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Transcript of Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of...
![Page 1: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/1.jpg)
http://cs.swan.ac.uk/
The Search for Swirl and Tumble Motion
Robert S. LarameeDepartment of Computer Science
Swansea University
Wales, UK
![Page 2: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/2.jpg)
2 The Search for Swirl and Tumble Motion
Robert S. [email protected]
Outline Problem description: swirl and tumble motion Flow visualization classification:
direct geometric texture-based feature-based
The great search 2D 2.5D (surfaces) 3D steady and unsteady flow
Summary and conclusions
![Page 3: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/3.jpg)
3 The Search for Swirl and Tumble Motion
Robert S. [email protected]
Swirl and Tumble Motion swirl motion:
characterized by motion about cylinder-aligned axis
more stable (easier)
tumble motion: characterized by motion about axis orthogonal to cylinder
unstable, more difficult
![Page 4: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/4.jpg)
4 The Search for Swirl and Tumble Motion
Robert S. [email protected]
Swirl and Tumble MotionAchieving ideal patterns of motion leads to optimal
mixing (of air and fuel) conditions e.g., higher exhaust/gas ratio (EGR) decrease in fuel consumption lower emissions
1. Can visualization provide insight into or verify characteristic shape/behavior of flow?
2. What tools help to visualize swirl/tumble motion?3. Where (in the combustion chamber) are ideal
ideal flow pattern not being realized?
![Page 5: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/5.jpg)
5 The Search for Swirl and Tumble Motion
Robert S. [email protected]
Flow Visualization Classification1. direct: overview of vector
field, minimal computation, e.g. glyphs, color map
2. texture-based: complete coverage, more computation time, implementation time, e.g., Spot Noise, LIC
3. geometric: compute a discrete object whose geometry reflects flow characteristics, e.g. streamlines
4. feature-based: interesting subsets of the flow are first extracted
![Page 6: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/6.jpg)
6 The Search for Swirl and Tumble Motion
Robert S. [email protected]
The Great SearchGeometric Texture-
basedFeature-based
2D
2.5D
3D & hybrid
Both steady and unsteady flow!
![Page 7: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/7.jpg)
7 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2D Slices, Geometric Flow Visualization
3D streamlets for visualization of swirl motion:
Coverage is incomplete
Seeding an issue
Resampling used
swirl motion good, although
off-center
![Page 8: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/8.jpg)
8 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2D Slices, Geometric Flow Visualization
Streamlines and tumble motion
Implemented via dye injection:
Coverage incomplete
Some flow features highlighted
Applicable to 3D Downstream
direction shown
non-ideal tumble motion, saddle
point
![Page 9: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/9.jpg)
9 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2D Slices, Texture-Based Flow VisualizationTexture-based flow
visualization and swirl motion:
Image-Based Flow Visualization (IBFV) [Van Wijk 02]
Complete coverage Flow features shown Hard to apply in 3D downstream direction
shown
swirl behaviour evident
![Page 10: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/10.jpg)
10 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2D Slices, Texture-Based Flow Visualization
Texture-based flow visualization and tumble motion:
Complete coverage Flow features shown Difficult to apply to 3D Downstream direction
shown
tumble behavior non-ideal
![Page 11: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/11.jpg)
11 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2.5D, Geometric Flow VisualizationDye injection on
surface (tumble motion):
Incomplete coverage Flow features depend
on seeding Applies to 3D Downstream direction
shown
tumble motion: separatrix
highlighted
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12 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2.5D, Geometric Flow VisualizationTimelines on surface: Incomplete coverage Flow features depend
on seeding Applicable to 3D Downstream direction
shown in animation
tumble motion: divergent and
convergent areas of the flow highlighted
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13 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2.5D, Texture-Based Flow Visualization
Texture-based approach at surface:
Image Space Advection (ISA) [Laramee et al. 04]
Complete coverage Flow features visible Difficult to apply in 3D Downstream direction
shown
swirl motion: generally good at surface (w/
exceptions)
![Page 14: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/14.jpg)
14 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2.5D, Texture-Based Flow Visualization
Texture-based approach on surface:
ISA Complete coverage Flow features visible Difficult to apply in 3D Downstream direction
shown
tumble motion: rotation off-center?
