# turbulence concept!!!

 Register Blogs Members List Search Today's Posts Mark Forums Read

 May 5, 2006, 23:59 turbulence concept!!! #1 vijesh joshi 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 dh 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 Ben Akih 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.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Mohsin FLUENT 2 October 3, 2016 14:18 Eric FLUENT 1 March 7, 2012 05:30 Wen Long Main CFD Forum 3 May 15, 2009 09:52 K.K.J.Ranga Dinesh Main CFD Forum 2 June 3, 2003 13:41

All times are GMT -4. The time now is 06:16.