# Graduate Students Seminar

Location

Mathematics/Psychology : 106

Date & Time

October 9, 2024, 11:00 am – 11:50 am

Description

Session Chair: | Muhammad Jalil Ahmad |

Discussant: | Dr. Kvalheim |

###### Speaker 1: Ahmet Aydin

**Title***A Monolithic Solver for the Unsteady Navier-Stokes Equations***Abstract**- Consider the unsteady, time dependent, Navier-Stokes Equations which govern fluid dynamics. The spatial discretization is achieved using Taylor-Hood elements, where biquadratic basis functions are applied to the velocity components and bilinear basis functions to the pressure components. For time discretization, the unconditionally stable backward Euler method is employed. Rather than solving the system sequentially at each time step, the algebraic systems across all time steps are combined into a single monolithic system. The resulting system is solved using Picard iteration.

###### Speaker 2: Haoyu Ren

**Title***Literature review on nonparametric methods for doubly robust estimation of continuous treatment effects***Abstract**- Continuous treatments (e.g.doses) arise often in practice,but many available causal effect estimators are limited by either requiring parametric models for the effect curve, or by not allowing doubly robust covariate adjustment. We develop a novel kernel smoothing approach that requires only mild smoothness assumptions on the effect curve and still allows for misspec- ification of either the treatment density or outcome regression. We derive asymptotic properties and give a procedure for data-driven bandwidth selection. The methods are illustrated via sim- ulation and in a study of the effect of nurse staffing on hospital readmissions penalties.

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