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Displaying 361 –
380 of
549
A numerical study of a two-dimensional model for premixed gas combustion in
a narrow, semi-infinite channel with no-slip boundary condition is performed. The work
is motivated by recent theoretical advances revealing the major role of hydraulic resistance
in deflagration-to-detonation transition, one of the central yet still inadequately understood
phenomena of gaseous combustion. The work is a continuation and extension of recently
reported results over non-isothermal boundary conditions, wider...
The one-dimensional steady-state convection-diffusion problem for the unknown temperature of a medium entering the interval with the temperature and flowing with a positive velocity is studied. The medium is being heated with an intensity corresponding to for a constant . We are looking for a velocity with a given average such that the outflow temperature is maximal and discuss the influence of the boundary condition at the point on the “maximizing” function .
Advanced building design is a rather new interdisciplinary research branch, combining knowledge from physics, engineering, art and social science; its support from both theoretical and computational mathematics is needed. This paper shows an example of such collaboration, introducing a model problem of optimal heating in a low-energy house. Since all particular function values, needed for optimization are obtained as numerical solutions of an initial and boundary value problem for a sparse system...
In the contribution we present a problem of shape optimization of the cooling cavity of a plunger that is used in the forming process in the glass in dustry. A rotationally symmetric system of the mould, the glass piece, the plunger and the plunger cavity is considered. The state problem is given as a stationary heat conduction process. The system includes a heat source representing the glass piece that is cooled from inside by water flowing through the plunger cavity and from outside by the environment
surrounding...
Experimental evidence points to a rich variety of physical scenarios that arise when a
laminar flame propagates through a pre-mixture of evaporating liquid fuel and a gaseous
oxidant. In this paper new results of time-dependent numerical simulations of rich
off-stoichiometric spray flame propagation in a two-dimensional channel are presented. A
constant density model is adopted, thereby eliminating the Darrieus-Landau instability. It
is demonstrated...
L'articolo riassume il quadro dei risultati noti circa il cosiddetto problema di Stefan con sopraraffreddamento. Con ciò si intende in senso lato l'estensione del modello di Stefan a quei casi in cui la temperatura della fase liquida (solida) non è confinata al di sopra (sotto) di quella di cambiamento di fase, supposta costante. La nostra discussione è prevalentemente rivolta allo sviluppo di singolarità (non limitatezza della velocità dell'interfaccia, ecc.), al modo di prevederle, di prevenirle...
Currently displaying 361 –
380 of
549