Search results for: Numerical analysis

• Numerical analysis of a temporary steel grandstand

  Publication

  • N. Lasowicz
  • R. Jankowski

  - Year 2014

  The purpose of this paper is to present the results of the numerical analysis focused on the response of the temporary steel scaffolding grandstand subjected to human-induced vibrations due to jumping. Shell as well as beam elements have been used in the numerical model. Its first stage has involved conducting modal analysis in order to determine the modes of free vibrations and the corresponding natural frequencies for the empty...

• Numerical analysis of crack propagation in silicone nitride

  Publication

  • W. Karaszewski

  - Key Engineering Materials - Year 2012

  The properties of ceramics, specifically low density, high hardness, high temperature capability and low coefficient of thermal expansion are of most interest to rolling element manufacturers. The influence of ring crack size on rolling contact fatigue failure has been studied using numerical fracture analysis. Such cracks are very often found on ceramic bearing balls and decrease fatigue life rapidly. The numerical calculation...

• Numerical analysis of scale effects in open propellers

  Publication

  • T. Bugalski
  • J. Szantyr

  - Year 2012

  Artykuł przedstawia numeryczne badania efektu skali powodującego różnice w charakterystykach hydrodynamicznych śrub okrętowych wyznaczonych dla skali rzeczywistej i dla skali modelowej. Zaprezentowano wyniki obliczeń dla trzech przykładowych śrub, pokazując poprawki na efekt skali wyznaczone według czterech różnych metod.

• An Experimental and Numerical Analysis of Water Hammer Phenomenon in Slurries

  Publication

  • A. Kodura
  • P. Stefanek
  • K. Weinerowska-Bords

  - JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME - Year 2017

  The analysis of slurry transportation in pressure pipelines is important both from practical and theoretical point of view. Due to the nature of the medium, the number of problems arising in the course of design, operation, measurements and mathematical modeling is much higher compared to the cases where the flowing liquid is homogeneous. The equations describing the flow are more complex, and higher number of the parameters is...

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• Numerical analysis of pile installation effects in cohesive soils

  Publication

  • J. Konkol

  - Year 2018

  In this thesis the empirical equation for radial effective stress calculation after displacement pile installation and following consolidation phase has been proposed. The equation is based on the numerical studies performed with Updated Lagrangian, Arbitrary Lagrangian-Eulerian and Coupled Eulerian-Lagrangian formulations as well as the calibration procedure with database containing world-wide 30 pile static loading tests in cohesive...

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• Numerical analysis of elastic wave propagation in unbounded structures

  Publication

  • A. Żak
  • M. Krawczuk
  • Ł. Skarbek
  • M. Palacz

  - FINITE ELEMENTS IN ANALYSIS AND DESIGN - Year 2014

  The main objective of this paper is to show the effectiveness and usefulness of the concept of an absorbing layer with increasing damping (ALID) in numerical investigations of elastic wave propagation in unbounded engineering structures. This has been achieved by the authors by a careful investigation of three different types of structures characterised by gradually increasing geometrical and mathematical description complexities....

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• Numerical analysis of cylindrical shell subjected to explosive load

  Publication

  • A. Pestka

  - Year 2015

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• Experimental and numerical analysis of wave propagation in ground anchors

  Publication

  • B. Zima
  • M. Rucka

  - Year 2016

  The article focuses on wave propagation phenomenon in ground anchors. The main aim of the investigation is the non-destructive diagnostics and the assessment of the state of ground anchors, using the guided wave propagation method. Laboratory models of anchors with different lengths of the anchor body were tested and voltage signals of propagating waves were registered at several locations. For all tested specimens corresponding...

• Aluminium Profile Reinforced with Carbon Fibre: Numerical Analysis

  Publication

  • T. Kwiatkowski

  - Year 2013

• Numerical analysis of elastic wave propagation in unbounded structures

  Publication

  • A. Żak
  • M. Krawczuk
  • Ł. Skarbek
  • M. Palacz

  - FINITE ELEMENTS IN ANALYSIS AND DESIGN - Year 2014

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• Numerical analysis of the influence of a Gyrotron's cavity walls curvature

  Publication

  • B. Szlachetko
  • T. Wieckowski
  • E. Plinski

  - Year 2018

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• Numerical analysis of high temperature minichannels heat exchanger performance

  Publication

  • J. Wajs
  • T. Kura
  • D. Mikielewicz
  • E. Fornalik-Wajs
  • J. Mikielewicz

  - Year 2020

  Nowadays, the most difficult technological challenge in energy sector is connected with the gas micro-CHP units, dedicated to the distributed power generation. They are expected to be of high efficiency and at the same time of compact in size. Regarding the first reason, significant increase in microturbine efficiency can only be achieved by increase in the engine operating temperature. Therefore, one of the critical elements in...

