Hi Guillermo, What you right is correct the with four planes, plane 0 and 1 are the first Fourier mode which is really the mean mode and the imaginary part of the mean mode which by definition is zero. Planes 2 and 3 are the real and imaginary components of the first harmonic (i.e. cos(Pi z) and sin(Pi z). Cheers, Spencer.

On 25 Jul 2019, at 11:02, Guillermo <guillermo180395@gmail.com> wrote:

Dear all,

I am using the homplane FieldConvert module with the wavespace option , but I do not completely understand the output (fld) result. I have performed a quasi 3D simulation, with up to 3 Fourier modes (HomModesZ = 4). Then, I use the FieldConvert -m homplane:wavespace:planeid=<value> ... command to obtain the Fourier coefficients. I have extracted 4 different planes, i.e. value={0,1,2,3}. I would like to know what is the information contained in the fld output files. Does planeid=0 and planeid=1 correspond to the real and the imaginary parts, respectively, of the Fourier coefficient for the mode 0, and planeid=2 and planeid=3 correspond to the real and the imaginary parts, respectively, of the Fourier coefficient for the mode +-1?

Thank you in advance.

Regards, Guillermo

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Spencer Sherwin FREng, FRAeS Head, Aerodynamics, Director of Research Computing Service, Professor of Computational Fluid Mechanics, Department of Aeronautics, s.sherwin@imperial.ac.uk South Kensington Campus, Phone: +44 (0)20 7594 5052 Imperial College London, Fax: +44 (0)20 7594 1974 London, SW7 2AZ, UK http://www.imperial.ac.uk/people/s.sherwin/