Stl file problem in voxelization

Hi my friends
I want to simulate an external flow around the cylinder obstacle which is located at the bottom of the domain. dx is equal to 10 and height of this obstacle is 20 and I determine 10 for its cz. But when I analyzed the outputs, I found out that part of this obstacle is removed.
does anybody have idea about this issue?

Hi Navidsamiei,
I had a similar problem, when the geometry faces are situated on cuboid fronteers. For an obstacle located at the bottom, I thus position the obstacle a bit higher than the bottom (one or two mesh nodes). Technically, the object is in levitation but with only one node between the object and the bottom, there is no place for the fluid to flow.
Hope it helps.

Thank you very much for answering.