摘要:

This paper presents the finite element method for the analysis of the short wave problem expressed by the Boussinesq equation which considers the effect of wave crest curvature. The standard Galerkin finite element method is employed for the spatial discretization using the triangular finite element based on the linear interpolation function. The combination of the explicit and the quasi-explicit schemes, i.e. the explicit scheme for ihe continuum equation and the quasi-explicit scheme for the momentum equation, is employed for the discretization in time. To show the applicability of the present method for the practical problem, the simulation of wave propagation in one-dimensional and two-dimensional channel flows are carried out. The numerical results are in good agreement with the experimental results being performed previously, The practical example applied to Miyako Bay is presented.

ISSN:1061-8562    

DOI:10.1080/10618569408904481

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

For many practical fluid flow problems, such as those found in I.C. engines and bio-devices, part or all of the boundaries are moving in space. An accurate and conservative representation of moving boundaries is essential for any numerical method. In this paper, a finite volume method is described to solve unsteady three-dimensional fluid flow problems with moving boundaries. The computational grid is allowed to move arbitrarily and to conform to the boundary motion. The approach could be categorized as an arbitrary Lagrangian-Eulerian method and has been designed for use on a general non-orthogonal grid. An extra geometric constraint called Space Conservation Law, is introduced and numerically implemented in an accurate and general way. This space conservation law is combined together with other conservation laws and the whole system is solved with a pressure-based numerical method on a non-staggered grid. Examples are given to demonstrate the importance of a fully conservative and accurate implementation of the space conservation law and the consequences of not satisfying it. The proposed approach has been implemented in order to solve 2D or 3D flows in a body-fitted-coordinate system. Practical usability of the method is emphasized. Three sample applications, two 2D and one 3D, are used to demonstrate the approach. Results are compared favorably to analytical, experimental, and other numerical solutions.

ISSN:1061-8562    

DOI:10.1080/10618569408904482

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The physical modelling of the interaction of arc electric current with a high speed flow of gas in circuit-breakers is presented. The flow model is based on the Euler equations for compressible flow and an energy source term is added to represent the electric arc power input and the radiation transport. The discrete equations are formulated to include the motion of the boundaries and solved using an extension of Roe's scheme for moving grids. The related stability criteria is discussed and the algorithm is validated for a Rayleigh line flow. The simulation of a circuit-breaker operation is performed and the numerical results compared with experimental data.

ISSN:1061-8562    

DOI:10.1080/10618569408904483

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The prediction of laminar flow in a bifurcating plane duct is presented. For a range of Reynolds numbers from 50 to 1500 and mass flow ratios in the junction from zero to the inflow massflux, the flow pattern and several global values, like pressure-drops, friction factors etc., are predicted. The aim of this investigation is to point out the relation between the energy losses and the parameters varied, which is possible by applying a parallel blockstructured multigrid code, with which, due to the high numerical efficiency of the algorithm and parallel computing, accurate results in short computing times are achievable, and therefore a high resolution of parameter fields are possible.

ISSN:1061-8562    

DOI:10.1080/10618569408904484

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor