CGL Meeting Agenda

Date: April 9, 2015
Location: DC 1331
Time: 11:30
Chair: Ryan Goldade
Ryan Goldade

1. Acceptance of the Agenda - additions or deletions

2. Coffee Hour

Coffee hour last week:
I can't quite recall.- thanks!
Coffee hour this week:
Coffee hour next week:

3. Forthcoming

Date: April 16, 2015 April 23, 2015 April 30, 2015 May 7, 2015
Location: DC 1331 11:30 DC 1331 11:30 DC 1331 11:30 DC 1331 11:30
Chair: Craig Kaplan
Craig Kaplan
Marta Kryven
Marta Kryven
Egor Larionov
Egor Larionov
Mulong Li
Mulong Li
Technical Presentation: Christopher Batty
Christopher Batty
Dustin Biser
Dustin Biser
Bill Cowan
Bill Cowan
Ryan Goldade
Ryan Goldade

4. Technical Presentation

Vinicius Azevedo

Vinicius Azevedo
Title : A Topology-Preserving Fluid Solver for Obstacles with Thin Features and Narrow Gaps
Standard grid-based fluid animation methods have long struggled to resolve flows involving narrow gaps and thin boundary features. Past approaches have artificially inflated or voxelized thin object boundaries, but this sacrifices the correct geometry and topology of the fluid domain and prevents flow through narrow regions. We present a boundary-respecting fluid simulator that overcomes these challenges. Our solution is to clip the solid boundary against the cells of a regular grid to generate a topologically correct, boundary-conforming cut-cell mesh. We extend both velocity advection and pressure projection to support this enhanced mesh structure. We introduce a modified FLIP advection scheme to avoid the need to reinitialize invalid cells swept over by moving boundaries, and use polyhedral interpolation to improve the degree to which the flow conforms to irregular and possibly non-convex cell boundaries. We also introduce a graph-based topology-aware pressure projection that preserves incompressibility even in thin regions and yields symmetric positive definite linear systems. Moreover, it is straightforward to implement and consistent with existing second-order schemes for volumetric solid boundaries. Our results enable successful one-way solid-fluid coupling in the presence of thin objects and narrow flow regions even on coarse grids.

5. Discussion Items

6. Action Items

7. Lab Events

8. Conferences and Special Journal Issues

Recent Additions

Upcoming Deadlines

9. Directors' Meeting

10. Seminars and Events

Friday, 10 April 2015, 11:30AM - Computer Science (Human-Computer Interaction), DC 2585
Adam Fourney: -- Exploring Time-Dependent Concerns about Pregnancy and Childbirth from Search Logs
Wednesday, 15 April 2015, 10:00AM - Computer Science (Cryptography, Security, and Privacy (CrySP) Group), DC 2310
Yihang Song: -- PrivacyGuard : A VPN-based approach to detect privacy leakages on Android devices
Wednesday, 15 April 2015, 11:00AM - Computer Science (Software Engineering Research Group), DC 2310
Devin Choliak: -- Software Bug Detection Using the N-gram Language Model
Wednesday, 15 April 2015, 3:00PM - Computer Science (Cryptography, Security, and Privacy (CrySP) Group), DC 2310
Chuan Guo: -- Frameproof Codes and Related Combinatorial Structures

Also see other Math and CS postings.

10. Lab Cleanup

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