Oxygen is critical to the composting process, that's why turning the pile is essential to maintain aeration channels. Oxygen generally enters from the sides of the pile and exits from the top/center.

If you cut off the oxygen supply it will go anaerobic, which will smell horrible. Similarly, having water accumulate in the bottom will have the same effect, causing anaerobic conditions. 

 I agree with nostr:nprofile1qqsrjxqeute0zwusetrjp9qeadt5aa7q686wsxr8lsjvg73uuh52yjqpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszj8fle. Oxygen is crucial to keep compost from going anaerobic. I put mine up on a pallet to make sure it gets the best airflow possible.

You can also do a Johnson Su Bioreactor which has stovepipes through it vertically to ensure airflow. 

 I agree with those guys.
Mine sits on the ground in a homemade bin with mesh sides.

Just gotta keep the critters out and the O² flowing. 

 What mesh? 

Like this one?

https://image.nostr.build/70d6de5356fca88e7a68b3b75cf96e89f826074053d4c125c387f35d927a4d26.jpg 

 mmmm
maybe too fine
I think mine's 1/4" hardware cloth.

I'd worry over time that would get clogged up with bits of stuff and water would have a hard time getting out.

 

 Maybe I'm wrong but as long as the compost is not soaking wet, there will plenty of oxygen in it. The soil in the ground is half air by volume assuming it is not compacted. It would seem difficult cut off the oxygen to a compost pile...  

 if it is open to the ground, make sure you put wire mesh under it or you’ll get rats making a nice cozy nest in there. I speak from experience.  

 Followed 

 Look up vermiculture if you have rat issues