Search results for: GRANULAR MATTER SIMULATION

• Organic matter removal efficiency in treatment wetlands simulation by COD fractions

  Publication

  • M. Gajewska
  • M. Marcinkowski
  • H. Obarska-Pempkowiak

  - Year 2013

  The objective of this paper was to investigate the organic fraction (colloidal, particulate, and dissolved) in sewage treatment in treatment wetland. Performance of TWs was simulated well with a simple first order model k – C* based on monitoring data. In this investigation background or residual concentration (C*) was assumed to be equal concentration of input influent organic matter in particulate (CODp). Calculated reaction...

• Simulation of shear localization in granular bodies within gradient-enhanced hypoplasticity.

  Publication

  • J. Tejchman

  - Year 2004

  W artykule przedstawiono wyniki numerycznej analizy ściskania w płaskim stanie odkształcenia dla materiałów granulowanych. