1
general::
Phrase(s): go with the flow [and] go with it
Inf. to cope with adversity; to accept one’s lot. • No, just relax and go with the flow. • Go with it. Don’t fight it.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, go with the tide. Move along with the prevailing forces, accept the prevailing trend, as in Rather than striking out in new directions, I tend to go with the flow, or Pat isn't particularly original; she just goes with the tide. The flow in the first and more colloquial term, which dates from the late 1900s, alludes to the ebb and flow of tides and probably gained currency because of its appealing rhyme.
American Heritage Idioms