Abhinav Golas



My current research is focused on using fluid simulation techniques to model large aggregates like granular materials, crowds etc.


Free-Flowing Granular Materials with Two-Way Solid Coupling
Rahul Narain, Abhinav Golas, Ming Lin
Proceedings of ACM SIGGRAPH Asia 2010 (To appear)

We present a novel continuum-based model that enables efficient simulation of granular materials.Our approach fully solves the internal pressure and frictional stresses in a granular material, thereby allows visually noticeable behaviors of granular materials to be reproduced, including freely dispersing splashes without cohesion, and a global coupling between friction and pressure.The full treatment of internal forces in the material also enables two-way interaction with solid bodies.Our method achieves these results at only a very small fraction of computational costs of the comparable particle-based models for granular flows.

Aggregate Dynamics for Dense Crowd Simulation
Rahul Narain, Abhinav Golas, Sean Curtis, Ming Lin
Proceedings of ACM SIGGRAPH Asia 2009

Large dense crowds show aggregate behavior with reduced individual freedom of movement. We present a novel, scalable approach for simulating such crowds, using a dual representation both as discrete agents and as a single continuous system. In the continuous setting, we introduce a novel variational constraint called unilateral incompressibility, to model the large-scale behavior of the crowd, and accelerate inter-agent collision avoidance in dense scenarios. This approach makes it possible to simulate very large, dense crowds composed of up to a hundred thousand agents at near interactive rates on desktop computers.

Interactive Modeling, Simulation and Control of Large-Scale Crowds and Traffic
Ming Lin, Stephen Guy, Rahul Narain, Jason Sewall, Sachin Patil, Jatin Chhugani, Abhinav Golas, Jur van den Berg, Sean Curtis, David Wilkie, Paul Merrell, Changkyu Kim, Nadathur Satish, Pradeep Dubey, Dinesh Manocha
Motion in Games 2009

Explosion Simulation using Compressible Fluids
Abhinav Golas, Akram Khan, Prem Kalra, Subodh Kumar
Proceedings of ICVGIP 2008

We propose a novel physically based method to simulate explosions and other compressible fluid phenomena. The method uses compressible Navier Stokes equations for modeling the explosion with a Semi-Lagrangian integration method. The proposed integration method addresses the issues of stability and larger time steps. This is achieved by modifying the Semi-Lagrangian method to reduce dissipation and increase accuracy, using improved interpolation and an error correction method. The proposed method allows the rendering of related phenomena like a fireball, dust and smoke clouds, and the simulation of solid interaction - like rigid fracture and rigid body simulation. Our method is flexible enough to afford substantial artistic control over the behavior of the explosion.