MEETING-DATE:April 9, 2015
MEETING-LOCATION:DC 1331
MEETING-TIME:11:30
MEETING-CHAIR:Ryan Goldade
MEETING-CHAIRPIC:deckchair.jpg
COFFEE-HOUR-LAST-WEEK:I can't quite recall.
COFFEE-HOUR-THIS-WEEK:Volunteers?
COFFEE-HOUR-NEXT-WEEK:Volunteers?
FORTH-DATE1:April 16, 2015
FORTH-DATE2:April 23, 2015
FORTH-DATE3:April 30, 2015
FORTH-DATE4:May 7, 2015
FORTH-LOCATION1:DC 1331 11:30
FORTH-LOCATION2:DC 1331 11:30
FORTH-LOCATION3:DC 1331 11:30
FORTH-LOCATION4:DC 1331 11:30
FORTH-CHAIR1:Craig Kaplan
FORTH-CHAIR2:Marta Kryven
FORTH-CHAIR3:Egor Larionov
FORTH-CHAIR4:Mulong Li
FORTH-CHAIRPIC1:craig.jpg
FORTH-CHAIRPIC2:marta.jpg
FORTH-CHAIRPIC3:egor.jpg
FORTH-CHAIRPIC4:nohs.gif
FORTH-TP1:Christopher Batty
FORTH-TP2:Dustin Biser
FORTH-TP3:Bill Cowan
FORTH-TP4:Ryan Goldade
FORTH-TPPIC1:batty.jpg
FORTH-TPPIC2:dustin_biser.png
FORTH-TPPIC3:cowan_unflipped.gif
FORTH-TPPIC4:tjlahey.gif
TPNAME:Vinicius Azevedo
TPTITLE:A Topology-Preserving Fluid Solver for Obstacles with Thin Features and Narrow Gaps
TPABSTRACT: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.
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SEMINARS:<DT><A HREF="https://www.math.uwaterloo.ca/~wnotice/notice_prgms/wreg/list_full.pl?20150310-1130.2878">Friday, 10 April 2015</A>, 11:30AM - Computer Science  (<em>Human-Computer Interaction</em>), DC 2585 </dt><nl><DD> Adam Fourney: -- <EM> Exploring Time-Dependent Concerns about Pregnancy and Childbirth from Search Logs </EM></dd><nl><nl><DT><A HREF="https://www.math.uwaterloo.ca/~wnotice/notice_prgms/wreg/list_full.pl?20150315-1000.20632">Wednesday, 15 April 2015</A>, 10:00AM - Computer Science  (<em>Cryptography, Security, and Privacy (CrySP) Group</em>), DC 2310</dt><nl><DD> Yihang Song: -- <EM> PrivacyGuard : A VPN-based approach to detect privacy  leakages on Android devices </EM> </dd><nl><nl><DT><A HREF="https://www.math.uwaterloo.ca/~wnotice/notice_prgms/wreg/list_full.pl?20150315-1100.2119">Wednesday, 15 April 2015</A>, 11:00AM - Computer Science  (<em>Software Engineering Research Group</em>), DC 2310 </dt><nl><DD> Devin Choliak: -- <EM> Software Bug Detection Using the N-gram Language Model </EM> </dd><nl><nl><DT><A HREF="https://www.math.uwaterloo.ca/~wnotice/notice_prgms/wreg/list_full.pl?20150315-1500.13002">Wednesday, 15 April 2015</A>, 3:00PM - Computer Science  (<em>Cryptography, Security, and Privacy (CrySP) Group</em>), DC 2310 </dt><nl><DD> Chuan Guo: -- <EM> Frameproof Codes and Related Combinatorial Structures </EM></dd></dl>