saddle point shown
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15 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D & Hybrid, Geometric Flow Visualization
3D streamlines Incomplete coverage Flow features
depend on seeding Appropriate for 3D Downstream
direction sometimes shown
swirl motion: (generally)
prevalent inside combustion
chamber
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16 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D & Hybrid, Geometric and Texture-Based Flow Visualization
Geometric and texture-based flow visualization on isosurfaces
Incomplete coverage Flow features depend on
placement Appropriate for 3D Downstream direction
shown
swirl motion: prevalent inside combustion
chamber, non-ideal motion also prevalant
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17 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D & Hybrid, Geometric and Texture-Based Flow Visualization
Geometric and texture-based flow visualization on isosurfaces
Incomplete coverage Features shown depend on
placement Applicable to 3D Downstream direction
shown
tumble motion: axis of rotation is off center,
cross between two ideals
![Page 18: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/18.jpg)
18 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2.5D Feature-Based Flow Visualization
2.5D Feature-Based Swirl Visualization
Topological skeleton of flow is extracted explicitly
Features shown automatically
Applicable to 3D Complete coverage Downstream direction not
shown
swirl motion: very complex
near top of chamber
red = saddle
blue = sink
green = source
![Page 19: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/19.jpg)
19 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Unsteady Geometric Flow Visualization
3D, Unsteady Geometric Tumble Visualization
Pathlets seeded at inlet Features depend on
seeding Applicable to 3D Incomplete coverage Downstream direction
shown
tumble motion: difficult to
observe
![Page 20: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/20.jpg)
20 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Feature-Based Flow Visualization
3D, Feature-Based Swirl Visualization
Boundary topology + 3D vortex core lines
Features extracted automatically
Applicable to 3D Incomplete coverage Downstream direction not
shown
Swirl motion: candidate
swirl axis off-center
red = saddle
blue = sink
green = source
![Page 21: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/21.jpg)
21 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Unsteady Feature-Based Flow Visualization
3D, Unsteady Feature-Based Tumble Visualization
Boundary topology extracted + 3D vortex core lines
Features extracted automatically Applicable to 3D Incomplete coverage Downstream direction not shown
tumble motion: very transient
red = saddle
blue = sink
green = source
![Page 22: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/22.jpg)
22 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Feature-Based Flow Visualization
3D, Feature-Based Swirl Visualization
Boundary topology + 3D vortex core regions-lamda 2 transfer function
Features extracted automatically, resampling necessary
Applicable to 3D Incomplete coverage Downstream direction not shown
Swirl motion: candidate
swirl axis off-center
red = saddle
blue = sink
green = source
![Page 23: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/23.jpg)
23 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Unsteady Feature-Based Flow Visualization
3D, Unsteady Feature-Based Tumble Visualization
Boundary topology extracted + 3D vortex core regions –lambda 2 transfer function
Features extracted automatically, resampling necessary
Applicable to 3D Incomplete coverage Downstream direction not shown
tumble motion: complex!
candidate axis is revealed
red = saddle
blue = sink
green = source
![Page 24: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/24.jpg)
24 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Unsteady Feature-Based Flow Visualization
Tumble Visualization-more difficult to visualize
Volume rendering of 3D vortex core regions –lambda 2 + helicity
Features extracted automatically, resampling necessary
Applicable to 3D Incomplete coverage Downstream direction not shown
tumble motion: candidate axis is
more clearly revealed
![Page 25: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/25.jpg)
25 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Unsteady Feature-Based Flow Visualization
Tumble Motion and Hybrid Visualizations
Volume rendering of 3D vortex core regions –lambda 2 in combination with particles
Features extracted automatically, resampling necessary
Applicable to 3D Incomplete coverage Downstream direction shown
tumble motion: very transient, most effective up to
this point
![Page 26: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/26.jpg)
26 The Search for Swirl and Tumble Motion
Robert S. [email protected]
3D, Unsteady Feature-Based Flow Visualization
Tumble Motion and Hybrid Visualizations
3D vortex core lines in combination with particles
Features extracted automatically Applicable to 3D Incomplete coverage Downstream direction shown
tumble motion: very transient, most effective up to
this point
![Page 27: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/27.jpg)
27 The Search for Swirl and Tumble Motion
Robert S. [email protected]
2.5D, Feature-Based Flow Visualization
Tumble Motion and Periodic Orbit Extraction
Automatic periodic orbit extraction
Applicable to 3D Incomplete coverage Downstream direction shown (in
animation)
tumble motion: extracted directly,
questions with interpretation
![Page 28: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/28.jpg)
28 The Search for Swirl and Tumble Motion
Robert S. [email protected]
Summary and Conclusions We have presented the most
comprehensive search for swirl and tumble motion ever…
The search continues! Future feature-based flow visualization
techniques need to be able to extract user-defined features directly, in 3D, and be applicable to unsteady flow
![Page 29: Http://cs.swan.ac.uk/ The Search for Swirl and Tumble Motion Robert S. Laramee Department of Computer Science Swansea University Wales, UK.](https://reader035.fdocuments.us/reader035/viewer/2022062315/5697bfac1a28abf838c9b4f0/html5/thumbnails/29.jpg)
29 The Search for Swirl and Tumble Motion
Robert S. [email protected]
AcknowledgementsThanks to the following people:
Guoning ChenChristoph GarthHans HagenHelwig HauserKonstantin MischaikowJuergen SchneiderXavier TricocheDaniel WeiskopfEugene Zhang
Thank you for your attention!Questions?