Johns Hopkins Turbulence Databases

Channel Flow

Dataset
description

Channel flow:

Simulation data provenance: Collaboration of UT Texas and JHU, using the UT Texas DNS code (see README-CHANNEL for more details).

- Direct numerical simulation (DNS) of channel flow in a domain of size 8π x 2 x 3π , using 2048 x 512 x 1536 nodes.
- Incompressible Navier-Stokes equations are solved using the pseudo-spectral (Fourier-Galerkin) method in wall-parallel (x, z) planes, and the 7th-order B-spline collocation method in the wall-normal (y) direction.
- Simulation is run and equilibrated using prescribed bulk velocity=1, then switched to imposed pressure gradient (dP/dx = 0.0025) and further equilibrated.
- After the simulation has reached a (nearly) statistical stationary state, 4,000 frames of data with 3 velocity components and pressure are stored in the database. The frames are stored at every 5 time-steps of the DNS. This corresponds to about one channel flow-through time. Intermediate times can be queried using temporal-interpolation.
- The friction velocity is u
_{τ}= 0.0499. - The viscosity is ν = 5 x 10
^{-5}. - The friction velocity Reynolds number is Re
_{τ}~ 1000. - The y-locations of the grid points in the vertical direction can be downloaded from this text file; the corresponding B-spline knot locations can be obtained from this text file.
- A table with the time history of friction velocity Reynolds number can be downloaded from this text file.
- A table with the vertical profiles of mean velocity, Reynolds shear stresses, viscous stress, normal stress, mean pressure, pressure variance and pressure-velocity covariance in viscous units, can be downloaded from this text file.
- Files with tables of the streamwise (k
_{x}) spectra of u, v, w, p at various heights can be downloaded for the following y+ values: 10.11, 29.89, 99.75, 371.6, and 999.7. - Files with tables of the spanwise (k
_{z}) spectra of u, v, w, p at various heights can be downloaded for the following y+ values: 10.11, 29.89, 99.75, 371.6, and 999.7. - GetPosition and Filtering functions not yet implemented for the channel flow dataset.

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