I've been reading the DualSPHysics guide and other papers through, in particle about the implementation of the laminar-SPS turbulence modelling scheme.
In Dalrymple 2006 I read that it is nessecary to apply a Shepherd filter since in this method density fluctuations will appear at the free surface. But since Shepherd filtering was abandoned in v4 of DualSPHysics there currently is no way of correcting the density fluctuations at the free surface unless I use delta-SPH?
So I guess my question is, if I use the laminar-SPS scheme I have to use delta-SPH to artificially diffuse the density, so:
- How do I know which artificial value to use? I know default is 0,1
- When I use the delta-SPH scheme will I be sure that the density fluctuations which would happen due to the turbulence scheme will be corrected and the weakly compressible fluid state is preserved?
Hope my questions makes sense, kind regards Ahmed