Excellent! Notice that the seperation bubble at the exit reattaches to the wall and thus we are much more confident in our solution here.
What I meant by adjusting the properties of a single phase flow is just changing the properties of water to account for the Al nanoparticles. I would direct your attention to the article: Assessment of Single Phase Model of a Nanofluid for Numerical Prediction of Forced Convection Heat Transfer, Journal of Nanofluids 2016. https://doi.org/10.1166/jon.2016.1199Â There are likely many other studies that have done something similar. You have done well by adding complexity to your model in small steps. This might be one more small step to take before moving to the two-phase solution. You would have to also determine if the parameters are appropriate for your case.
You are making good progress. Congrats!!!