|
[Sponsors] |
May 5, 2006, 23:59 |
turbulence concept!!!
|
#1 |
Guest
Posts: n/a
|
Hello friends. I saw turbulence 1%, 5%, 10% & above in CFX. But what is the concept behind these words? What actually happens in the solver when we choose the desired turbulence model? These two are my questions. Thank you.
|
|
May 6, 2006, 07:16 |
Re: turbulence concept!!!
|
#2 |
Guest
Posts: n/a
|
The percentages refer to turbulence intensity. The documentation in "Turbulence and Near Wall Theory" explains the modelling concepts of all turbulence models in CFX.
|
|
May 7, 2006, 20:18 |
Re: turbulence concept!!!
|
#3 |
Guest
Posts: n/a
|
hi vijesh! as already mentioned by dh, those percentages refer to the turbulence intensity in the flow. it is the percental ration of the rms of the fluctuating part of the velocity to the mean steady velocity. that 1% would mean that the rms of fluctuation is 0.01 times the average velocity of the flow. most turbulence model require the specification of this intensity and a length scale or time scale. from these two parameters, the dissipation is computed and the local eddy viscosity is determined. the effective viscosity is then used in the Reynolds-averaged navier stokes. best thing is always to look up what the different parameters mean in the cfx help manual.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Turbulence postprocessing | Mohsin | FLUENT | 2 | October 3, 2016 14:18 |
Question on Turbulence Intensity | Eric | FLUENT | 1 | March 7, 2012 04:30 |
Discussion: Reason of Turbulence!! | Wen Long | Main CFD Forum | 3 | May 15, 2009 09:52 |
Open Challenge for Concept of Turbulence | K.K.J.Ranga Dinesh | Main CFD Forum | 2 | June 3, 2003 13:41 |