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Defines incompressible Navier-Stokes problems as a special case of general elliptic systems.

- Class:
**<NAVIER-STOKES-PROBLEM>** -
Navier-Stokes problem.

Superclasses: <ELLSYS-PROBLEM>

- Function:
**NAVIER-STOKES-INERTIA-COEFFICIENTS**`DIM``REYNOLDS` -
Yields a quasi-Newton linearization of the term

*u . grad u*which has the form*a Re u0 . grad u + b Re u . grad u0 = (a + b - 1) Re u0 . grad u0*a and b are given by the values of the special variables`*alpha*`and`*beta*`.

- Function:
**NAVIER-STOKES-PRESSURE-AND-CONTINUITY-COEFFICIENT**`DIM`&KEY (`ETA`1.0) (`XI`1.0) -
The pressure and continuity part of the Navier-Stokes equation. These parts can be multiplied by factors

`eta`and`xi`which can be useful for debugging, for example.