Turbulent Channel Flow

Preliminary Check List

Mass flow from <logfile.dat>
- Is the mass flow rate constant?
- Is the bulk-mean velocity (U_b) equal to unity? If not, rescale the velocity to make U_b=1.

Skin friction or Re_tau from <tautotal1.dat>
- Is it in equilibrium?
- Is it at the target Re_tau value?
Velocity and pressure from <freq1.dat>
- How does the flow look at different y locations?
- Are they turbulent/laminar?
- Is it in equilibrium?
Time step size from <cfl.dat>
- Is the time step constant?
- Is the time step too large/small?

Time mean velocity profile from <umean-txza.dat>
- U, u', v', w' - Does it compare well with other DNS data?
Reynolds shear stress <shear-txza.dat>
- Is the total shear stress linear?

Velocity and pressure contours in the xz plane from <up2-xz.plt>
- Are low speed streaks clearly seen?
- Is the velocity field periodic in the streamwise direction?
- Are there any spurious peaks?
- Is the pressure fluctuations periodic or NOT?
Velocity and pressure contours in the xy plane from <up2-xy.plt>
- Is the high speed fluid in the channel centre region?
- Is the no-slip boundary condition satisfied near the channel walls?
- Does the w contours show the characteristic patterns?
Velocity and pressure contours in the yz plane from <up2-yz.plt>
- Does the vector plot show the streamwise vortices?
- Does the pressure contours show the centre of the streamwise vortices?