5716000929
85%
master: 85%

Ran 31 Jul 2023 02:45PM UTC

Jobs 0

Files 0

Run time –

Badge

Embed ▾

pending completion

Build # 5716000929

Build Type

push

github

Committed by

web-flow

Commit Message

Compute surface elevation using IFFT (#250)

* Prevent nan values for zero-frequency component in spectrum

Previously providing a zero frequency when creating a spectrum (JONSWAP or Pierson Moskowitz) produced a NaN value. This is due the f^-5 and f^-4 terms in the calculation.

The zero frequency is a valid input and is important when calculating the surface elevation from the spectrum. We know, however, that the zero frequency should __always__ have zero amplitude as the surface elevation has a mean of zero.

This change ensures that if a zero frequency is provided, the amplitude is set to zero.

* Compute surface elevation using IFFT

Previously the surface elevation was only computed using the 'sum of sines' method. This has been found to be prohibitively slow when computing long duration surface elevation traces.

This commit introduces the capability to compute the surface elevation using the more computationally efficient IFFT. The IFFT routine is used by default if no frequency bins are provided and the input frequency vector is equally spaced.

For example a 1hr sea state realisation at 20Hz took 11s to compute using the 'sum of sines' and 0.007s using the IFFT.

Fixes #229

* add docstrings to surface_elevation

* update surface_elevation calls in examples

---------

Co-authored-by: akeeste <akeeste@sandia.gov>

Run Details

Source Files on build 5716000929

Detailed source file information is not available for this build.

MHKiT-Software / MHKiT-Python / 5716000929
85%
master: 85%

README BADGES
x

Markdown

Textile

RDoc

HTML

Rst

Source Files on build 5716000929

MHKiT-Software / MHKiT-Python / 5716000929 85% master: 85%

README BADGES x

Markdown

Textile

RDoc

HTML

Rst

Source Files on build 5716000929

MHKiT-Software / MHKiT-Python / 5716000929
85%
master: 85%

README BADGES
x