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Search: Posts Made By: Hisham
Forum: OpenFOAM Programming & Development July 6, 2012, 07:58
Replies: 15
Views: 6,445
Posted By Hisham
Hi anishtain4 Sorry for the late reply .......

Hi anishtain4

Sorry for the late reply .... Yes I made a test solver (say fftFoam) and tested some numbers on an fft object. I can email it to you if you would like

Thanks
Hisham
Forum: OpenFOAM Programming & Development March 19, 2012, 19:32
Replies: 15
Views: 6,445
Posted By Hisham
An update: The dnsFoam solver uses the fft class....

An update: The dnsFoam solver uses the fft class.

@ kmooney: This is extremely nice of you :)
Forum: OpenFOAM Programming & Development March 16, 2012, 05:55
Replies: 15
Views: 6,445
Posted By Hisham
Hi lishijie Unfortunately, I believe that...

Hi lishijie

Unfortunately, I believe that the fft class in OpenFOAM is bugged because it gives different results compared to Matlab and Octave as I illustrated in my previous post.

To know how...
Forum: OpenFOAM Programming & Development November 13, 2011, 18:13
Replies: 15
Views: 6,445
Posted By Hisham
Hi Foamers, After using the fft class, it...

Hi Foamers,

After using the fft class, it does not give the same results as Matlab or Octave. As a simple example I fft the following:
[0.1000
2.0000
-0.1000
5.0000
6.0000...
Forum: OpenFOAM Programming & Development November 3, 2011, 07:57
Replies: 15
Views: 6,445
Posted By Hisham
I got it! Regards Edit: Comparing...

I got it!

Regards

Edit:

Comparing results from FOAM's fft class with Octave, there is something wrong. The results are not even close and Octave numbers look logical. Has anyone experienced...
Forum: OpenFOAM Programming & Development November 3, 2011, 04:56
Replies: 15
Views: 6,445
Posted By Hisham
FFT in OpenFOAM

Dear Foamers,

I have been trying to use the fft class. I have hard time understanding how the code checks for a 2^n number of samples. The code uses (I think) the bitwise "and" operator:

from...
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