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Bulletin of the Polish Academy of Sciences. Technical Sciences
EN In this paper we present implementation of the MUSCL-Hancock method for numerical solutions of the Euler equations. As a result of the internal complexity of these equations solving them numerically is a formidable task. With the use of the original C++ code, we developed and presented results of a [...]
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Archives of Acoustics
EN Several methods can be applied for analyses of the acoustic field in enclosed rooms namely: wave propagation, geometrical or statistical analysis. The paper presents problems related to application of the boundary elements method to modelling of acoustic field parameters. Experimental and numerical [...]
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Control and Cybernetics
EN We discuss numerical methods to solve the Cauchy problem for hyperbolic equations, paying attention to equations which describe physical phenomena in fluid dynamics. We concentrate on Godunov-type methods which adopt Riemann solvers. These methods constitute a formidable task due to complexity of hy[...]
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Journal of Theoretical and Applied Mechanics
2011 Vol. 49 nr 4 1019-1028
PL Analiza termiczno-derywacyjna (ATD) stanowi efektywne narzędzie ilościowej oceny parametrów krzepnięcia stopów odlewniczych (np. temperatury początku i końca krzepnięcia, kinetyki wydzielania się ciepła przemiany, itd.). Urządzenie ATD daje możliwość obserwacji krzywych stygnięcia (nagrzewania) oraz[...]
EN Thermal and differential analysis (TDA) is often used as a tool for quantitative estimation of solidification parameters of alloys (e.g. temperatures corresponding to the beginning and the end of phase change, kinetics of latent heat evolution, etc). TDA system offers a possibility of observation of[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN Determination of the model's parameters is an important stage of mathematical models' application. In the case of a free-surface ID unsteady flow model defined by the de Saint- Venant equations, one of the groups of parameters to be estimated is the set of parameters describing energy losses due to [...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The water hammer problem is considered, one of the most important questions of unsteady flows in pipelines. Although first mentioned in the scientific literature more than a hundred years ago and widely analyzed since in many research centers, the problem is not fully recognized yet. It may be consi[...]
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Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej
2006 Vol. 5, nr 1 148-153
EN In the paper the inverse heat conduction problem is discussed. The energy equation contains the term determining the capacity of volumetric internal heat sources q(x) (x is a geometrical coordinate) and this parameter is identified. The solution of inverse problem bases on the least square criterion[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN This paper is devoted to the space-time conservation (STC) method and its application to a water hammer in steel pipelines. The STC method, due to its numerical properties, in particular its high accuracy, can be an interesting alternative to traditional numerical methods, especially when dealing wi[...]
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Polish Journal of Chemistry
EN New developments in the field of charge separation in large finite systems pertain to extreme ionization of elemental and molecular clusters in ultraintense laser fields (peak intensities 1015-1021 Wcm-2) with the production of highly charged ions (e.g., completely ionized deuterium, water and metha[...]
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Zeszyty Naukowe. Transport / Politechnika Śląska
2001 z. 42 231-236
PL Obecnie spotykane postacie konstrukcyjne kolejowych zestawów kołowych są wynikiem nałożenia się doświadczeń eksploatacyjnych i technologii , a w ostatnim okresie także wyników analiz numerycznych wykorzystywanych przy ich projektowaniu. Jedną z metod symulacji numerycznych służącą do wyznaczenia pr[...]
EN Constructional forms of wheel sets currently appearing resulted from exploitation and technological experiences, and lately also - from numerical analysis which are used in wheel set projecting. One of the numerical simulation method which is used in exploitation dislocation and stresses allocated i[...]
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Computer Assisted Mechanics and Engineering Sciences
EN In the paper a new approach for the computation of slightly damped elastic structural vibrations over the medium frequency range is proposed. The effective quantities (deformation energy, vibrational intensity, etc...) are evaluated after resolution of a small system of equations that does not in an[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2000 Vol. 4, No 2 179-192
EN The paper presents a qualitative comparison of 2D and 3D computation of the flow field in a cone shaped turbine nozzle. The calculation yields a surface, S/sub 2/, for a given conical stream surface S/sub 1/. The S/sub 2/ stream surface represents the curvature of blading passages. This formulation [...]
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Computer Assisted Mechanics and Engineering Sciences
EN The paper presents the possibility of the limit stress state approximation of the reinforced concrete wall structures by discontinuous stress fields with variable configuration. Heuristic optimization technique, simulated annealing, is applied to determine optimal configuration for approximation of [...]
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Computer Assisted Mechanics and Engineering Sciences
EN An efficient, accurate, and simple numerical method is necessarv for analysis and design of an incompressible potential flow around multi-element airfoils. In this paper, which is the subject of the second part of the study, the mathematical model is built utilizing the local coordinate system, wh[...]
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Computer Assisted Mechanics and Engineering Sciences
EN Frontal polymerization has been studied for many years experimentally and theoretically. This technique can exhibit a phase change between a liquid monomer and a solid polymer and many studies, both theoretical and experimental, have been devoted to the stability of the front which separates the two[...]
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Polish Maritime Research
2011 nr 4 14-22
EN The article presents the results of the research project concerning tip vortex cavitation. This form of cavitation is very important in operation of many types of rotary hydraulic machines, including pumps, turbines and marine propellers. Tip vortex cavitation generates noise, vibration and erosion.[...]
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Polish Maritime Research
2012 nr 3 3-15
EN The article presents the numerical method for prediction of tip vortex cavitation generated on hydrofoils. This method has been developed in the course of numerical and experimental research described in earlier publications. The objective of the research was to design the optimum discrete grid stru[...]
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Polish Maritime Research
2009 nr 3 11-17
EN The article presents the results of the research project concerning the process of formation of the tip vortices shed from hydrofoils of different geometry in different flow conditions. Three hydrofoils resembling the contemporary marine propeller blades have been selected for the study. The experim[...]
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Polish Maritime Research
2010 nr 2 10-17
EN The possibly accurate numerical prediction of the detailed structure of vortices shed from the tips of hydrofoils is an important element of the design process of marine propellers. The concentrated tip vortices are responsible for the propeller cavitation erosion and acoustic emission. The purpose [...]
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Opto - Electronics Review
EN The article presents numerical investigations of high-contrast grating mirrors. First, it shows the basis of a new numerical method for computing the parameters of the grating and next it describes the results of the analysis of the manufacturing imperfections impact on the reflection coefficient. F[...]
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