Presentation TDG

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Presentation TDG

  1. 1. The JHU Turbulence Database Cluster<br />Visualization with Matlab<br />
  2. 2. Introduction<br />Easy and fast accessibility to the database<br />Main problem: request time limits number of points to fetch<br />What has been done so far:<br />2D vector map<br />2D vector map with close-ups<br />3D iso-vorticity surfaces<br />5/18/11<br />2<br />
  3. 3. Caching requests<br />To prevent repetitive requests<br />Cache files locally stored<br />Fast development on custom applications<br />Preloading data in cache<br />5/18/11<br />3<br />
  4. 4. Built-in SOAP functions<br />Very time consuming due to DOM approach<br />Bottleneck: constructing XML request and parsing XML response<br />Solution: fast rewritten SOAP functions<br />Results: large time gain, more points to be requested<br />5/18/11<br />4<br />
  5. 5. Proof of concept #1<br />Requested points: 64x64 = 4096<br />Requested area: 256x256<br />5/18/11<br />5<br />
  6. 6. Proof of concept #2<br />Requested points: 32x32x32 = 32768<br />Requested area: 32x32x32<br />5/18/11<br />6<br />
  7. 7. Example: 2D vector map<br />256x256 = 65536 points on area of 1024x1024 points<br />Arbitrary time step<br />High resolution in contours, low resolution in quiver<br />Calculation time: ~1 min<br />5/18/11<br />7<br />
  8. 8. 5/18/11<br />8<br />
  9. 9. Example: 2D vector map close-ups<br />Four steps, zooming in to center of previous:<br />128x128 on 1024x1024 area<br />128x128 on 256x256 area<br />64x64 on 64x64 area<br />16x16 on 16x16 area<br />Emphasizes large and small-scale structures<br />Calculation time: ~ 1 min<br />5/18/11<br />9<br />
  10. 10. 5/18/11<br />10<br />
  11. 11. Example: 3D isovorticity<br />32x32x32 = 32768 points in same volume<br />Show vorticity structures in flow<br />Cubic interpolation: smoother result, better readable<br />Calculation time: ~15 sec<br />5/18/11<br />11<br />
  12. 12. 5/18/11<br />12<br />
  13. 13. Future<br />Q-value and Lambda-2 for vorticity<br />Statistics<br />Suggestions and ideas?<br />5/18/11<br />13<br />

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