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• Discussion. Numerical analysis of thin-walled frames with flexible joints

  Publication

  • C. K. Szymczak
  • I. Kreja
  • T. Mikulski
  • M. Kujawa

  - Archives of Civil Engineering - Year 2006

  Przedstwiono uwagi do artkułu Tews R., Rachowicz W. ''Numerical Analysis of Thin-Walled Frames with Flexible Joints'', Archives of Civil Engineering, 51, 3, 2005, ss. 344-369.

• Experimental and numerical analysis of an aluminum cantilevered beam with polymer adhesive

  Publication

  • N. Lasowicz
  • R. Jankowski

  - Procedia Engineering - Year 2017

  In this paper, experimental and numerical investigation on a composite cantilevered aluminum beam has been conducted. The subject of the study consists of two plain aluminum elements bonded with polymer adhesive of different thickness. It has been proven in the previous study that this kind of material has high damping properties. During an experimental investigation, value of damping ratios have been obtained. The aim of a numerical...

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• A numerical analysis of the thermal effects in the jet impingement stagnation zone

  Publication

  • T. Kura
  • E. Fornalik-Wajs
  • J. Wajs
  • S. Kenjeres
  • S. Gurgul

  - Year 2019

  Most of the flows occurring in the engineering systems are turbulent and their accurate numerical analysis is still challenging, especially when combined with the heat transfer. One of the methods of heat transfer enhancement is utilization of the turbulent impinging jets, which were recently applied also in the heat exchangers. Their positive impact on the heat transfer performance was proven, but many questions related to its...

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• Numerical analysis and in situ tests of the Grot Rowecki Bridge in Warsaw

  Publication

  • M. Miśkiewicz
  • Ł. Pyrzowski
  • K. Wilde
  • J. Chróścielewski

  - Year 2016

  The paper presents the FEM analysis of the reconstructed the Grot-Rowecki Bridge over Vistula river in Warsaw. The bridge has seven spans and consists of two independent structures with the longest spans of 120 m. After reconstruction the bridge is over 10 m wider. The numerical, nonlinear analysis has been con-ducted on a global and local FEM models. These models are defined so as they strictly comply with global structural bridge...

• Numerical analysis of the carpentry joints applied in the traditional wooden structures

  Publication

  • A. Pestka
  • P. Kłosowski

  - Year 2016

  The paper concerns the numerical analysis of the carpentry joints made from spruce wood. The material parameters of the wood have been calculated on the basis of nine independent material constants (an orthotropic material). The contact zone between the individual elements of the connection has been determined using Contact Tables in the MSC.Marc software. Five types of carpentry joints have been analyzed. The main aim of the research...

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• A conceptual design and numerical analysis of the mixerless urea-SCR system

  Publication

  • B. Kaźmierski
  • K. Górka
  • Ł. J. Kapusta

  - Combustion Engines - Year 2021

  In the present study, an innovative design of the urea-selective catalytic reduction (SCR) system without conventional mixing elements was developed. The aim was to obtain a high degree of urea decomposition, and uniform ammonia distribution at the inlet to the catalyst, while minimising the liquid film deposition and keeping the compact design. The concept of the design was based on creating high turbulences and elongating...

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• NUMERICAL ANALYSIS OF RUBBER BUMPERS INFLUENCE ON THE COLLIDING STEEL STRUCTURES

  Publication

  • B. Sołtysik

  - Dokonania Młodych Naukowców - Year 2014

  Problem of collisions of neighbouring structures is one of the important issues related to the safety of civil engineering structures. The safety and reliability of steel structures under impact loading is among a number of different aims during the design state. The aim of this paper is to present the results of numerical investigation of dynamic behavior of closely-separated steel structures under seismic excitation. Modal and transient...

