MPPICInterFOAM 粒子大小对导致计算失败

qingdong_wang

当我把manualinjection所使用的size distribution设置成 1e-3的时候就出现计算失误
Cloud: kinematicCloud injector: model1
Added 205 new parcels

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigFpe::sigHandler(int) at ??:?
#2  ? in "/lib64/libc.so.6"
#3  Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
#4  Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
#5  Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#6  Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
#7  Foam::fvMatrix<double>::solve() at ??:?
#8  Foam::PackingModels::Implicit<Foam::MPPICCloud<Foam::KinematicCloud<Foam::Cloud<Foam::MPPICParcel<Foam::KinematicParcel<Foam::particle> > > > > >::cacheFields(bool) at ??:?
#9  ? at ??:?
#10  ? at ??:?
#11  ? at ??:?
#12  ? at ??:?
#13  __libc_start_main in "/lib64/libc.so.6"
#14  ? at ??:?
Floating point exception

当我改成比如说8e-4的时候, 计算就没有问题, 能够正常进行. 我觉得是不是因为粒子之间有重叠的关系? 后来我使用scipy中的KDTree将有重叠的粒子删掉, 但是删掉以后发现还是出现错误, 甚至只有七个粒子的时候, 计算还是不能进行. 而且我肉眼观察, 粒子之间间隔已经比较远了, 而且距离边界也有一定的距离. 所以我想问一下, 有遇到这种情况的吗? 会是什么原因造成的呢?

东岳

粒子太大了。要小于网格。

qingdong_wang

yes, actually, i also thought that. but is there such strict criterion? The mesh size of my case is 0.000166667, namely 1.6e-4 m. However, when i set the diameter of particle as 5e-4 even 8e-4 m, it also works?

东岳

Double check if the lagrangian particle is two-way coupled with the fluid phase. If it is one-way coupled, the restriction can be abandoned.