# Cylinder sand column

**URL:** <https://community.freefem.org/t/cylinder-sand-column/1346>\
**Category:** General Discussion\
**Created:** [November 23, 2021, 6:37am UTC](https://community.freefem.org/t/cylinder-sand-column/1346 "2021-11-23T06:37:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![xiaojiemo](https://avatars.discourse-cdn.com/v4/letter/x/a4c791/32.png) [@xiaojiemo](https://community.freefem.org/u/xiaojiemo)\
**Post date:** [November 23, 2021, 6:37am UTC](https://community.freefem.org/t/cylinder-sand-column/1346/1 "2021-11-23T06:37:05Z")

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hello,everyone,  
I am writing mesh code which is a column which is consisted of sand particle and water. I have finished the cylinder,which I still don’t have idea on how to generate the particles. maybe forming thounsands of sphere?  
who cam give me some suggestions?  
best regards