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A numerical study is performed to investigate flow instability phenomena in a square channel with steady, laminar throughflow. The channel rotates around an axis perpendicular to the channel longitudinal axis. The flow field extends from the channel entrance to a distance of 120 to 600Dh. The...
A number of finite element formulations involving discontinuous weighting functions have been tested against analytic solutions for a steady scalar convectiondiffusion problem at intermediate Peclet number, with a hard downstream boundary condition. The emphasis is on extending these methods to...
A simple convection algorithm for simulation of timedependent supersonic and hypersonic flows of a perfect but viscous gas is described. The algorithm is based on conservation and convection of mass, momentum and energy in a grid of rectangular cells. Examples are given for starting flow in a...
Two common fixed grid enthalpy methods used in the numerical modelling of phase change problems are the apparent heat capacity and the source based methods. In this paper, a general enthalpy method that includes as subsets both apparent heat capacity and source based methods, is derived....
A novel numerical technique is presented with which the temperature profile within a selected transverse plane of an object can be reconstructed provided the boundary data around the transverse plane are known. Numerical simulations of the proposed computed tomography technique are performed to...
A method of estimating a heat transfer coefficient at the surface of a solid body is described. Knowing the ambient temperature and the temperature history at an inner point points of the body, the heat transfer coefficient is computed. The inverse algorithm can respect the nonlinear nature of...
The effect of a rectangular obstruction of different sizes on natural convection heat transfer in the case of a vertical channel has been analysed for T boundary conditions on the walls. A comparison of the Nusselt number values with those for plane channel is presented. For smaller obstruction...
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