Learning Forum

[sharm2a2]

Hello everyone,

What is the difference between pseudo transient simulation and transient simulation?

When to use pseudo transient ? I know about the transient simulation but pseudo is bit confusing. If we want to run pseudo we have to run as a steady which confuses me as since it is steady state than why transient in it.

Please help. 

 

Thanks

[Keyur Kanade]

Hi, 

Pseudo transient  is a form of implicit under-relaxation for steady-state cases. It helps in stabilizing the case and at the same time gives faster convergence. Please see help manual for more information. 

Regards,

Keyur

[Keyur Kanade]

Moving to fluid dynamics category. 

Regards,

Keyur

[seeta gunti]

Given more information from the document. 

 

For the set up,  you can go through  our user guide section 28.13.

 

Regards,

Seeta

[denispansolin]

Hi guys,

I am doing a simulation with Turbulent and compressible Hydrogen (Internal Flow) in 3-Dimensions.  I m doing it using Pseudo Transient Time. My residual after 200 iterations becomes flat. Is that normal? When I run it steady state ( no Pseudo Transient) the iterations go up and down forever. Can someone explain to me why in pseudo transient they become flat so soon?? 

Thank you for your help !!!!