[RenardP]

Hello,

I'm trying to simulate the transition on a flat plate using an extremely fine mesh and a high order DNS.

I wonder what boundary conditions I need to impose in order to obtain transition. Because on a flat plate without a pressure gradient I suppose the only factors that can trigger transition will be the free stream turbulence and the surface roughness. I don't plan to include the surface roughness into this simulation so i suppose if I don't somehow include some fluctuations in the boundary condition I will never be able to catch the transition.

How will be best to include these fluctuations ? I was thinking at adding some random noise (or to use a step function at each time step) to alter the speed in the chordwise direction.

Thanks.

[hadesmajesty]

I think you may read the papers by Fasel about how to generate disturbance to produce transition.

[RenardP]

This is the article ?

"Spatial direct numerical simulation of transition phenomena in supersonic flat plate boundary layers"

If not, can you please send me the title of Fasel paper.

Thanks.

[SKK]

The following papers might be of help, although some of them are for bypass transition...

http://www.liv.ac.uk/~em22/papers/GT-2002-30238.pdf

http://www.liv.ac.uk/~em22/papers/96-GT-444.pdf

http://www.liv.ac.uk/~em22/papers/origins_of_spots.pdf

[RenardP]

Thanks SSK

[ghazanfarzahedi]

Dear SSK

Your lins are very useful.

I'm working on transition modeling in flat plate too. I need details of some experimental data. Would you help me how can i found them?

ghazanfar.zahedi@gmail.com

Thanks alot for your favor

Ghazanfar Zahedi