- Development of numerical methods for the direct simulation of multiphase flows
- Compressible and incompressible multiphase flows
- Pressure-based flow solvers
- Coupling of compressible and incompressible flow regions
- Surface tension modeling
- Interface tracking schemes
Publications and talks
My publications and talks are available for download here.
- Member of the interdisciplinary Cluster of Excellence in Simulation Technology (SimTech)
- Associated member of the Sonderforschungsbereich/Transregio 40 “Technological foundations for the design of thermally and mechanically highly loaded components of future space transportation systems”
- Associated member of the Sonderforschungsbereich/Transregio 75 “Droplet dynamic processes under extreme ambient conditions”
Multiphase flows including a gas-liquid interface are omnipresent in daily life and they play a crucial role in nature and in technical applications. We are in direct contact to them during a rain storm, when having a shower or when we use medical sprays or other aerosols. But we also encounter them in a more indirect and hidden way when it comes to technical applications in the fields of food or spray processing. Another important example is the fuel injection process into a combustion engine. This list is far from being complete and lots of other examples may be added.
The focus of our research is on the direct numerical simulation of multiphase flows. Usually the incompressible Navier-Stokes equations are used for this purpose. The incompressibility assumption of the flow is justified in many cases and it basically introduces the separation of thermodynamics and hydrodynamics. For flows at low speed and ambient pressure a purely hydrodynamic treatment is admissible as the thermodynamic effects can be neglected in the absence of phase change. However, thermodynamics has to be taken into account for multiphase flows under more extreme conditions as it is the case for injection processes at high pressures and temperatures. In such cases, the thermodynamic properties of the fluids have to be considered and they have to be modeled by the compressible flow equations.
From a numerical point of view, compressible two-phase flows are challenging for two different reasons. At first, such flows usually are characterized by large jumps in the material properties across the interface. Additional trouble comes from differences in the equations of state that cause many numerical schemes to produce unphysical oscillations in velocity and pressure.
Our interest lies in the simulation of the above described compressible multiphase flows using a pressure-based numerical method. The research is directed to the development of a numerical scheme that allows the investigation of evaporation processes of single droplets at high pressures and temperatures.