• Numerical analysis of vacuum drying of a porous body in the integrated domain

  Publication

  • M. Amiri
  • M. B. Ayani
  • P. Ziółkowski
  • D. Mikielewicz

  - JOURNAL OF FOOD PROCESS ENGINEERING - Year 2022

  n the present study, the vacuum drying process of an apple slice is numerically modeled based on a control volume method. Transient two-dimensional Navier– Stokes, energy, moisture, and Luikov equations are solved by numerical coding (Fortran) to simulate the simultaneous heat and mass transfer in the ambient and apple slice, respectively. The privilege of using Luikov's model is that the capillary forces are considered, and a...

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• Fast numerical analysis of dielectric resonators with perturbed rotational symmetry

  Publication

  • M. Wiktor
  • M. Mrozowski

  - Year 2005

  W artykule zaprezentowano metody szybkiej analizy rezonatorow o symetrii zblizonej do osiowej metodą różnic skończonych w dziedzinie częstotliwości. Dzięki użyciu techniki rozwinęć funkcyjnych w jednorodnych obszarach uzyskano redukcję rozmiaru i znaczne przyspieszenie zbieżności problemu własnego, reprezentującegowspomniane układy. Dzięki elastycznemu sposobowi łączenia dziedzin z i bez rozwinięć funkcyjnych możliwe było zaadaptowanie...

• Theoretical and numerical analysis of free vibration of liquid-filled tanks

  Publication

  • K. Trębacki

  - Year 2005

  W pracy rozpatrywano drgania giętne belki o stałym przekroju prostokątnym wypełnionej cieczą idealną. Częstości drgań własnych i formy drgań belki wyznacza się z nieskończonych układów równań algebraicznych (30) i (54). Rozwiązania przedstawiono na wykresach.

• Numerical Analysis of Flow in Building Arrangement: Computational Domain Discretization

  Publication

  • M. Sosnowski
  • R. Gnatowska
  • K. Grabowska
  • J. Krzywański
  • A. Jamrozik

  - Applied Sciences-Basel - Year 2019

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• Numerical analysis of the finite amplitude plane wave propagation problem

  Publication

  • A. Baranowska

  - HYDROACOUSTICS - Year 2006

  Rozważano zagadnienie propagacji fali płaskiej o skończonej amplitudzie w środowisku wodnym. Przedstawiono model matematyczny i przykładowe wyniki obliczeń numerycznych. Model matematyczny zbudowano w oparciu o równanie akustyki nieliniowej. Do rozwiązania zagadnienia zastosowano metodę różnic skończonych. Badano wpływ wartości parametrów numerycznych na dokładność obliczeń oraz analizowano wpływ wartości parametrów fizycznych...

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• Numerical analysis of laminated shells under in-plane axial compression

  Publication

  • A. Sabik
  • I. Kreja

  - Year 2009

  W pracy analizowana jest stateczność powłoki warstwowej poddanej osiowemu ściskaniu. Badany jest wpływ wariantów uwarstwienia oraz warunków podparcia krawędzi obciążonej na zachowanie konstrukcji. Wyniki numeryczne porównano z eksperymentem.

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• Topological-numerical analysis of a two-dimensional discrete neuron model

  Publication

  • P. Pilarczyk
  • J. Signerska-Rynkowska
  • G. Graff

  - CHAOS - Year 2023

  We conduct computer-assisted analysis of a two-dimensional model of a neuron introduced by Chialvo in 1995 [Chaos, Solitons Fractals 5, 461–479]. We apply the method of rigorous analysis of global dynamics based on a set-oriented topological approach, introduced by Arai et al. in 2009 [SIAM J. Appl. Dyn. Syst. 8, 757–789] and improved and expanded afterward. Additionally, we introduce a new algorithm to analyze the return times...

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• Numerical analysis of the ostiomeatal complex aeration using the CFD method

  Publication

  • D. Tretiakow
  • K. Tesch
  • K. Markiet
  • T. Przewoźny
  • A. Kusiak
  • D. Cichońska
  • A. Skorek

  - Scientific Reports - Year 2023

  We aimed to analyse ostiomeatal complex (OMC) aeration using the computational fluid dynamics (CFD) method of simulation based on human craniofacial computed tomography (CT) scans. The analysis was based on CT images of 2 patients: one with normal nose anatomy and one with nasal septal deviation (NSD). The Reynolds-Average Simulation approach and turbulence model based on linear eddy viscosity supplemented with the two-equation...

