✦ LIBER ✦

Numerical simulation of the ground effect using the boundary element method

✍ Scribed by Katsuhiro Kikuchi; Fuminori Motoe; Mitsunori Yanagizawa

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 455 KB
Volume: 25
Category: Article
ISSN: 0271-2091
DOI: 10.1002/(sici)1097-0363(19971115)25:9<1043::aid-fld604>3.0.co;2-z

No coin nor oath required. For personal study only.

✦ Synopsis

As is well known, the lift of a wing passing over the ground becomes larger than that of a wing in a ®nite air ®eld because of the ground effect. Owing to its special aerodynamic characteristics and applications, the problem of the ground effect has become increasingly common. In this paper some investigations were conducted to calculate the unsteady aerodynamic forces for long and short ground plates by means of boundary element techniques. In order to calculate the pressure variation on a long ground plate, the steady boundary element method was used. However, when using a short ground plate, the boundary element method was modi®ed to treat the unsteady aerodynamic phenomena. Experimental studies were also made for both ground plates to con®rm the validity of the numerical results. At low angles of attack the qualitative behaviour of the unsteady aerodynamic pressure on both ground plates was well predicted by the boundary element methods and qualitative agreement is found between the calculated and measured results.

📜 SIMILAR VOLUMES

Numerical simulations of impacts using a

Numerical simulations of impacts using a discrete element method

✍ S. A. Magnier; F. V. Donzé 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 287 KB 👁 1 views

Impacts of rigid spherical nose shaped missiles on concrete beams are simulated with a discrete element method. The history of the structural damage of the beam is followed from the very first crushing and fracturing processes to the ultimate fragmentation step. Spalling, scabbing, penetration and p

NUMERICAL SIMULATION OF SHALLOW WATER WA

NUMERICAL SIMULATION OF SHALLOW WATER WAVE PROPAGATION USING A BOUNDARY ELEMENT WAVE EQUATION MODEL

✍ N. Benmansour; D. Ouazar; L. C. Wrobel 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 187 KB 👁 1 views

The present paper makes use of a wave equation formulation of the primitive shallow water equations to simulate one-dimensional free surface flow. A numerical formulation of the boundary element method is then developed to solve the wave continuity equation using a time-dependent fundamental solutio

CONTINUITY AND COLLOCATION EFFECTS IN TH

CONTINUITY AND COLLOCATION EFFECTS IN THE BOUNDARY ELEMENT METHOD

✍ BRUCE A. AMMONS; MADHUKAR VABLE 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 225 KB 👁 1 views

The presence of singularities in the integral operators of the boundary element methods requires that the density functions must satisfy certain continuity requirements if the displacements and stresses are to be bounded. Quite often the continuity conditions, particularly on the derivatives of the

Numerical dispersion in the finite-eleme

Numerical dispersion in the finite-element method using three-dimensional edge elements

✍ Gregory S. Warren; Waymond R. Scott Jr. 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 281 KB 👁 2 views

w x Figure 8 Results obtained in 7 for the Gaussian beam propagation through the left arm of a nonlinear directional coupler. Reprinted with permission of the OSA and the authors. when analyzing nonlinear devices, which can lead to an 80% reduction of the computational time with respect to the stan

A numerical simulation of hydrodynamic f

A numerical simulation of hydrodynamic forces of ground-effect problem using Lagrange's equation of motion

✍ Shih-An Yang; Pan-An Luh 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 363 KB 👁 1 views

On the basis of the potential flow theory, Lagrange's equation of motion is used to study the unsteady ground-effect problem. The forces and moments acting on the moving body are solved in terms of the derivatives of added masses in which the generalized Taylor's formulae are applied. The singular i

Estimation of boundary conditions for gr

Estimation of boundary conditions for ground temperature control using Kalman filter and finite element method

✍ Keiichi Suma; Mutsuto Kawahara 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 359 KB 👁 1 views

This paper presents a numerical method in which the Kalman filter and the extended Kalman filter techniques are applied to the ground temperature control analysis with the finite element method. The purpose of this research is to identify the unknown parameters that are involved in the physical mode