Lucas Monteiro Nogueira 
In this fluid mechanics/transport phenomena blog post, we present a simplified approach to internal flows driven by unsteady, pulsatile pressure gradients. We develop an analytical Bessel function-based velocity profile and discuss special cases based on the Womersley number.
1. Introduction In the jargon of hydrodynamic transport phenomena, a ‘shock’ is a discontinuity separating two different regions in an otherwise continuous medium (Kallenrode, 2004). It is associated with a disturbance moving faster than the rate of signal propagation in the environment, such as an airplane traveling at a speed greater than the speed of […]
1. Yield Surfaces Plasticity theory is the study of structural strains beyond the linear region in which deformations are elastic and Hooke’s law describes mechanical behavior. The existence of a fixed region of admissible generalized stresses is a key concept in this field. When modelling elastic-plastic behavior, it is assumed that at all times, the […]
In this economics/mathematics blog post, we discuss two basic solution concepts of cooperative game theory: the core and the Shapley value. A calculation example is included.
In this transportation/railway engineering blog post we discuss ballast fouling, a rail performance issue that each year costs millions of dollars for repair and maintenance in tracks all over the world.
In this hydraulics/hydrology/hydrogeology blog post, we discuss two simple models used to assess aquifer drawdown due to groundwater flow in confined and semiconfined wells.
In this chemical engineering/energy engineering blog post, we discuss biomass gasification, an energy conversion technique that can be used to produce hydrogen gas and other valuable chemicals.
In this energy studies/aerodynamics/aerospace blog post, we discuss vertical-axis wind turbines (VAWTs), an underrated renewable energy solution that has recently drawn the interest of the research community.
In this optics blog post, we explore Huygens-Fresnel diffraction and related concepts, such as Fresnel zones, Fresnel integrals, and the Cornu spiral.
In this blog post, we discuss two simple heat transfer-based models for determination of the freezing time of foods. Two solved example problems are included.
