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The IncompNS unit solves incompressible Navier-Stokes equations in two or three spatial dimensions. The currently released implementation assumes constant density throughout the simulation domain.
Multistep and Runge-Kutta explicit projection schemes are used for time integration. These methods are described in Armfield & Street 2002, Yang & Balaras 2006, and Vanella et al. 2010. Implementations using a staggered grid arrangement are provided for both uniform grid (UG) and PARAMESH adaptive mesh refinement Grid implementations. The MultigridMC and BiPCGStab Poisson solvers con be employed for AMR cases, whereas the homogeneous trigonometric solver + PFFT can be used in UG. Typical velocity boundary conditions for this problem are implemented.
More documentation to appear later.
As of FLASH4.4, Simulations that use the IncompNS unit should be configured to use
a special implementation of
Driver_evolveFlash
located in Driver/DriverMain/INSfracstep.
(Including IncompNS in the units of a simulation will automatically
pull this directory into the configuration.)
This requirement may change in the future.