I've created a simple fluid simulation that I saved to disk as a .sim.sc sequence.

My question is how do I use this cache to save out as a HDA or even to show up in my mantra render? I see it playing back in my viewport as particles but when I render I don't see it. I'm assuming I have to somehow convert the cache to geometry or something but I'm pretty lost.

I'm eventually going to be needing to save it out as either an alembic or HDA to import into C4D.

Check out the Hallway Flood tutorial. It covers how to prepare fluid in a step-by-step process.
https://www.youtube.com/watch?v=iYQpZCxZrcA [youtube.com]

Thanks for the tip, I will check it out!