RAL Seminar Series - "Evaluation of WRF-LES for Transport and Dispersion Modeling Over Complex Terrain"

Speaker:              Christopher Nunalee                          North Carolina State University                          ASP Graduate Student Fellow

Date:                   Thursday, December 19thTime:                   11amPlace:                   FL 2 Room 1001 Abstract: 

The vast range of space-time scales associated with turbulent flow over rugged terrain presents one of the greatest challenges to complex terrain dispersion modeling. Subtle variations in flow properties, linked to interactions with the topography, can be responsible for radically different scalar behavior eventually leading to large model errors. The popular WRF model contains a large-eddy simulation (LES) framework capable of capturing transient turbulence features associated with rugged terrain, such as boundary layer separation and recirculation zones. In this talk, passive scalars were introduced into the WRF-LES model in order to simulate scalar transport and dispersion over complex terrain. Using measurements from the Cinder Cone Butte (CCB) field campaign, we evaluate the ability of WRF-LES to realistically simulate the transport of Sulfur Hexafluoride (/SF/6) tracers over and around CCB under both neutral and stably stratified environments. We observe realistic scalar behaviors, such as plume sensitivity to thermal stability and wind direction and accuracy comparable to, or slightly better, than recent modeling results found by other computational fluid dynamics models. In addition, this talk will also highlight an ongoing community outreach project dedicated to inspiring students (ages 10-20) to pursue careers in the applied sciences with an emphasis on renewable energy. This broader impacts project is carried out and generously funded under the Warner Internship for Scientific Enrichment in memory of the late Tom Warner.

Will this event be webcast to the public by NCAR|UCAR?: 
Announcement Timing: 
December 18, 2013 to December 19, 2013