Nut Flush Draw and Overcards

[mojobluesman]

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I'd 3bet preflop and raise the flop. I'd probably call the river since unless button also has a heart draw he's probably going to overcall one but not two and if we get 3bet we're in trouble.

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What does raising on the flop accomplish?

I really don't have a hand to protect. By raising I might knock out a weaker Ace or Queen that would call me down if I spiked either and I'm also knocking out players I would like to have involved if I spiked the flush.

Is the problem with the river raise that there's no upside to it?

I don't really understand the thinking there.