New Process: Stokes flow
This pull request adds a new process named
StokesFlow for simulating the flow in the free-flow region. The set of the partial differential equations being solved includes momentum equations and a continuity equation. The liquid velocity and pressure both are treated as the primary unknown variables of the stokes equations and simultaneously solved in a mixed finite element space. The solution of the stokes equation follows the standard Taylor-Hood scheme, mimicing the implementation of the
HydroMechanics process. Thanks for the technical supports of @wenqing and @endJunction.
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