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Forum: Main CFD Forum

July 10, 2013, 13:01

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

\bar{u}^{\varphi}=\sum_{k=1}^Nu_k^{\varphi} is my...

\bar{u}^{\varphi}=\sum_{k=1}^Nu_k^{\varphi} is my mean, here \varphi is the phase of the flow, I typically use about N=250 realizations of each phase.
I calculate fluctuation component by...

Forum: Main CFD Forum

July 10, 2013, 12:24

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

Yeah, the spatial resolution of the data was...

Yeah, the spatial resolution of the data was something I was worried about at the first place. While I can improve on the resolution to some extend, I don't think the improvement will be that...

Forum: Main CFD Forum

July 9, 2013, 19:34

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

Here is what I got ...

Here is what I got

http://img23.imageshack.us/img23/566/nnvx.png

I am not quite sure I believe it though :( I expected the energy to start a bit higher. That is something for me to think about...

Forum: Main CFD Forum

July 8, 2013, 18:32

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

Thank you very much Filippo! I'll give it a try.

Thank you very much Filippo! I'll give it a try.

Forum: Main CFD Forum

July 8, 2013, 17:49

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

Thanks Filippo! I can potentially refine the...

Thanks Filippo!

I can potentially refine the the spatial interval by reprocessing the data with a smaller interrogation window (data is from PIV). I guess realistically, the refinement will not be...

Forum: Main CFD Forum

July 8, 2013, 14:19

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

Hi Filippo, The data that I currently have...

Hi Filippo,

The data that I currently have is 2D from experiments with a grid resolution of ~0.7mm along streamwise direction. If I understand you correctly, I can calculate R(x0,r) at y0, with...

Forum: Main CFD Forum

July 8, 2013, 13:55

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

I would say I am interested in both. Let me...

I would say I am interested in both. Let me explain why:

I wanted to calculate coefficient of correlation so I can see how it declines
over streamwise direction, which, if I understand...

Forum: Main CFD Forum

July 8, 2013, 13:04

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

Hi Filippo, Thank you for the reply! What...

Hi Filippo,

Thank you for the reply! What you wrote are exactly two steps that I understand and confused about. Let me try to explain.

at x=x0, I do calculate R(x0,r), the way you mentioned,...

Forum: Main CFD Forum

July 8, 2013, 04:07

Replies: 21

2-point spatial velocity correlation

Views: 11,604

Posted By alexbn024

2-point spatial velocity correlation

Hello all,

I was trying to implement 2-pt spatial velocity correlation to my data (ensembled averaged pulsatile flow through the pipe) but it seems like I am getting lost in the process.

Here...

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