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CPU Booster residuals oscillating

cfd enthusiast

Hello Everyone,

I am simulating using the Open solver. When i start a simulation using the results of another simulation that is close to the solution I get really high residulas that also oscillate like this: 

when I use the cpu booster on my grid the residulas oscillate violently like this: (I am using 3 grid levels with  CGI)

when i turn the CPU Booster off:

I don't understand why the residuals behave the way they do here.

My simulations are successful but the convergence isn't reached. The Physical solutions are not too off from reality, however I am worried that my simulation isn't trustworthy because of the reasons above.

What could be the causes that effect?

Thank you!

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