Meeting Agenda

Date:	July 6, 2017
Location:	DC 1331
Time:	1:30
Chair:	Christopher Batty

1. Acceptance of the Agenda - additions or deletions

2. Coffee Hour

Coffee hour last week:: Volunteers?
Coffee hour this week:: Volunteers?
Coffee hour next week:: Volunteers?

3. Forthcoming

Date:	July 13, 2017	July 13, 2017	July 27, 2017	August 3, 2017
Location:	DC 1331 1:30	DC 1331 1:30	DC 1331 1:30	DC 1331 1:30
Chair:	JC Change	Bill Cowan	Terence Dickson	Xiang Fang
Technical Presentation:	Christopher Batty	JC Change	Bill Cowan	Terence Dickson

4. Technical Presentation

Omar Zarifi	Title : A Positive-Definite Cut-Cell Method for Strong Two-Way Coupling Between Fluids and Deformable Bodies Abstract: We present a new approach to simulation of two-way coupling between inviscid free surface fluids and deformable bodies that exhibits several notable advantages over previous techniques. By fully incorporating the dynamics of the solid into pressure projection, we simultaneously handle fluid incompressibility and solid elasticity and damping. Thanks to this strong coupling, our method does not suffer from instability, even in very taxing scenarios. Furthermore, use of a cut-cell discretization methodology allows us to accurately apply proper free-slip boundary conditions at the exact solid-fluid interface. Consequently, our method is capable of correctly simulating inviscid tangential flow, devoid of grid artefacts or artificial sticking. Lastly, we present an efficient algebraic transformation to convert the indefinite coupled pressure projection system into a positive-definite form. We demonstrate the efficacy of our proposed method by simulating several interesting scenarios, including a light bath toy colliding with a collapsing column of water, liquid being dropped onto a deformable platform, and a partially liquid-filled deformable elastic sphere bouncing.

Omar Zarifi

Title : A Positive-Definite Cut-Cell Method for Strong Two-Way Coupling Between Fluids and Deformable Bodies
Abstract:
We present a new approach to simulation of two-way coupling between inviscid free surface fluids and deformable bodies that exhibits several notable advantages over previous techniques. By fully incorporating the dynamics of the solid into pressure projection, we simultaneously handle fluid incompressibility and solid elasticity and damping. Thanks to this strong coupling, our method does not suffer from instability, even in very taxing scenarios. Furthermore, use of a cut-cell discretization methodology allows us to accurately apply proper free-slip boundary conditions at the exact solid-fluid interface. Consequently, our method is capable of correctly simulating inviscid tangential flow, devoid of grid artefacts or artificial sticking. Lastly, we present an efficient algebraic transformation to convert the indefinite coupled pressure projection system into a positive-definite form. We demonstrate the efficacy of our proposed method by simulating several interesting scenarios, including a light bath toy colliding with a collapsing column of water, liquid being dropped onto a deformable platform, and a partially liquid-filled deformable elastic sphere bouncing.

5. Discussion Items

6. Action Items

Remove Sean Davis from list of lab members

7. Lab Events

8. Conferences and Special Journal Issues

Recent Additions

Upcoming Deadlines

9. Directors' Meeting

10. Seminars and Events

Friday, 7 July 2017, 10:30AM - Computer Science , DC 1304 [New!]

Mostafa Ammar: -- The Cirrus Cloud Project: Opportunistic Mobile Cloud Computing

Friday, 7 July 2017, 10:30AM - Computer Science (Human-Computer Interaction), DC 2310 [Newish]

Laton Vermette: -- Design and Evaluation of Social CheatSheet: A Community-Curated Software Help Overlay

Friday, 7 July 2017, 11:00AM - Computer Science (Artificial Intelligence Lab), DC 1331 [Newish]

Bowen Hui: -- AI in a Personalized Learning Environment

Thursday, 13 July 2017, 10:30AM - Applied Mathematics , MC 6460

Justin Shaw: -- A Simple Example of Dimension Reduction

Also see other Math and CS postings.