渦巻き【うずまき】
whirlpool, maelstrom, vortex, eddy, swirl, spiral (shape, pattern)
渦中【かちゅう】
vortex, maelstrom, whirlpool, (in the middle of a) scandal, controversy, quarrel, turmoil
渦巻く【うずまく】
to whirl, to eddy, to swirl, to curl (smoke), to be all jumbled together (feelings, thoughts, etc.), to surge, to sweep