Melanie Lipp authored Apr 25, 2018 and Dennis Gläser committed May 03, 2018

With contributions of Farid Mohammadi <farid.mohammadi@iws.uni-stuttgart.de>.

Kilian Weishaupt authored Apr 24, 2018 and Thomas Fetzer committed Apr 26, 2018

* rename elementFaceVars to elemFaceVars

Dennis Gläser authored Apr 05, 2018 and Timo Koch committed Apr 15, 2018

Contributions by Timo Koch, Kilian Weishaupt.

this also has the benefit that the base class is getting smaller with
the upwind scheme not being in it. Staggered, for example, does not use
an upwind scheme and thus always carried an invalid upwind scheme implementation
with it...

* better distinguish between total mass balance and component mass balances

Dennis Gläser authored Mar 16, 2018 and Timo Koch committed Mar 16, 2018

the non-isothermal specific property tags are now defined directly
where the respective type tag is declared.

* get the values for parallel and normal velocities directly in the
  fluxVars and not during the update of the faceVars
* this is necessary in the context of coupling when the velocities on the
  boundary shall be inferred from the other domain
* the gridFaceVars  are initialized (and thus updated)
  before any coupling context can be bound so this update step
  must not depend on some coupled context

* introduce upwind weight for momentum flux
* use convenience function to calculate all momentum fluxes
* rename computeNormalMomentumFlux to computeFrontalMomentumFlux
* rename computeTangetialMomentumFlux to computeNormalMomentumFlux
* move pressure term from  local residual to fluxVars
* use separate function to treat outflow boundaries
* improve docu and clean-up

* explicitly check for outflow BC
* small clean-ups
* improve docu