Yes.
At the end of every epoch, your emissions rewards for that epoch are automatically added to the staked pool within the relevant validator component.
This means that any Liquid Stake Units (LSUs) that you hold will, after each epoch, have a slightly larger pool of XRD that they can claim.
Your rewards, therefore, compound approximately every 5 minutes (the approximate length of an epoch).
If you prefer to use your new XRD emissions for something other than staking to the same node, you simply need to unstake the quantity you want to use.
Further reading:
- How to Stake and Unstake XRD
- How do XRD emissions work?
- How XRD staking emissions rewards are calculated - general
- How XRD staking emissions rewards are calculated - for token holders
- How do token holders earn and claim XRD emissions rewards
- How long is an epoch on Radix?
- What's the difference between Proof of Stake (PoS) and Delegated Proof of Stake (DPoS)?