DFG Schwerpunktprogramm 1276
Based on the definition of the projects MetStroem concentrates on three areas of application which register exemplarily the challenges of multi-scale modelling.
In many meteorological and fluid-dynamical processes gravity waves, inertial and compressional waves interact with vortices as well as with drop and particle clouds on different scales. Modelling and numerical approaches which are tailored to the exposition of scale-separated phenomena can be tested by that.
Typical examples in fluid dynamics and meteorology:
In boundary layers over complex boundaries the fluid-dynamics on the length scale of the larger geometrical elements interacts with turbulence generated by those elements. Such processes demand an approach which is able to register the diffuse transition of quasi-deterministic fluid mechanics above the integral turbulence length to the chaotic fluctuations below the same.
Typical examples in fluid mechanics and meteorology:
Also on small scales one finds multi-scaled mass exchange, impulse exchange and energy exchange. The consideration of small particles or drops in a buoyancy subjected fluid requires closure models which couple the particle dynamics with the smallest scales of the turbulence on two sides.
Typical examples of fluid mechanics and meteorology: