Results 31 to 40 of about 132 (125)

The exterior non-stationary problem for the Navier-Stokes equations in regions with moving boundaries

Journal of the Mathematical Society of Japan, 1990
This paper is concerned with an initial-boundary value problem for the Navier-Stokes equations of incompressible viscous flow in a three- dimensional exterior domain with time-dependent boundary. More precisely, the equations are studied in a noncylindrical region \(\Omega_ T= {\displaystyle {\bigcup_{0\leq t\leq T}}} \Omega(t) \times\{t\}\), where \(T>
openaire   +4 more sources

A Green's Function Wind Turbine Induction Model That Incorporates Complex Inflow Conditions

Wind Energy, Volume 27, Issue 12, Page 1526-1544, December 2024.
ABSTRACT In this work, we develop a new analytical turbine induction model that can incorporate complex inflow conditions including cases where the wind velocity and temperature profiles can vary as functions of height. This induction model is derived from the linearized Navier–Stokes and leads to a second‐order ODE that can be solved using a Green's ...
Lawrence Cheung, Kenneth Brown, Philip Sakievich, Nathaniel deVelder, Thomas Herges, Daniel Houck, Alan Hsieh   +6 more
wiley   +1 more source

Identification of the vortex in the main flow passage of a multiphase pump and the relationship with pressure fluctuation

Energy Science &Engineering, Volume 12, Issue 10, Page 4394-4413, October 2024.
This study develops a method of identifying vortices in the impeller channel of the multiphase pump, and reveals the intrinsic connection between the vortices and pressure fluctuations in the main flow passage. These findings offer some suggestions for eliminating the influence of vortices and enhancing the pressurizing capabilities of multiphase pumps.
Guangtai Shi, Manqi Tang, Wenjuan Lv, Xiaodong Peng, Hui Quan   +4 more
wiley   +1 more source

Improving the Fuel Economy and Energy Efficiency of Train Cab Climate Systems, Considering Air Recirculation Modes

Energies
Current developments in vehicles have generated great interest in the research and optimization of heating, ventilation, and air conditioning (HVAC) systems as a factor to reduce fuel consumption.
Ivan Panfilov, Alexey N. Beskopylny, Besarion Meskhi   +2 more
doaj   +1 more source

Calibration of a hybrid sea ice model during an expedition to the Arctic

Proceedings in Applied Mathematics and Mechanics, Volume 24, Issue 3, October 2024.
Abstract We describe the acquisition and evaluation of data during the ArcWatch II expedition into the Arctic Ocean on board of the icebreaker Polarstern. The data is used to calibrate a hybrid sea ice model that focuses on modeling the marginal ice zone, which is the transition zone between pack ice and the open ocean.
Carolin Mehlmann, Thomas Richter
wiley   +1 more source

Two‐phase magma flow with phase exchange: Part II. 1.5D numerical simulations of a volcanic conduit

Studies in Applied Mathematics, Volume 153, Issue 3, October 2024.
Abstract In a review paper in this same volume, we present the state of the art on modeling of compressible viscous flows ranging from single‐phase to two‐phase systems. It focuses on mathematical properties related to weak stability because they are important for numerical resolution and on the homogenization process that leads from a microscopic ...
Alain Burgisser, Marielle Collombet, Gladys Narbona‐Reina, Didier Bresch   +3 more
wiley   +1 more source

Urban wind field prediction based on sparse sensors and physics‐informed graph‐assisted auto‐encoder

Computer-Aided Civil and Infrastructure Engineering, Volume 39, Issue 10, Page 1409-1430, 15 May 2024.
Abstract The urban flow wind field is a critical element for downstream research, such as mitigation of urban wind disasters, assessment of urban wind environment, and urban drone route planning. However, it is impractical to arrange a large number of sensors to monitor an urban wind flow field.
Huanxiang Gao, Gang Hu, Dongqin Zhang, Wenjun Jiang, K. T. Tse, K. C. S. Kwok, Ahsan Kareem   +6 more
wiley   +1 more source

Simulating the Unsteady Stable Boundary Layer With a Stochastic Stability Equation

Journal of Geophysical Research: Atmospheres, Volume 129, Issue 5, 16 March 2024.
Abstract Turbulence in very stable boundary layers is typically unsteady and intermittent. The study implements a stochastic modeling approach to represent unsteady mixing possibly associated with intermittency of turbulence and with unresolved fluid motions such as dirty waves or drainage flows.
Vyacheslav Boyko, Nikki Vercauteren
wiley   +1 more source

Numerical Aeroacoustic Assessment of a Metacontinuum Device Impinged by a Laser‐Generated Sound Source

Journal of Engineering, Volume 2024, Issue 1, 2024.
Significant research efforts have been conducted by many research groups in the last decades to circumvent the acoustic metamaterial concept limitations. Principally, the lack of a reliable methodology for the design of such metamaterial‐based devices and their performance decay when they operate in a moving medium were the main topics of investigation
Giada Colombo, Giorgio Palma, Umberto Iemma, Swastik Pradhan   +3 more
wiley   +1 more source

Investigation of Helicopter Blade Tip Configuration during Hover Flight Employing Computational Fluid Dynamics

Modelling and Simulation in Engineering, Volume 2024, Issue 1, 2024.
Our research focused on investigating the influence of rotor blade tip geometry on the aerodynamic performance of helicopters during hover flight, with the goal of enhancing overall efficiency. Through computational fluid dynamics (CFD) analysis using the Bell 212 helicopter configuration, we evaluated four different blade tip geometries: rectangular ...
Soufiane Stouti, Assel Thami Lahlou, Ismail Lagrat, Hamid Mounir, Oussama Bouazaoui, Vijayanandh Raja   +5 more
wiley   +1 more source