Learning Forum

[arunsp453]

 

How to do time averaging of velocity field?

brief explanation.

i done the simulation for mixing of air and swirled air which are passing through central and annular pipe and i am looking for velocity field in outer domain.

yes i am getting velocity field but since the flow is turbulent, i expect velocity field is composition of mean and fluctuating velocity component.

so i would like to get time averaged velocity so the field is smooth.

 

should i consider the iterations once after the solution got converged? or is their any hint for my problem?

 

thank you

[DrAmine]

I assume you are using standard RANS turbulence model and the velocity you see is the time dependent mean velocity without any turbulence dependent fluctuations.

[arunsp453]

Yes i am using Reynolds stress model and i am just piloting velocity contours in the 
CFD post once after solution gets converges.... i want data of time averaged velocity. should i run the simulation in transient mode to get time averaged velocity or how it is so?

[Rob]

Note: I've locked the other thread on this subject. Please don't post questions more than once in different places. 

[arunsp453]

i am sorry..

[DrAmine]

 To get transient averaged data you need to enable data sampling in Fluent or use a script in CFD-Post to do the transient average there if you forgot to do that in Fluent.

[arunsp453]

thank you, i enabled the data sampling for time statistics. 

what this ''user memory location'' and ''node memory location''.? are these options help to do time averaging? 

[DrAmine]

Yes possible by UDF. Transient data sampling is built-in and you do not require user defined memory locations to do sampling.

[arunsp453]

Thank you, abenhadj

[DrAmine]

Please mark this as is Solved.