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Fluid Mechanics Problems (fluid + mechanic_problem)

Distribution by Scientific Domains
Engineering75%

Selected Abstracts

Experimental study of a turbulent cross-flow near a two-dimensional rough wall with narrow apertures

AICHE JOURNAL, Issue 10 2008
Satya Mokamati
Abstract Turbulent flow over a rough wall with suction or blowing is a common fluid mechanics problem that has many practical applications including pulp screening. To better understand, the complex hydrodynamics at the critical region near the surface of the wall, the streamwise mean and velocity fluctuations were determined experimentally using laser Doppler velocietry. The near-wall streamwise velocity fluctuations and local mean streamwise velocity were shown to be a strong function of the surface roughness, and the aperture and cross-flow velocities. A correlation for the mean velocity and the wall shear stress acting near the wall was determined. © 2008 American Institute of Chemical Engineers AIChE J, 2008 [source]

The solution of fluid mechanics problems by probability methods

COMPUTER APPLICATIONS IN ENGINEERING EDUCATION, Issue 2 2005
Sergio E. Perez
Abstract This study shows how fluid mechanics problems may be solved using probability methods. Problems solved include velocity distributions in steady and unsteady flow between parallel plates as well as steady flow through a constant diameter three-dimensional duct. We find that the results approach exact solutions as the number of random walks increases, and that the complexity of the flow equations precludes extension of the technique to three dimensions. We also find that these techniques are much easier for students to put into practice than others. © 2005 Wiley Periodicals, Inc. Comput Appl Eng Educ 13: 133,136, 2005; Published online in Wiley InterScience (www.interscience.wiley.com); DOI 10.1002/cae.20038 [source]

Numerical simulations of viscous flows using a meshless method

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 7 2008
Changfu You
Abstract This paper uses the element-free Galerkin (EFG) method to simulate 2D, viscous, incompressible flows. The control equations are discretized with the standard Galerkin method in space and a fractional step finite element scheme in time. Regular background cells are used for the quadrature. Several classical fluid mechanics problems were analyzed including flow in a pipe, flow past a step and flow in a driven cavity. The flow field computed with the EFG method compared well with those calculated using the finite element method (FEM) and finite difference method. The simulations show that although EFG is more expensive computationally than FEM, it is capable of dealing with cases where the nodes are poorly distributed or even overlap with each other; hence, it may be used to resolve remeshing problems in direct numerical simulations. Flows around a cylinder for different Reynolds numbers are also simulated to study the flow patterns for various conditions and the drag and lift forces exerted by the fluid on the cylinder. These forces are calculated by integrating the pressure and shear forces over the cylinder surface. The results show how the drag and lift forces oscillate for high Reynolds numbers. The calculated Strouhal number agrees well with previous results. Copyright © 2008 John Wiley & Sons, Ltd. [source]