A transient thermal sensation equation fit for the modified Stolwijk model

There are different thermal perception models linked to a mathematical thermophysiological human model, with which the thermal sensation under stationary and/or dynamic conditions can be evaluated. Each of these perception and thermophysiological models have their own field of application. Stolwijk developed a thermophysiological human model...

On Senders’s models of visual sampling behavior

Objective: We review the sampling models described in John Senders’s doctoral thesis on “visual sampling processes” via a ready and accessible exposition. Background: John Senders left a significant imprint on human factors/ergonomics (HF/E). Here, we focus on one preeminent aspect of his career, namely visual attention. Methods: We present,...

Application of a criterion for cold cracking to casting high strength aluminum alloys

Direct chill (DC) casting of high strength 7xxx series aluminium alloys is difficult mainly due to solidification cracking (hot cracks) and solid state cracking (cold cracks). Poor thermal properties along with extreme brittleness in the as-cast condition make DC-casting of such alloys a challenging process. Therefore, a criterion that can...

Hydrodynamic Instabilities in Czochralski Process of Crystal Growth

This paper deals with axisymmmetry breaking instabilities in Czochralski process of crystal growth. Numerical linear stability analysis was carried out using the axisymmetric bulk flow model. Stability diagrams of critical Grashof numbers Grc and frequencies ?c dependent on aspect ratio alpha(=height/radius), 0.4 =< alpha =< 1.0 and Prandtl...

3D Simulation and Visualization Studies of Flow in Porous Media

Computer simulations of colloidal suspensions - using an improved lattice-Boltzmann scheme

Issues of parallelization in implementation of the combined simulation language cosmos

Computer-simulated deformation of meandering river patterns

A new model for bed topography is developed herein which accounts for phase lag and the influence of the width to depth ratio. This model is used to analyze four sets of data: two from laboratory channels and two from natural channels. Good agreement is found between the actual and the predicted bed topography. An iterative, two-dimensional...