Learning Forum

[nobrien]

Hello!

I'm using Fluent 2021R2, and I am trying to change the under-relaxation factors for the different equations with the Pseudo-Transient method. Through the graphical interface, I can change momentum, pressure, k, omega, body forces, density, and Turbulent viscosity. While that could work, I'd like to control these factors from a text-command so I can run them on an HPC without setting up the case in a GUI.

The text command for changing the pseudo-transient relaxation factors is in /solve/set/pseudo-relaxation-factor, but this text command does not let me change the factors for momentum or pressure equations. Is there a text command that I am missing? I couldn't find it in the text command guide or just by snooping around the text-command menus. Would I instead need to use a scheme command to set it manually?

[Rob]

/solve/set/under-relaxation perhaps? 

[nobrien]

Hmm I'm not seeing that option. Here is what I'm seeing: 

Maybe I can look in another menu for the under-relaxation option, but it looks like "relaxation method", "high-order-term-relaxation", and "pseudo-relaxation" all lack the option to change the pressure-momentum relaxation factors...

This is the page showing the factors in the GUI, but I would prefer to change the relaxation factors through a text command.

[Rob]

I'd missed that you were using an older build, it's there in 24R2. Some of the options have changed so it's possible the UR factors weren't fully exposed for pseudo-transient at 21Rx. 

[nobrien]

Ah, no worries. I figured that may have been the case.

Thanks, Rob!