Removal of solid in a pipe
 

Greetings.

I would like to ask for your assistance on the removal of a solid trapped in a modelled pipe (let's say 1m) containing liquid flow. A vacuum tube is placed near the solid to suck out the solid. The solution converges but the solid doesn't seem to move. I am using VOF model, any idea what might gone wrong? I tried applying ridiculous pressure yet to no avail. Appreciate the help.

Thank you.