The CFD program FS3D (Free Surface 3D) has been used at ITLR for more than 20 years and is constantly being further developed. Direct numerical simulation (DNS) is used to solve the incompressible Navier-Stokes equations. This means that no turbulence models are used, the occurring flow phenomena are captured by a correspondingly fine spatial and temporal resolution. To deal with the high computational effort involved, FS3D is parallelized using the MPI libraries and OpenMP, so that even complex problems can be investigated.
FS3D uses the Volume-of-Fluid (VOF) method to describe multiphase flow. The different phases are represented by additional field variables. In the case of a two phase flow, only one variable f is needed that can take per definition always values between 0 and 1. Based on this f distribution, the PLIC (piecewise linear interface calculation) method is used to reconstruct the actual interface.
- Heat and mass transfer of strongly deformed droplets
- Valve cooling
- Rise behavior of bubbles
- Turbulent inflow generation
- Evaporating Droplet