Ventilation of a Mid-Size City under Stable Boundary Layer Conditions: A Simulation Using the LES Model PALM

City centers have to cope with an increasing amount of air pollution. The supply fresh is crucial yet difficult ensure, especially under stable conditions the atmospheric boundary layer. This case study used PArallelized Large eddy simulation (LES) Model PALM investigate wind field over urban lake that had once been built as a designated corridor for city center Münster, northwest, Germany. model initialization was performed using main direction and layer input. initial temperature profiles included weak nocturnal low-level jet. By emitting passive scalar at one point on top bridge, dispersion could be traced lake’s surface, within street canyons leading above. concept ventilation confirmed in principle, but took direct route from shore above former river bed its adjoining streets rather than through canyons. According scalar, half supplied originating lake. proved useful tool corridors conditions.