Yongchuan YU

 case 1

 case 2

 I think I found the problem, with the static_confinement, at the first moment, the particles around the cylinder is defined as surface particles, so it will not apply the...

I changed the code to implement transport velocity to all the particles around the cylinder, but it still did not work. 

 I have implemented this time-space method to detect the surface particle; it seems this is not caused by it

I think I also need to add the "SpatialTemporalFreeSurfaceIdentificationStaticConfinement" to the static confinement boundary condition, to complete the function with wall part

 I solved the problem upside. While tracing the position, we need to update the normal of vectors

thank you