Terrain modeling and atmospheric turbulent flow solutions based on meteorological weather forecast data

Download

index.pdf

Date

2012

Author

Leblebici, Engin

Metadata

Show full item record

Item Usage Stats

177
views

146
downloads

In this study, atmospheric and turbulent flow solutions are obtained using meteorological flowfield and topographical terrain data in high resolution. The terrain topology of interest, which may be obtained in various resolution levels, is accurately modeled using structured or unstructured grids depending on whether high-rise building models are present or not. Meteorological weather prediction software MM5, is used to provide accurate and unsteady boundary conditions for the solution domain. Unsteady turbulent flow solutions are carried out via FLUENT with the help of several User Defined Functions developed. Unsteady flow solutions over topographical terrain of METU campus are computed with 25m x 25m x 15m resolution using structured grids. These FLUENT solutions are compared with the MM5 solutions. Also, the accuracy of the boundary layer velocity profiles is assessed. Finally, effects of surface roughness model extracted from MM5 for the region of interest is investigated. In addition, unsteady flow solutions over METU campus are repeated in presence of high-rise building models using unstructured grids with resolution varying from 5 meters around buildings to 80 meters further away. The study shows that unsteady, turbulent flow solutions can be accurately obtained using low resolution atmospheric weather prediction models and high resolution Navier-Stokes solutions over topographical terrains.

Subject Keywords

Atmospheric turbulence., Wind turbines., Weather forecasting.

URI

http://etd.lib.metu.edu.tr/upload/12614103/index.pdf
https://hdl.handle.net/11511/21400

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Atmospheric turbulent flowsolutions coupled with a mesoscale weather prediction model Leblebici, Engin; Ahmet, Gökhan; Tuncer, İsmail Hakkı (2013-01-01) Atmospheric turbulent flow solutions coupled with a mesoscale meteorological weather prediction software are obtained on terrain fitted high resolution computational grids using FLUENT as a CFD tool. The terrain topology of interest, which may be obtained in various resolution levels, is accurately modeled using unstructured grids. The widely used meteorological weather prediction software WRF is used to provide unsteady boundary conditions for the CFD solution domain. Due to difference of mesh structure an...
Multiregional Satellite Precipitation Products Evaluation over Complex Terrain Derin, Yagmur; Anagnostou, Emmanouil; Berne, Alexis; BORGA, Marco; BOUDEVILLAIN, Brice; BUYTAERT, Wouter; CHANG, Che-Hao; DELRIEU, Guy; HONG, Yang; HSU, Yung Chia; LAVADO-CASIMIRO, Waldo; MANZ, Bastian; MOGES, Semu; NIKOLOPOULOS, Efthymios I.; SAHLU, Dejene; SALERNO, Franco; RODRIGUEZ-SANCHEZ, Juan-Pablo; VERGARA, Humberto J.; Yılmaz, Koray Kamil (American Meteorological Society, 2016-06-01) An extensive evaluation of nine global-scale high-resolution satellite-based rainfall (SBR) products is performed using aminimumof 6 years (within the period of 2000-13) of reference rainfall data derived from rain gauge networks in nine mountainous regions across the globe. The SBR products are compared to a recently released global reanalysis dataset from the European Centre for Medium-Range Weather Forecasts (ECMWF). The study areas include the eastern Italian Alps, the Swiss Alps, the western Black Sea ...
Thermal Anomaly and Alteration Mineral Mapping in İzmir Dikili Region by using ASTER and Investigation of the Geothermal Potential of the Region Cambazoğlu, Selim; Yal, Gözde Pınar; Eker, Arif Mert; Koçkar, Mustafa Kerem; Osman, Şen; Akgün, Haluk (null; 2014-03-14) This study encompasses the detection, mapping and validation of hydrothermal alteration types and minerals, surface temperature anomaly mapping utilizing remote sensing methods in order to assess the geothermal potential of the Dikili region. The study area covers Bergama, Dikili, Çandarlı and Altınova districts located at the northern part of İzmir Province where fumaroles and numerous thermal water outflows with temperatures between 63°C and 89°C are present. The study area is located at the northern part...
Atmospheric Effects Removal for the Infrared Image Sequences Ozsarac, Seckin; Akar, Gözde (2015-09-01) Accurate correction of atmospheric effects on data captured by an infrared (IR) camera is crucial for several applications such as vegetation monitoring, temperature monitoring, satellite images, hyperspectral imaging, numerical model simulations, surface properties characterization, and IR measurement interpretation. Atmospheric effects depend on the temporal changes, i. e., year, season, day, hour, etc., and on the geometry between the camera and the measured scene, i. e., line of sight. The orientation a...
Progress in space weather modeling in an operational environment Tsagouri, Ioanna; Belehaki, Anna; Bergeot, Nicolas; Cid, Consuelo; Delouille, Veronique; Egorova, Tatiana; Jakowski, Norbert; Kutiev, Ivan; Mikhailov, Andrei; Nunez, Marlon; Pietrella, Marco; Potapov, Alexander; Qahwaji, Rami; Tulunay, Yurdanur; Velinov, Peter; Viljanen, Ari (2013-01-01) This paper aims at providing an overview of latest advances in space weather modeling in an operational environment in Europe, including both the introduction of new models and improvements to existing codes and algorithms that address the broad range of space weather's prediction requirements from the Sun to the Earth. For each case, we consider the model's input data, the output parameters, products or services, its operational status, and whether it is supported by validation results, in order to build a...

Citation Formats

E. Leblebici, “Terrain modeling and atmospheric turbulent flow solutions based on meteorological weather forecast data,” M.S. - Master of Science, Middle East Technical University, 2012.