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CIMMSE TC Wind Group Conference Call

CIMMSE TC Wind Group Conference Call. Wednesday, June 5 th , 2013 11:00 AM. Agenda. Improved modified Rankine vortex interpolated wind images Modeling Focus Literature review Goals of simulations Initial WRF-LES setup. Improved Modified Rankine Vortex Interpolated Wind Images.

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CIMMSE TC Wind Group Conference Call

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  1. CIMMSE TC Wind GroupConference Call Wednesday, June 5th, 2013 11:00 AM

  2. Agenda • Improved modified Rankine vortex interpolated wind images • Modeling Focus • Literature review • Goals of simulations • Initial WRF-LES setup

  3. Improved Modified Rankine Vortex Interpolated Wind Images • Jonathan had requested images of some of the storms with the improved error function be posted online/be made available for download • Select images have been posted to: https://sites.google.com/a/ncsu.edu/modified-_rankine_improvements/ • Collaborators are encouraged to examine images and provide comments • Where to go from here in terms of R2O?

  4. Modeling Focus • Climatology aspect of the study has largely been completed • Gust factors as a function of sustained wind speed, wind direction, and distance from coastline using ASOS data • NDFD verification of recent storms impacting the region • Potential improvement to the wind interpolation method used in the TCMWindTool • Now can approach from more of a dynamical perspective with aid of WRF • WRF-LES option as of WRF V3

  5. Resolved  Subgrid Large-Eddy Simulation (LES) Subgrid Resolved Log(Ek) kc = /f Log(k) Physical Space Fourier Space (Courtesy: Dr. Sukanta Basu, NC State)

  6. Literature Review • WRF-LES has been used quite frequently in operational community for examining small scale turbulence in the boundary layer • Very few studies have used WRF-LES for tropical cyclones

  7. Modeling Goals/Focuses • Use Irene (2011) as a first case study • Conducted 24 hour WRF-LES simulation near location of landfall beginning at 0000 UTC 27 August • Examine large eddy circulations within the boundary layer • Conduct TKE budget to explore relative magnitude of contributions of the various terms • Examine gust factors at various locations within inner domain (compare to the climatology analysis we have conducted) • Sensitivity studies • Lower level stability • Storm intensity • Other suggestions?

  8. Modeling Setup • 5 Domains, with innermost two domains having no PBL scheme • Use of 1/16° daily SST analyses, 0.5° six hourly GFS analyses for boundary conditions • Grid Spacing (consistent with Zhu et al. 2008): • D1: 8.1 km D3: 900 m D5: 100 m • D2: 2.7 km D4: 300 m

  9. DiscussionNext Conference Call: Wednesday, July 10th, 2013 11 AM

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