turbulent and laminar computation

sarwar251219@gmail.com · September 7, 2015, 12:59

hello evryone,first i want to say thad am new in cfd online and also in cfd fluent.acually my problem is that i want to do some laminar flow on conical fore body(one part laminar and 2nd part turbulent) and remaining parts to do turbulent compution,so plz sujest me the procedure.thanks

aerosjc · September 10, 2015, 23:46

Between laminar flow and turbulent flow, there is transition which is not fully understood.
Fluent software has a parameter, turbulence intermitency, to indicate that flow is laminar or turbulent. You can check that.
For real computation, I guess you can directly use turbulence model to solve the flow field. I mean, you leave the work to Fluent to determine where is laminar or turbulent flows.
Corrent me if I’m wrong.

FMDenaro · September 11, 2015, 03:32

The only way to approach "correctly" the transition from laminar to turbulent condition is resolving DNS. As it is computationally very expensive (and still impossible for some high Re flows), the only approximated formulation I can suggest is using in Fluent the LES formulation with dynamic modelling

September 7, 2015, 12:59	turbulent and laminar computation	#1
sarwar251219@gmail.com New Member md gulam sarwar Join Date: Aug 2015 Posts: 2 Rep Power: 0	hello evryone,first i want to say thad am new in cfd online and also in cfd fluent.acually my problem is that i want to do some laminar flow on conical fore body(one part laminar and 2nd part turbulent) and remaining parts to do turbulent compution,so plz sujest me the procedure.thanks

September 10, 2015, 23:46		#2
aerosjc Member Jingchang.Shi Join Date: Aug 2012 Location: Hang Zhou, China Posts: 78 Rep Power: 13	Between laminar flow and turbulent flow, there is transition which is not fully understood. Fluent software has a parameter, turbulence intermitency, to indicate that flow is laminar or turbulent. You can check that. For real computation, I guess you can directly use turbulence model to solve the flow field. I mean, you leave the work to Fluent to determine where is laminar or turbulent flows. Corrent me if I’m wrong.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
CFX Treatment of Laminar and Turbulent Flows	Jade M	CFX	18	September 15, 2022 07:08
Laminar vs Turbulent Navier-Stokes	truman	Main CFD Forum	8	July 10, 2017 07:20
Laminar doesn't converge; Turbulent models do?	Amit	FLUENT	11	April 23, 2015 22:55
Ratio of eddy viscosity to molecular viscosity : Laminar or turbulent flow?	JuPa	CFX	7	September 9, 2013 07:45
SimpleFoam: Laminar vs. Turbulent Convergence	JasonG	OpenFOAM	0	June 2, 2011 08:29

September 11, 2015, 03:32		#3
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,768 Rep Power: 71	The only way to approach "correctly" the transition from laminar to turbulent condition is resolving DNS. As it is computationally very expensive (and still impossible for some high Re flows), the only approximated formulation I can suggest is using in Fluent the LES formulation with dynamic modelling