LymnoPARH videos
Internal Waves
Internal wave experiment  two layers: salty water (lower layer) and freshwater (upper layer). The experiment shows the internal wave Seiche V1H1 and some KelvinHelmholtz instability which promote vertical mixing. This experiment was performed by Ricardo RománBotero and Luis Fernando Ospina in the Hydraulics Laboratory of the Universidad Nacional de Colombia, Facultad de Minas  PARH (Posgrado en Aprovechamiento de Recursos Hidráulicos) There is an interesting research (Lee et al., 2013) that uses the Youtube video as a test with the aim to validate the theory developed in that research. The article, named "on the gravity driven force terms of single pressure onedimensional multifluid flow model in horizontal channel and their validation", can be freely downloaded from the web. Unfortunately the link referenced in the paper is incorrect. Paper link. 

Kelvin Helmholtz simulation
Simulation using ANSYS by Andrés Felipe Posada This simulation was accomplished with a finite volume numerical scheme and VOF model. The solution was run in parallel with 4 processors. The color represents the volume fraction. The domain of length (1,0 m and height of 0,2 m) was discretized in 66600 rectangular elements (dx=3mm and dy=1mm). Initially, we have u=1 m/s in the upper half region and u=1 m/s in the lower half region. The time step was 0,005 seconds and the total simulation time was of 0,285 s. The lateral boundary conditions were set periodic, considering a domain that extends to the infinity on the horizontal direction. For the definition of the initial condition we used an ANSYS User Defined Function and a patch iso value with a sinusoidal form. The time for the end of exponential growing of billows was around of 0,04 seconds. A Spanish presentation about the method can be found here 
