hairpin structures in turbulent baoundary layer

farz · January 28, 2012, 22:32

Hi, does anyone know how can I detect the hairpin structures in the turbulent boundary layer (on a flat plate without pressure gradient) in fluent?, is it possible to see the hairpin structures without using the UDF.
Thanks a lot.

ANTONY A R V · January 29, 2012, 02:05

I dont think so.

In FLUENT we will be using turbulence models to simulate the effect of turbulence in the flow field.

We dont model the transient transition from the laminar to turbulent flow.

It is not possible. May be with DNS it may be possible but it is in the research stage only.

farz · January 29, 2012, 03:40

Thanks a lot Antony, is it possible to see the streaks in the turbulent boundary layer in fluent?, if yes, how?

ANTONY A R V · February 1, 2012, 09:24

Steakline for steady flow can be obtained in the form of pathline and stream line. Unsteday flow provision is not there. I dont know if it is available in the latest version.

January 28, 2012, 22:32	hairpin structures in turbulent baoundary layer	#1
farz New Member farzin Join Date: Jan 2012 Posts: 6 Rep Power: 14	Hi, does anyone know how can I detect the hairpin structures in the turbulent boundary layer (on a flat plate without pressure gradient) in fluent?, is it possible to see the hairpin structures without using the UDF. Thanks a lot.

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January 29, 2012, 02:05		#2
ANTONY A R V New Member ANTONY AROUL RAJ V Join Date: Jan 2012 Location: Chennai Posts: 22 Rep Power: 14	I dont think so. In FLUENT we will be using turbulence models to simulate the effect of turbulence in the flow field. We dont model the transient transition from the laminar to turbulent flow. It is not possible. May be with DNS it may be possible but it is in the research stage only.

January 29, 2012, 03:40		#3
farz New Member farzin Join Date: Jan 2012 Posts: 6 Rep Power: 14	Thanks a lot Antony, is it possible to see the streaks in the turbulent boundary layer in fluent?, if yes, how?

February 1, 2012, 09:24		#4
ANTONY A R V New Member ANTONY AROUL RAJ V Join Date: Jan 2012 Location: Chennai Posts: 22 Rep Power: 14	Steakline for steady flow can be obtained in the form of pathline and stream line. Unsteday flow provision is not there. I dont know if it is available in the latest version.