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• Experimental and numerical analysis of streamwise vortex generator for subsonic flow

  Publication

  • P. Flaszyński
  • R. Szwaba

  - Chemical and Process Engineering : New Frontiers - Year 2006

  W pracy przedstawiono porównanie wyników obliczeń numerycznych dwoma kodami (FLUENT i SPARC) na tle badań eksperymentalnych generatora wirów wzdłużnych. Przedstawiono wyniki dla liczb Macha przepływu głównego 0.3 i 0.8. Porównano ciśnienie całkowite w dwóch przekrojach za otworem przez który realizowany jest wydmuch. Przedstawiono strukturę wiru wzdłużnego uzyskaną dla obu programów. Średnica otworu jetu jest równa 1mm, co odpowiada...

• Numerical analysis on axial capacity of steel built-up battened columns

  Publication

  • P. Pieczka
  • P. Iwicki

  - Archives of Civil Engineering - Year 2022

  This paper deals with the numerical analysis aimed at study the bearing capacity of pinended steel built-up columns under axial compression. Finite element (FE) models were performed for the columns presented in the literature. The main problem discussed in the article is the shape and magnitude of geometric imperfections introduced into the numerical FE model, necessary to obtain the load capacity consistent with the experimental...

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• Numerical analysis of mechanical properties of an infill structure used in 3D printings

  Publication

  • K. Bobrowski
  • W. Wojnicz
  • K. Lipiński

  - Inżynieria Materiałowa - Year 2018

  The paper presents results of a numerical analysis focused on an identification of mechanical properties of an element created by using Fused Deposition Modelling additive manufacturing technique (FDM). There is presented a description of technology of the 3D printing, numerical model created by using the finite element method (FEM), as well as some problems referred to estimation of the mechanical properties of the printout. The...

• COMPARATIVE NUMERICAL ANALYSIS OF DIFFERENT STRENGTHENING SYSTEMS OF HISTORICAL BRICK ARCHES

  Publication

  • M. Zielińska

  - International Journal of Applied Mechanics and Engineering - Year 2017

  The article presents a comparative numerical analysis of various ways to strengthen historical brick arches. Five ways of strengthening brick arches with steel tie-rods have been proposed. Two of these involve the use of braces wrapped around pillars supporting the arch connected with a tie-rod; another two ways involve the use of the tie-rods with welded metal sheets of different sizes; the last way involves the use of the tie-rod...

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• Nonlinear Modeling in Time Domain Numerical Analysis of Stringed Instrument Dynamics

  Publication

  • P. Bielski
  • M. Kujawa

  - Year 2017

  Musical instruments are very various in terms of sound quality with their timbre shaped by materials and geometry. Materials' impact is commonly treated as dominant one by musicians, while it is unclear whether it is true or not. The research proposed in the study focuses on determining influence of both these factors on sound quality based on their impact on harmonic composition. Numerical approach has been chosen to allowed independent...

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• Numerical Analysis of Seismic Pounding between Adjacent Buildings Accounting for SSI

  Publication

  • M. E. Uz
  • A. Jakubczyk-Gałczyńska
  • R. Jankowski

  - Applied Sciences-Basel - Year 2023

  The structural pounding caused by an earthquake may damage structures and lead to their collapse. This study is focused on the pounding between two adjacent asymmetric structures with different dynamic properties resting on the surface of an elastic half-space. An exploration of the relationship between the effects of the seismic analysis with the impact response to the torsional pounding between adjacent buildings under different...

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• Research into flows in turbine blade seals. Part II: Numerical analysis

  Publication

  • R. Stępień
  • K. Kosowski
  • J. Badur

  - TASK Quarterly - Year 2003

  Przedstawiono wyniki badań numerycznych programem Fluent przepływów w uszczelnieniu nadbandażowym stopnia turbinowego. Badania wykonano przy zastosowaniu różnych typów siatek obliczeniowych, różnych rodzajów "zszywek" oraz różnych metod obliczeniowych (Mixing Plane, Sliding Mesh, Multiple ReferenceFrame).

