[sunliming]

Two problems found when using pimpleDyMFoam and waveDisplacement：

1. When I use pimpleDyMFoam together with cyclic boundary conditions,(actually I use waveDisplacement, you can try the movingCylinder case, with a pair of cyclic boundaries and oscillatingVelocity for the cylinder, the same thing happens) parallel running cracks: after about 2 or 3 timeSteps, running stopped with the message " face o area does not match neighbour by 0.0195% --possible face ordering problem", no matter what kind of decomposition method I use, the same problem always appears. But when I use a single core to run it, no such problem happens. So I assume there might be some bugs in parallel running of dynamic mesh cases with cyclic BCs. Has anyone encountered this before? If anyone is interested, just let me know, I can post the tutorial.

2. When I use waveDisplacement to simulate a imposed wave motion of the bottom surface, something even more strange happens: if I stop the running, and resume it, it just explodes with the error "Floating point exception (core dumped)"! This is serious cause I cannot assure the running keeps going until I get satisfactory results. Once it stops, it cannot be resumed! Again, if anyone is interested, I can post the tutorial.