Is the Residual acceptable?

Boon Ping , Oh

I'm currently doing two simulations. One of the Residual diverges in the beginning for around 100 iterations. Though it converges eventually till 0.001. Is it fine and acceptable? Another one diverges abit in the beginning and have zick zacks when the residual stays 0.001. I've checked the Cell Quality, whether I#m using the right Condition, checked the Wall Y+ and it's all fine. Are both the Simulations not acceptable? Are those Simulations, which Residuals have zick zacks of diverge few times but eventually converge acceptable?