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• Numerical analysis of CO2-water separation in a horizontal double T-junction

  Publication

  • M. Amiri
  • P. Ziółkowski
  • K. Stasiak
  • D. Mikielewicz

  - Year 2022

  Carbon dioxide is considered one of the main factors leading to global warming. Considering the significant impacts of CO2 on climate change, various technologies have been developed in recent decades to control carbon emission, such as for example CO2 capture and storage. The developed cycle of a negative CO2 emission power plant includes some devices, out of which, separator plays an indispensable role. To this end, T-junction...

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• Numerical analysis of the influence of combustible material on the temperature field during fire

  Publication

  • M. Sosnowski
  • K. Grabowska

  - Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Technika, Informatyka, Inżynieria Bezpieczeństwa - Year 2015

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• Field investigation and numerical analysis of an inverted pavement system in Tennessee, USA

  Publication

  • X. Jiang
  • J. Gabrielson
  • H. Titi
  • B. Huang
  • Y. Bai
  • P. Polaczyk
  • W. Hu
  • M. Zhang
  • R. Xiao

  - Transportation Geotechnics - Year 2022

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• Numerical analysis of behaviour of reinforced concrete elements under eccentric compression

  Publication

  • T. Majewski
  • J. Tejchman

  - TASK Quarterly - Year 2002

  Przedstawiono wyniki modelowania nośności elementów żelbetowych stosując metodę elementów skończonych. Do opisu betonu zastosowano sprężysto-plastyczne prawo materiałowe wg Druckera-Pragera. Do modelowania stali zbrojeniowej zastosowano sprężysto-plastyczne prawo materiałowe według von Misesa. Obliczenia wykonano dla ścian żelbetowych.

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• Diagnosis of Damage in a Steel Tank with Self-Supported Roof through Numerical Analysis

  Publication

  • D. Burkacki
  • M. Wójcik
  • R. Jankowski

  - Key Engineering Materials - Year 2013

  The safety of civil engineering structures is one of the most important issues of building industry. That is why the assessment of the damage-involved structural response has recently become of major concern to engineers. Among a number of different approaches to diagnosis of damage, the method of measuring the changes in natural frequencies is considered to be one of the most effective indicators of global damage. From the practical...

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• Numerical analysis of high temperature minichannel heat exchanger for recuperative microturbine system

  Publication

  • J. Wajs
  • T. Kura
  • D. Mikielewicz
  • E. Fornalik-Wajs
  • J. Mikielewicz

  - ENERGY - Year 2022

  Considering the development of energy sector, distributed small-scale power generation, e.g., gas micro-CHP, is attracting considerable interest. In such installations, the heat exchanger is one of the key components possessing a significant influence on overall performance. Most studies concentrate on units operating below 900C, which do not fulfil the requirements of gas micro-CHP. Therefore, there remains a challenge to design...

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• Stability Assessment of Coastal Cliffs Incorporating Laser Scanning Technology and a Numerical Analysis

  Publication

  • P. Tysiąc
  • R. Ossowski
  • M. Przyborski

  - Remote Sensing - Year 2019

  We investigated the cli coast in Jastrzebia Gora, Poland. The measurements that were taken between 2014 and 2018 by applying terrestrial, mobile, and airborne laser scanning describe a huge geometric modification involving dislocations in a 2.5 m range. Dierential maps and a volumetric change analysis made it possible to identify the most deformed cli’s location. Part of the monitoring of coastal change involved the measurement...

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• Heat transfer intensification by jet impingement – numerical analysis using RANS approach

  Publication

  • T. Kura
  • E. Fornalik-Wajs
  • J. Wajs
  • S. Kenjeres

  - E3S Web of Conferences - Year 2019

  Jet impingement is a method of the heat transfer enhancement applied in the engineering systems. The idea is to generate fast-flow fluid jet which impinge on the heated (or cooled) surface, causing significantly higher heat transfer rate. Although some flat surface jet impingement cases are described in the literature, the validated data is still limited. The reason is coming from the fact, that these flows are hydrodynamically...

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• Historical carpentry corner log joints—Numerical analysis within stochastic framework

  Publication

  • P. Kłosowski
  • I. Lubowiecka
  • A. Pestka
  • K. Szepietowska

  - ENGINEERING STRUCTURES - Year 2018

  The paper presents the results of numerical analysis performed on historical, traditional carpentry corner logjoints of two basic topologies: the short-corner dovetail connection and the saddle notch connection. These types of carpentry joints are commonly used in currently preserved objects of wooden architecture. All connections have been modelled in pinewood, which has been defined in the Finite Element software MSC.Marc/Mentat...

