navier_stokes_3d_exact, a FORTRAN90 code which evaluates exact solutions to the incompressible time-dependent Navier-Stokes equations over an arbitrary domain in 3D.
The given velocity and pressure fields are exact solutions for the 3D incompressible time-dependent Navier Stokes equations over any region.
To define a typical problem, one chooses a bounded spatial region and a starting time, and then imposes boundary and initial conditions by referencing the exact solution appropriately.
In the Ethier reference, a calculation is made for the cube centered at (0,0,0) with a "radius" of 1 unit, and over the time interval from t = 0 to t = 0.1, with parameters a = PI/4 and d = PI/2, and with Dirichlet boundary conditions on all faces of the cube.
The computer code and data files made available on this web page are distributed under the MIT license
navier_stokes_3d_exact is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
NAVIER_STOKES_2D_EXACT, a FORTRAN90 code which evaluates exact solutions to the incompressible time-dependent Navier-Stokes equations over an arbitrary domain in 2D.