam::epsilonWallFunctionFvPatchScalarField::calculate(Foam::momentumTransportModel const&, Foam::List<double> const&, Foam::fvPatch const&, Foam::Field<double>&, Foam::Field<double>&) at ??:? [8] #7 Foam::epsilonWallFunctionFvPatchScalarField::calculateTurbulenceFields(Foam::momentumTransportModel const&, Foam::Field<double>&, Foam::Field<double>&) at ??:? [8] #8 Foam::epsilonWallFunctionFvPatchScalarField::updateCoeffs() at ??:? [8] #9 Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::Boundary::updateCoeffs() at ??:? [8] #10 Foam::RASModels::kEpsilon<Foam::PhaseCompressibleMomentumTransportModel<Foam::phaseModel> >::correct() at ??:? [8] #11 Foam::phaseSystem::correctTurbulence() at ??:? [8] #12 ? in "/home/zhl/OpenFOAM/OpenFOAM-8/platforms/linux64GccDPInt32Opt/bin/multiphaseEulerFoam" [8] #13 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" [8] #14 ?[ubuntu:07707] *** Process received signal *** 求大神指点一二！

@xpqiu 不是rpm包，是自己编译。

现在不管了，交给运维了，1000块，自己瞎搞，把同事的监测搞没了，被骂了一顿...

@冠竹 在 .h文件中参照nu的形式，把你新加的DT声明一下就好。建议去了解一下C++变量的声明和定义，，