Item: Online nwp-model data as boundary conditions for snow drift simulation
Title: Online nwp-model data as boundary conditions for snow drift simulation
Proceedings: International Snow Science Workshop, Davos 2009, Proceedings
Authors: Simon Schneiderbauer and Stefan Pirker, Institute of Fluid Mechanics and Heat Transfer, Johannes Kepler University, Altenbergerstr. 69, Linz, Austria
Abstract: The open boundary conditions for the computational fluid dynamics simulation of the micro- and meso-scale flow over the Grimming mountain, Austria, are determined by an optimization approach. The Numerical Weather Prediction (NWP) model ALADIN–Austria provides data of wind speed and wind direction at virtual weather balloons within the area of interest. Moreover, the numerical model includes buoyancy, thermal stratification, adiabatic heating and turbulence effects. Furthermore, it is applied to the flow over the Grimming mountain and the results are validated by station data and show suitable correlation with the measurements. In addition, the wavelength of lee gravity waves is in good agreement with analytic approximations and gives an additional validation of the presented model. Finally, the presented model is able to serve as framework for particle transport simulations as snow drift.
Keywords: open boundary conditions, optimization, boussinesq approximation, cfd
Digital Abstract Not Available