Two files, StokesVideoWriter.m and ParallelStokesVideoWriter.m, support flow fields that change over time. A simple example is shown here.

coeff = 1/6;

for c = 1:nsteps

%% Time-Dependent Boundary Velocity

% velocity starts as sin(2theta), converges onto sin(6theta)

rhs = [real(sin((2+coeff*c/nsteps).*s.t).*s.tang);imag(sin((2+coeff*c/nsteps).*s.t).*s.tang)];

%

% timestepping and video-writing here

%

%

end