# LES transitional pipe entrance flow

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 August 6, 2011, 10:00 LES transitional pipe entrance flow #1 New Member   hasan Join Date: Aug 2011 Location: Diyarbakır / Turkey Posts: 3 Rep Power: 8 I am a doctarate student and my thesis is the numerical study on transitional pipe flow at the entrance. I am studying numerical for pipe entrance transitional (laminar to turbulent Re= 4000) flow I want to simulate turbulent fluctuation (pressure fluctuation) and then compare them with experimental results of mine. so I have to use LES modelling in FLUENT. I draw the pipe geometry and meshing it in Ansys workbench. now I want to solve it by using LES model in FLUENT. I used smagorinsky lilly model for SGS. but did not run. I study the notes in the HELP menu but didn't find any knowladge about the problem. *how can I simulate the laminar to turbulent transitional flow in the entrance of pipe. is there any tutorials or notes to help me in this numerical study. await of your helps

October 11, 2013, 11:57
#2
Senior Member

Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 7
Quote:
 Originally Posted by hasanduz I am a doctarate student and my thesis is the numerical study on transitional pipe flow at the entrance. I am studying numerical for pipe entrance transitional (laminar to turbulent Re= 4000) flow I want to simulate turbulent fluctuation (pressure fluctuation) and then compare them with experimental results of mine. so I have to use LES modelling in FLUENT. I draw the pipe geometry and meshing it in Ansys workbench. now I want to solve it by using LES model in FLUENT. I used smagorinsky lilly model for SGS. but did not run. I study the notes in the HELP menu but didn't find any knowladge about the problem. *how can I simulate the laminar to turbulent transitional flow in the entrance of pipe. is there any tutorials or notes to help me in this numerical study. await of your helps
Hi, did you find any solution? I am also searching a tutorial using LES in Fluent. I want to simulate the turbulent flow in pipe using LES.

October 11, 2013, 17:59
#3
Senior Member

Filippo Maria Denaro
Join Date: Jul 2010
Posts: 3,506
Rep Power: 40
Quote:
 Originally Posted by Goutam Hi, did you find any solution? I am also searching a tutorial using LES in Fluent. I want to simulate the turbulent flow in pipe using LES.
but what's the problem? the pipe is periodic along the axis? You can fix a pressure gradient in the momentum equation and run the fractional step method, using LES with dynamic Smaogorinsky.

 Tags laminar to turbulent, pipe entrance, pipe flow, transient flow

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