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About inlet peturbation generation method?

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Old   May 4, 2006, 04:09
Default About inlet peturbation generation method?
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leaf
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Is there any literature about inlet perturbation generation method?I intend to add some random perturbation to the shear layer of a jet and investigate how these perturbations evolves in space and time. Any book or paper will do.
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Old   May 4, 2006, 04:11
Default Re: About inlet peturbation generation method? *NM*
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Old   May 4, 2006, 06:22
Default Re: About inlet peturbation generation method?
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diaw
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A thought... Why not add 'well defined' perturbation signals to your flow in preference to 'random' - eg. square-wave pulse, triangular spike, & so on. Look at consistently varying certain key parameters eg. pulse amplitude, pulse duration, pulses per second. Then repeat the exercise with increasing jet velocity. You are bound to end up with some extremely interesting results.

Turn off the convection-stabilisation.

Enjoy...

diaw...
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Old   May 4, 2006, 09:05
Default Re: About inlet peturbation generation method?
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Tian_FB
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Well,I think you may do some worke on the theory of stability of the flow if could.Or, you may leran about stability of flow from some text and I think you may have some ideals.
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Old   May 4, 2006, 09:21
Default Re: About inlet peturbation generation method?
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Guillaume
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Check towards turbulent DNS/LES papers. It is sometimes used flow perturbations. Otherwise, they initialise with prescribed turbulent fields but it is not of interest for you.
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Old   May 4, 2006, 14:57
Default Re: About inlet peturbation generation method?
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agg
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Try this one - i use it and it works nicely

"A digital filter based generation of inflow data for spatially developing direct numerical or large eddy simulations" - M. Klein, A. Sadiki, J. Janicka

Journal of Computational Physics 186 (2003) 652"665

I have a pdf version of the paper, if you don't have access to it.
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