I am simulating Heat Exchanger. I have tried and tested all the methods to resolve this issue from the internet like refining mesh, improving skewness and orthogonal quality ,extending outlet to further downstream, adjust relaxation factors, adapt iso-value, avoid sharp edges for to abstain from discontinuity, but still encountering reverse flow.

Now what I think is that reverse flow is due to the fact that pressure at the outlet is 1atm which is our outlet boundary condition and it seems pressure somewhere inside domain is lesser due to which flow is trying to re-enter the domain since we know Flow of a fluid is from high pressure to low pressure. so for its remedy i should decrease the outlet pressure from 1 atm to a lit bit lower to encounter the reverse flow? would this technique work?

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