Learning Forum

[sharm2a2]

Hello everyone,

I am using fluent LES model for my turbulent flow and one thing makes me confused when I was reading the fluent LES theory is the filter width and filtering process. Fluent is defining the filtering function as 

but no where it is mentioned that, what is  ?

The second question is- What is the value of filter width, how the value of filter width is decided? In fluent manual it is only mentioned that y-plus value should be equal to 1 for grid purpose.

 

It will be very helpful if anyone can help me with this doubt.

 

Thank you

Amit

[DrAmine]

Check the best practices for SRS under CFX reference guide or on customer portal if you or supervisor has access

[DrAmine]

.and in Fluent filtering is done by the grid itself so you need to invest more efforts in processing.

[sharm2a2]

Hello Abenhadj,

Thank you for your quick reply. 

Can you please elaborate 'filtering is done by the grid itself'. This is the first time I heard about this filtering process. 

 

Thank you

Amit

[DrAmine]

The filter is the grid itself anything smaller than the cell size won't be resolved and will be modeled.

[sharm2a2]

Hello Amine,

 

Thank you so much.

 

Amit