Johns Hopkins Turbulence Databases

Dataset description

Transitional boundary layer:

Simulation data provenance: Dr. Jin Lee and Prof. Tamer Zaki of JHU (see README-transition_bl for more details).

• Direct numerical simulation (DNS) of a transitional boundary layer over a plate with an elliptical leading edge.
• Navier-Stokes was discretized on a curvilinear grid and solved using a finite volume DNS code.
• A fractional-step algorithm was adopted, and the spatial discretization was a staggered volume-flux formulation.
• The viscous terms were integrated in time implicitly using the Crank-Nicolson and the advections terms were treated explicitly using the Adams-Bashforth.
• Pressure was treated using implicit Euler in the δp-form. The pressure equation was Fourier transformed in the span, and the resulting Helmholtz equation was solved for every spanwise wavenumber using two-dimensional multi-grid.
• After the simulation has reached a statistical stationary state, 4701 frames of data, which includes the 3 components of the velocity vector and the pressure, are generated and written in files that can be accessed directly by the database (FileDB system).
• Since the grid is staggered, data at the wall are not stored in the database. However, JHTDB provides values in the region between the wall and the first grid point, y∈[0, 0.0036], using 4th-order Lagrange polynomial inter- and extrapolation.
• The y-locations of the grid points in the vertical direction can be downloaded from this text file.
• The time-averaged statistics can be downloaded from this HDF5 file. Brief notes are here.