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laminar/ turbulent flow in the same simulation

Question asked by Ali Moslemi on Feb 26, 2019

I am simulating fluid flow in pipe geometry which ends to a nozzle through a converging geometry. The fluid is water and the flow is laminar in the pipe section but it becomes turbulent (Re>2500) in the nozzle section. I need an accurate modeling since I want to compare my results to experimental data. Which turbulence model should I use? Does laminar/turbulent modeling work for my case? If so, how does it recognize the turbulence from laminar flow?