Instationary/time-dependent flow around a cylinder

I found this example of a time-dependent flow around a cylinder solved using the FEA tool, but I am unable to find the setup tutorial or example model for this in stationary case using the FEA tool.

Is it possible for you to share the in-stationary case: https://www.featool.com/tutorial/2015/08/13/Accurate-Computational-Fluid-Dynamics-CFD-Simulations-with-FEATool/

I would like to know the solver and grid settings for the time-dependent case, if you can share them.

I also have an additional query, which is as follows: Instationary Flow Around a Cylinder

For this example of flow around a cylinder, the example mentions that for Re = 20, the reference Cd is 5.5795 based on the literature [1] and [2].

But I could not find this reference value from the literature for Re = 20 and flow around a cylinder.
Can you point me to an accessible link with this Cd reference value?

The instationary/time-dependent model is basically the same as the stationary flow around the cylinder tutorial, just with different inlet flow boundary condition and using the time-dependent solver. It is therefore only available as a m-script model:

ex_navierstokes6.m

Specifically, the inlet boundary condition Re ~ 100 is defined as:

     if ( opt.instatbc )  % Instationary BC 
       s_inflow = '6*sin(pi*t/8)*(y*(0.41-y))/0.41^2';
     else
       s_inflow = '6*(y*(0.41-y))/0.41^2';
     end

and solved for t = 0 - 8 s, with time step 0.02, and time-stepping scheme 2 (Crank-Nicolson):

    [fea.sol.u,tlist] = solvetime( fea, 'tstep', 0.02, 'tmax', 8, 'maxnit', 5, 'ischeme', 2 );

Changing these parameters in the stationary tutorial should give you similar results.

Links to accurate reference solutions for the 2D stationary cylinder CFD benchmark (Re = 20):

[1]: Nabh G. On higher order methods for the stationary incompressible Navier-Stokes equations. PhD Thesis, Universität Heidelberg, Preprint 42/98, 1998

[2]: John V, Matthies G. Higher-order finite element discretizations in a benchmark problem for incompressible flows. International Journal for Numerical Methods in Fluids, 37(8):885–903, 2001