I am comparing simscale with other CFD softwares and i cannot accomplish this simulation. Simple pipe of 8 inches and 30 meters, 17000 kg/h of air at 115ºC (properties looked online). I do not know why but the results end up diverging. Please help
Project: Prueba 4 | SimScale Workbench
Hello fran_jcr_nob,
I noted that the flow velocity is a ~160 m/s which is higher than the suggested limit for incompressible flow which is set to mach 0.3.
In addition I noted that you have adjusted the relaxation factors, what was the reasoning behind this?
I’m test a setup with initial conditions closer to the expected result, so you can take a look at it here
Best regards
Sebastian
Hello Sebastian. Thank you in advance for your answers.
I am not sure what that “relaxation factor” is, i am sure that i didnt adjusted nor it is that way by default.
What does this factor change? How do you adjust this relaxation factor for the new simulation?
Hello Fran,
I see you can find more information on relaxation factors here:
For the new run I just reseted this to default.
Best regards
Sebastian
I am seeing your results for the same simulation I did. In this case the pressure plot follows the same problem. What we can do to solve it?
Hello again Sebastian.
I have been trying other models that might make this simulation easy and faster to solve. In this case we try a 16 inch pipe of 2 meters, with 29000 kg/h of flow at the outlet and a pressure at the inlet of 79330 Pa.
This make the fluid’s speed way lower than the other models but the pressure at the outlet still show a sinusoidal behaviour
As soon as you solve this please let me know cuz is really weird that a simple simulation like this can’t converge
