Fluent solver slows down with time
Hello ANSYS community,
I've a problem with my fluent solver slowing down with an increasing number of iterations. I'm simulating a transient case of a vertical-axis-wind-turbine on my home computer, which has a Intel Xeon E3-1231 and 16gb RAM and ANSYS 19.1 (free student version) installed on a hard drive.
While this setup is probalby not ideal, the simulation starts fast with multiple iterations solved per second, but with increasing number of iterations the simulation then slows down. Last time I checked (around 10000 iterations in total), one iteration took up to 10 seconds to solve. My best guess is an issue with the memory (maybe?) but the task-manager actually shows that plenty of RAM should be available.
A work-around is stopping the simulation halfway through and restarting ANSYS, then it runs fast again. Sadly this is pretty time-consuming since FLUENT is, once the iterations slowed down, very "sensitive" to button-pressing i.e. freezes for a few seconds/responds slowly to commands. I hope someone has a fix for my (sometimes) lazy Fluent