Science

Flow Science and Engineering at Johns Hopkins University brings together experts in fluid dynamics, turbulence, CFD, multiphase flow, aerospace engineering, and naval engineering from the Whiting School of Engineering, the Applied Physics Laboratory, and nearby institutions. Their research, funded by NASA, ONR, and other agencies, focuses on advancing fluid flow technologies for aerospace, energy, and … Read more

Plane Poiseuille flow refers to the laminar flow of a Newtonian fluid through a cylindrical pipe with a constant pressure gradient. It’s characterized by the Poiseuille number, Reynolds number, and Dean number, which account for viscous forces, inertia, and centrifugal effects. Poiseuille’s law quantifies the volumetric flow rate as a function of fluid viscosity, pipe … Read more

Equation of streamline describes the mathematical curve that represents the trajectory of fluid particles. It involves the concept of closeness, indicating the proximity of a particle to the streamline. Streamlines are defined as curves that are tangent to the velocity vector field at every point, indicating the direction of fluid flow. By analyzing the equation … Read more

Eddy dissipation rate (ε) quantifies the intensity of turbulence by measuring the rate at which kinetic energy is converted into thermal energy at the smallest scales of turbulence. This energy dissipation occurs due to viscous forces acting on the smallest eddies, leading to the transfer of energy from larger scales to smaller scales until it … Read more

Turbulence kinetic energy (TKE) is a measure of the kinetic energy associated with the fluctuating velocity components in a turbulent flow. It represents the energy contained within the eddies and is crucial for understanding the dynamics and behavior of turbulent flows. TKE can be used to characterize the intensity and scale of turbulence and is … Read more

Turbulent Channel Flow Near Wall Velocity Profile Turbulent flow in a channel exhibits a distinct velocity profile near the wall, characterized by a logarithmic region where velocity increases logarithmically with distance from the wall. This logarithmic layer is bounded by the viscous sublayer near the wall, where viscous forces dominate, and the buffer layer, a … Read more

The ASME Pressure Vessel Code PDF is a comprehensive resource for professionals in the pressure vessel industry. It outlines the requirements and standards for the design, construction, inspection, and maintenance of pressure vessels. This code is essential for ensuring the safety and reliability of pressure vessels, and it is widely used in industries such as … Read more

Enforcing flow tangency conditions in convex optimization ensures that the flow in power systems is feasible and meets physical constraints. To achieve this, the flow tangency constraint is introduced as an additional constraint in the problem formulation. By incorporating this constraint into the optimization model, the solution obtained satisfies the specific flow tangency requirements, ensuring … Read more

“Turbulence Forecast Atlantic” provides comprehensive information regarding turbulence detection and forecasting, emphasizing its significance for aviation safety. The report explores contributions from government agencies like NOAA and FAA, research institutions such as NCAR and UCAR, and international organizations including WMO and ICAO. It also highlights the services offered by commercial providers like the Turbulence Forecasting … Read more

Detached Eddy Simulation (DES) is a hybrid turbulence model that blends Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) approaches. DES uses RANS in regions of attached flow, where the turbulence is more predictable, and switches to LES in regions of detached flow, where the eddies become larger and more energetic. This hybrid approach allows … Read more

Ultrasensitive and highly specific lateral flow devices provide rapid, on-site detection of target analytes. Their simplicity, cost-effectiveness, and portability make them ideal for point-of-care diagnostics, environmental monitoring, and food safety. These devices utilize advanced materials and innovative detection mechanisms to achieve high sensitivity and specificity, enabling the detection of analytes present in low concentrations. Briefly … Read more

Material flow analysis studies the flows of materials and substances through industrial systems, identifying sources, sinks, and transformations. It defines systems and boundaries to analyze processes and activities such as extraction, production, consumption, and disposal. Stakeholder involvement is crucial to consider different perspectives. Essential tools include material flow models, life cycle inventory analysis, and process … Read more