laminar regime

[LAYLA FOURA]

Hello Neks

 Am new to Nek 5000 and struggling it

At this time having the script I want to simulate a laminar flow with Re=2000

It is the first step in the logic to assure a transition to turbulence

So my first objective is visualizing the laminar regime with Re=2000

As an initial try the result is in the pictures in attach which I think that is a turbulent regime

And here is the content of the file expansionLong.par

[GENERAL]
stopAt = endTime
endTime = 100
dt = 1.0e-3
writeControl = runTime
writeInterval = 1.0

[PROBLEMTYPE]
equation = incompNS

[VELOCITY]
density = 1.0
viscosity = -2000
residualTol = 1e-6

[PRESSURE]
residualTol = 1e-4

thank you for your reply

[Eduardo Martini]

Hi Layla,

It seems that you are running a (2D?) jet, right?  Have you tried running the simulation for a longer time? It seems that the "turbulence" is located on the leading, transient part of the jet. I am guessing that your simulation will converge to a more laminar state with time.

Another comment, if you are looking for a free jet, you should probably increase the domain size perpendicular to the jet. On the pictures you sent the flow seems quite confined.

Best

Eduardo