Sven Berger
Yes we have already discussed this on slack. This currently doesn't work since it will generate private links which cannot be linked to even within the project. Erik has also...
@LasNikas This seems to be a small issue left open. Can you finish this?
Check out this paper: Variational and momentum preservation aspects of Smooth Particle Hydrodynamic formulations, J. Bonet *, T.-S.L. Lok Here they claim in section 2.4.1 and 2.4.2. that you should...
yes the paper claims that `(p_a + p_b)/(rho_a rho_b)` should be used with a continuity formulation and` p_a / rho_a^2 + p_b / rho_b^2 `with summation density
Since they draw the conclusion purely on mathematical arguments it is probably true.
I fear that these different formulations are probably even case dependent.
And in "Robustness and accuracy of SPH formulations for viscous flow" by Mihai Basa et al. they claim that this leads to an improvement: 
Without a lot of reference cases this cannot be answered. Anyway this could be made into a paper.
I guess we should for now make these different formulations user selectable until we can draw a conclusion.
- There is also the option of using a paraview plugin, which is also a headache. Maybe for now: - We could also implement slices to be saved as image...