Learning Forum

[Saeed]

Hello,

 

I have a question regarding the relaxation factor in fluent. I noticed that there is high order term relaxation in fluent/solution/method and there are relaxation factors also in fluent/solution/ Control . I wanted to know what is the difference between these two ?

 

Thanks 

[SRP]

 

Hi,

Under-Relaxation Factors contains the under-relaxation factors for all equations that are being solved with the pressure-based solver

High order relaxation enables the relaxation of high order terms to aid in the solution behavior of flow simulations when higher order spatial discretization is used.

 

[Rob]

And to add both are explained in the Solver section(s) of the manuals. 

[Saeed]

thank you for your reply.

unfortunately, I have an academic account and do not have access to them. i know that they should be decreased slighltly and need to be below 1. i would really appreciate it if you can explain how i can use both at the same time. 

Thanks 

[Rob]

If you click on Help in Fluent you'll get straight to the User's Guide. 

[Saeed]

Thank you for your help,

I just have one more question, I know that for under relaxation factors , changing them to a lower value it needs less iterations but takes more time. I want know if the same thing happens for high order term relaxation ?

[Rob]

More iterations if you decrease the value. HOTR blends the discretisation scheme so may take more time but iterations required should be unaffected.