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• Experimental-Numerical Analysis of the Effect of Bar Diameter on Bond in Pull-Out Test

  Publication

  • M. Burdziński
  • M. Niedostatkiewicz

  - Buildings - Year 2022

  Bar diameter is one of the basic factors affecting bond behavior, which is still of interest due to opposing opinions regarding its effect on bond behavior in the pull-out test. This paper presents an experimental and numerical bond analysis of ribbed reinforcing bar in concrete. The aim was to experimentally evaluate the effect of bar diameter on the bond behavior in the pull-out test and to perform numerical simulations of the...

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• Numerical Analysis of Impact of Energy Buoy Anchoring Configurations on its Motion and Efficiency

  Publication

  • P. Dymarski
  • C. Dymarski

  - Year 2013

  This paper presents a numerical analysis of the impact of energy buoy mooring configurations on its movement on the wave and effectiveness. The method used to analyse the buoy movement modelling in six degrees of freedom was described in a paper presented at the Conference 2011. Simulations of the buoy movement in regular wave and power calculations were conducted for several configurations of anchoring systems and position of...

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• Numerical Analysis of Magnetic Core Properties Influence on Residual Current Device Behaviour

  Publication

  • S. Czapp
  • J. Horiszny

  - Year 2009

  W artykule przedstawiono analizę wpływu kształtu prądu w uzwojeniu pierwotnym transformatora prądowego na pracę przekładnika różnicowo-prądowego. Przeprowadzono obliczenia symulacyjne dla wymuszenia o kształcie sinusoidy i sinusoidy wyprostowanej dla częstotliwości 50 Hz. Wzięto pod uwagę dwa typy charakterystyki magnesowania transformatora: dla materiału magnetycznie miękkiego i materiału o prostokątnej pętli histerezy. Analiza...

• Experimental and numerical analysis of the modified TB32 crash tests of the cable barrier system

  Publication

  • D. Bruski
  • S. Burzyński
  • J. Chróścielewski
  • K. Jamroz
  • Ł. Pachocki
  • W. Witkowski
  • K. Wilde

  - ENGINEERING FAILURE ANALYSIS - Year 2019

  Road restraint systems, including safety barriers, are one of the means used to improve road safety. Currently, they can be allowed to general use after passing the specific crash tests. However, it is always important and desirable to evaluate their performance under various realistic conditions, which can happen on the roads. In this study, the behaviour of the cable barrier system in impact conditions different than assumed...

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• Numerical analysis of the container vessel's self-propulsion at different rudder deflection angles

  Publication

  • R. Kołodziej
  • W. Michał
  • B. Sebastian

  - Year 2019

  Nowadays, CFD becomes one of the most commonly used research method in ship hydrodynamics, limited to the analyses of hull resistance in calm water. With continuously improving computing power and increasingly more accurate numerical methods it is possible to simulate more complex cases. State of the art CFD tools also enable development of new ways of assessing ship maneuvering performance. This paper presents an attempt on using...

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• Numerical Analysis of Recharge Rates and Contaminant Travel Time in Layered Unsaturated Soils

  Publication

  • A. Szymkiewicz
  • J. Savard
  • B. Jaworska-Szulc

  - Water - Year 2019

  This study focused on the estimation of groundwater recharge rates and travel time of conservative contaminants between ground surface and aquifer. Numerical simulations of transient water flow and solute transport were performed using the SWAP computer program for 10 layered soil profiles, composed of materials ranging from gravel to clay. In particular, sensitivity of the results to the thickness and position of weakly permeable...

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• Modelling and Measurement of Folk Guitar: Truss Rod and Strings in Numerical Analysis of Tone

  Publication

  • P. Bielski
  • M. Kujawa
  • I. Lubowiecka

  - Archives of Acoustics - Year 2019

  The study makes an attempt to model a complete vibrating guitar including its non-linear features, specifically the tension-compression of truss rod and tension of strings. The purpose of such a model is to examine the influence of design parameters on tone. Most experimental studies are flawed by uncertainties introduced by materials and assembly of an instrument. Since numerical modelling of instruments allows for deterministic...

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