Asymmetric fluid flow in a hemispherical container induced by electromagnetic forces

Summary The flow of incompressible fluid in a hemispherical container induced by a distributed source of current and a superimposed uniform magnetic field, applied perpendicular to the axis of symmetry of the hemisphere, is investigated. A series solution is developed when the inertial terms in the Navier-Stokes equations are neglected and numerical results are stated for values of the parameters which are particularly relevant to the welding of steel.

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Zusammenfassung Es wird die Strömung eines inkompressiblen Fluids in einer Halbkugel untersucht, die durch eine Verteilung von Strömen in einem gleichförmigen Magnetfeld induziert wird; das Feld steht senkrecht zur Symmetrieachse des Behälters. Eine Reihenentwicklung wird gegeben bei der die Trägheitsterme der Navier-Stokes'schen Gleichungen vernachlässigt werden. Numerische Resultate werden gegeben für Parameter die für das Schweissen von Stahl relevant sind.

     

Gewichtseichung

Analytical and Bioanalytical Chemistry -     

The simulation of inviscid,compressible flows using an upwind kinetic method on unstructured grids

A kinetic flux-vector-splitting method has been used to solve the Euler equations for inviscid, compressible flow on unstructured grids. This method is derived from the Boltzmann equation and is an upwind, cell-centered, finite volume scheme with an explicit time-stepping procedure. The Delaunay triangulation has been used to generate the grids. The approach is demonstrated for three flow field simulations, namely the subsonic flow over a two-component high-lift aerofoil, the transonic flow over an aerofoil and the supersonic flow in a channel.     

A flexible approach to expression evaluation within a computational engineering environment

In many stages of a typical computational simulation, the user has a requirement to extract data which is not always in a readily available form. Typical examples include mesh quality statistics, where the quality measure is typically defined using an expression involving the co-ordinates of each mesh cell, face, edge or node; solution visualisation, where the quantity to be displayed/analysed is an expression involving the resultant variables of the flow solver; and mesh adaption, where the refinement may be driven by a quantity which could be a combination of flow solution variables and the co-ordinates of the mesh edges. A code developer can readily modify source code to meet such requirements but this is not an option to a typical user and, when additionally, codes are embedded within graphical user interfaces. This paper describes EQUATE, a system designed to allow the user to define their own measures at run-time, and how it can be integrated into general interactive, graphical environments. © 1998 John Wiley & Sons, Ltd.