[Feature]: example - ramped inlet boundary conditon #274
Description
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Is your proposal related to a problem?
starting the simulation from standing still (u=0, p=1) can result in shocks and non-physical waves, when the inlet boundary conditon starts with full amplitude at t=0.
Describe the solution you'd like
Gradually increasing it from u(t=0)=0 to u(t=t_ramped)=u_full will smoothen the time period between initialization and convergence.
Describe alternatives you've considered
Depending on the reason a simulation has problems to come to a converged state, temporally increasing the viscosity could be an option too...
Additional context
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