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IMHO it is perfectly okay to have some references to wikipedia for
basic stuff. Reason: Other online sources are also not reliable and
can usually found in the reference section of the wikipedia
article. (also, even for normal textbooks, there are the occational
errors.)

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{gas|liquid}HeatCapacity was not defined for the tabulated component

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somehow this change was "lost in merge"

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mainly to make the heat capacity consistent with the enthalpy

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- extend some comments
- assume an ideal mixture for gas everywhere, i.e. use the partial
  pressure to calculate the "partial" specific quantities like
  e.g. the specific partial enthalpies of water and nitrogen
- let the water and nitrogen component determine the "partial
  densities" of gas if the complex relations are enabled. before, an
  ideal gas was assumed. (now the individual components can be
  non-ideal gases, but we still assume an ideal mixture.)

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basically, you now need to specify --enable-quad in the configure
flags, and set the "Scalar" property to "quad". this only works with
GCC 4.6 and has some problems with the decoupled models.

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fixed 2p test: density for initial/BC had been hardcoded for one specific FluidSystem, it is now general, because c6834 motivated usage with several FluidSystems.

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for mixtures using cubic EOS, this means that the parameters of the
pure components do not need to be re-calculated if updateComposition()
is called. (they only depend on temperature!) this is a actually a
quite important optimization for cubic EOS because calculating the
parameters of the pure components is the most expensive part in
calculating parameters of the mixture.

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For cubic EOS, the critical values only depends on the attractive
paramter "a" and the co-volume of the fluid "b" which makes them an
easy prey for tabulation. also added: a class which does bi-linear
interpolation on an arbitrary function.

TODO: extend Dumux::Tabulated2DFunction so that upper and lower limit
      curves f(x) and g(x) can be specified and the sampling points do
      not need to be equidistant anymore. If this is done, use it for
      Dumux::TabulatedMaterial2.

MORE TODO: In Dumux::Tabulated2DFunction, do not use linear
           interpolation, but take the partial derivatives at the
           sampling points into account. then, interpolate the partial
           derivatives linearly between the sample points. I have not
           spend too much time thinking about the, though...

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an overlay fluid state takes an arbitrary other fluid state as an
argument to which it forwards everything except the quantity which it
overlays.

also, the fluidsystems test now tests all fluid states for API conformance...

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decoupled: make test_dec2p2cproblem compile, fix include of "defaultcomponents.hh" in old_fluidsystems/h2o_n2_system.hh

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this fixes the NCP flash test

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this makes the fluid framework work standalone, as requested
e.g. today by Knuth-Andreas Lie of OPM fame...

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