Advanced Materials Research Vol. 1040

Abstract: Modern construction industry is in need of new building materials with improved operational properties. One of such materials is the sulfur-bituminous concrete – composite with matrix formed from sulfur and bitumen mix. Despite the high values of operational properties and economic efficiency of such concrete, there is the lack of necessary knowledge about technological properties of sulfur-bituminous concrete mix. The results of numerical modeling can be used to make initial decisions concerning values of control variables (relevant to mixture and technology). In the given work we present short review of the model and simulation algorithm involving particle systems as a material’s model and discuss the modeling results obtained during numerical studies of compaction process of sulfur-bitumen concrete. It is shown that for aggregates with size of one centimeter the optimal value of average thickness of the sulfur-bitumen layer is near to the one millimeter. Concrete mixes for which this condition is met can be characterized by dense structure similar to face-centered cubic.

Abstract: Using numerical experiment the gas flow in the gravity field through a plane porous object with heat sources inside and partial closure of the object's outlet has been investigated and compared with axisymmetric case. The influence of partial closure of the object's outlet on the cooling process of the plane porous objects with a non-uniform distribution of heat sources has been analyzed by means of computational experiment. It has been revealed that effect of the top cover on a cooling process of the plane porous objects is qualitatively the same as in the axisymmetric objects, but quantitative differences are significant.

Abstract: The numerical analysis has been made of complex interrelated heat and mass transfer processes, chemical reactions and phase transformations under the thermal decomposition reaction suppression of typical combustible wood (needles of a pine, fir, fir-tree and larch, branches of a pine, fir, birch and larch, cones of a pine, leaves of aspen) by the “water slug” trace. Characteristic times have been calculated of the thermal decomposition reaction suppression of typical combustible wood at typical temperatures in “water slug” trace and the thickness of warmed material layers.

Abstract: The mathematical model of heat and mass transfer processes at polymeric material ignition by several metal particles heated to high temperatures was developed. Numerical research of integrated characteristic at the accounting of diffusive and convective heat and mass transfer in the oxidizer during the induction period was executed. Common effect of several local sources with limited power consumption on the main integrated characteristic of process – ignition delay time was established.

Abstract: In this paper, the mathematical model is developed for the numerical research on the condenser tubes’ relative position influence on the output temperature of a two-phase stream. The limit distance between the condenser tubes which provides the required output vapor parameters is established.

Abstract: The problem of premixed gas combustion in porous cylindrical burner is investigated numerically. Two-temperature diffusional-thermal model taking into account radiative heat transfer described in the framework of Eddington model is applied. It was found that radiative heat transfer affects the characteristics of filtration combustion, such as temperature distribution and the flame radius, substantially. It is demonstrated that the overall heat flux from outer burner surface is significantly caused by heat radiation from the inner regions of the porous media. Account of the thermal radiation from the burner interior leads to the shift of the spectral power distribution maximum towards the short wave region in comparison with spectral density calculated on the base of burner outlet surface temperature.

Abstract: Parallel algorithm for modeling the unsteady 2D gas flows through a porous media with energy sources is presented. A mathematical model of dynamic processes in porous heat-evolutional object is mentioned briefly. The structure of sequential algorithm and its parallel version is described in details. The performance and efficiency of parallel algorithm and its realization using OpenMP technology is evaluated.

Abstract: The heat and kinetic phenomena accompanying the carbide coating growth during deposition from plasma are investigated numerically. The coupling model taking into account some cross-effects between fields of various physical natures was used here. The phase, elements distribution, stresses and strains in the growing coating and substrate of cylindrical form where calculated. It is demonstrated that interrelation between diffusion and deformation plays a significant role for coating composition change.

Abstract: This paper is devoted to one of the crystal plasticity physical theories for description of the crystalline solid behavior under high strains. The boundary value problem is formulated to consider uniaxial compression of aluminum single crystal. The numerical experiment data were obtained during the solving of this problem, which analysis shows good accordance with the full-scale experiment.

Abstract: The problems related to the construction of multi-level mathematical models of inelastic deformation of crystalline materials based on crystal plasticity are considered. The example of the two-level model for description the severe plastic deformation of fcc polycrystals is discussed. The issues relating to the description of hardening and rotations of crystal lattices of the grains are discussed. The focus is on the formation of residual mesostresses in individual grains in the case of polycrystalline stress relief with a representative volume in general.