........................................................................................................................................III POPULÄRVETENSKAPLIG SAMMANFATTNING..................................................................... V ACKNOWLEDGEMENTS.............................................................................................................. VII LIST OF PAPERS.........

Z. H. Wang, P. H. Diamond, Ö. D. Gürcan, X. Garbet, and X. G. Wang School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China Department of Physics and Center for Astrophysics and Space Sciences, University of California at San Diego, La Jolla, California 92093-0424, USA WCI Center for Fusion Theory, National Fusion Research Institute, Gwahangno 113, ...

Slender high rise structures are exposed to aerodynamic problems connected to the windstructure interaction, for example vortex shedding or dynamic instability (e.g. galloping). Generally the design of these structures requires the aid of wind tunnel tests on scaled models. The paper investigates the aerodynamic behavior of a bluff body and the shape is adopted for section of the tower of a cab...

Through the wind velocity and direction monitoring system installed on Jiubao Bridge of Qiantang River, Hangzhou city, Zhejiang province, China, a full range of wind velocity and direction data was collected during typhoon HAIKUI in 2012. Based on these data, it was found that, at higher observed elevation, turbulence intensity is lower, and the variation tendency of longitudinal and lateral tu...

The wind farm program FLaP (Farm Layout Program), developed at the University of Oldenburg, has been extended to improve the description of wake development in offshore conditions. Especially the low ambient turbulence and the effect of atmospheric stability have been addressed. Model results have been compared with measured vertical wake profiles and mean turbulence intensities from the Danish...

The glide-path scans of the LIDARs at the Hong Kong International Airport (HKIA) are used to calculate the eddy dissipation rate (EDR), the internationally adopted metric for turbulence reporting/alerting, by using the structure function approach based on the radial velocity data. The EDR so determined is compared with the turbulence intensity calculated from the Quick Access Recorder (QAR) dat...

FSO communication systems links is vulnerable due to degrading effects of atmospheric turbulence and point errors. We investigate the error rate performance of Free-Space Optical (FSO) links over gamma-gamma turbulence fading channels in the presence of pointing error. Assuming Intensity-Modulation/Direct Detection (IM/DD) with On-Off Keying (OOK), a novel closed-form expression for BER of FSO ...

Sound propagation outdoors is strongly affected by atmospheric turbulence. Under strongly perturbed conditions or long propagation paths, the sound fluctuations reach their asymptotic behavior, e.g., the intensity variance progressively saturates. The present study evaluates the ability of a numerical propagation model based on the finite-difference time-domain solving of the linearized Euler e...

Quantitative description of the statistics of intensity fluctuations within spectral line data cubes introduced in our earlier work is extended to the absorbing media. A possibility of extracting 3D velocity and density statistics from both integrated line intensity as well as from the individual channel maps is analyzed. We find that absorption enables the velocity effects to be seen even if t...

Dynamic models for large eddy simulation of the G-equation of turbulent premixed combustion are proposed and tested in forced homogeneous isotropic turbulence. The basic idea is to represent the ‘‘filtered propagation term’’ as ‘‘propagation of the filtered front at higher speed,’’ where the enhanced filtered-front speed is modeled. The validity of the linear relation between the turbulent flam...