[Alumnos-ii-cs] Coloquio Departamental, Martes 21 de Abril 12:00, F-106, CC y LPA, CSJ

[Claudio Torres]

Estimad at s, 

Este *Martes 21 de Abril a las 12:00* tendremos nuestro coloquio departamental en el Auditorio Claudio Matamoros, F-106, (La charla se transmitirá por videoconferencia al Laboratorio de Programación Avanzado, LPA, San Joaquín.). En esta ocasión *Roberto León, Ph.D. (c)* nos presentará su trabajo titulado: 
"A new parallel numerical model for multiple collisions". 

*Resumen:* 
The A-CD^2 method is used for numerical simulation in collisions of rigid bodies. This method solves a large scale constrained minimization problem in order to obtain the new velocities of each particle after a collision. The minimization problem is originally solved using the Uzawa method. Unfortunately, the Uzawa method converges very slowly. In order to overcome this shortcoming, we propose a new numerical model that improves the previous approach in three ways:
(i) the minimization problem is solved with a interior point method implemented in the CPLEX library, which converges in half of time required by the Uzawa method;
(ii) the new model includes the rotational dynamics of the free moving rigid bodies between collisions;
(iii) a parallel implementation of the updated velocities after collision is included.
This new approach allow us to obtain numerical simulations with a large number of solids that was not possible before. 

*Mini Bio:* 
Roberto León es candidato a Doctor en Ingeniería Informática de la Universidad Técnica Federico Santa María. Él es Ingeniero Civil Informático y Magíster en Ciencias de la Ingeniería Informática de la misma casa de estudios (2008). Actualmente se desempeña como académico de la Facultad de Ingeniería de la Universidad Andrés Bello. Su área de investigación es la computación científica, simulación numérica y computación de alto desempeño. 

¡Quedan todos cordialmente invitados! 

Cordiales Saludos, 

Comité de Coloquio

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