Optimal Run Time & Understanding

Hi Darren,

Firstly cheers for the help again!

Thanks for the info on how the timestep write control functions. I had a rough idea but this clears it up alot! However does timestep with a length of 1000s mean that every 1s it re-runs the simulation? Or does it simply follow up from the previous calculation till the end of set length? I know that you can control when the data saved through a value in the write interval, but what do the iterations in between do?

I have read about the maximum runtime and reacted accordingly by increasing it. Thanks for the heads up.

I wanted to know about the other write control methods and how to really use them. I’ve looked into the documentations and haven’t really got a sense of how exactly I should use them. For example, how does “Clock Time” and “Run Time” differ? When should I or should I not use them? Also what is a good write control to select for say a nice 10-20 second flow animation that can be captured in ParaView?

Ah yes the transient simulation, I was playing around with that and for my use case I did get a different result that differs from steady state results by about 5%, may I ask how does it differ from steady state flow? Is it simply just the flow type or some underlying numerical change? Isn’t any underlying numerical flow change governed by the preliminary selection of the desired turbulence models? Or if you have some documentation I can read through to get a better understanding of such I would love to read through it!

I have read through a SimScale forum post about “Under relaxation” so I do roughly understand about the numerics governing that.

As per usual thank you for the reply Darren.

Regards,
Barry