What does this error report mean

[zxss]

Dear all,

I am now updating my 2D navier stokes equation with moving boundary to 3D, here is the code
Parallel_3d_NS_moving.edp (4.4 KB)
Th.mesh (734.3 KB).
However, I meet a error report when I run it for some time as

I don’t know what does it mean. Does anyone encounter similar error and know why it occurs?

[zxss]

What’s more, I find a interesting result when I use “-pc_type hypre”

when it doesn’t converge fistly time, it can calculate again automatically. What is the mechanism behind?

[aszaboa]

I do not know the the exact issue, but I am not sure you can use convect when running FreeFEM with PETSc in parallel. Maybe looking at the solution can also provide the insight.

[zxss]

Yes, after reading this post Convect( ) in parallel - #2 by prj. I know that using ‘convect’ inside a ‘varf’ will generate wrong results for high timesteps. But it seems work at small time step as this post Convect( ) in parallel - #6 by mojtaba.barzegari shows. Anyway, I will change ‘convect’ in ‘varf’ with ‘convectParallel’ to see what will happen.
Many thanks for your reply.