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-   -   Instantaneous and mean velocity vectors look same (https://www.cfd-online.com/Forums/fluent/37386-instantaneous-mean-velocity-vectors-look-same.html)

anindya July 26, 2005 17:51

Instantaneous and mean velocity vectors look same
 
I am facing this problem for a long time. In transient analysis, I enable data sampling. When I look at the instantaneous and mean velocity vectors, they look exactly the same. This happened in 6.1 and also in 6.2. I have the feeling that the mean velocity vectors are not shown properly and instead it shows the same instantaneous vectors too.

But the instantaneous and mean velocity contours look different as it should be.

Anyone has any idea what is wrong? Is this a bug in fluent? I have run my simulation for a long enough time.

Thanks

Anindya

zxaar July 28, 2005 04:44

Re: Instantaneous and mean velocity vectors look s
 
okey, here is the solution to your problem:

go to vector panel, you will see on the left side options for scale factor then skip ,

down here below "vector options" , there is something called custom vectors, open this panel and create the vectors based on the "unsteady statistics"

that is chose x y and z components from unsteady statistics or mean flow data, and then plot it, this is your correct vector plot you need.


Anindya July 28, 2005 18:03

Re: Instantaneous and mean velocity vectors look s
 
Thanks a lot yaar. It works perfectly.

One more question. When I want a mean profile (of say velocity), I use unstaeady statistics panel and then choose mean velocity. right? or do I do something else just like getting the mean vectors?

Sincerely,

Anindya

zxaar July 28, 2005 23:11

Re: Instantaneous and mean velocity vectors look s
 
yes exactly


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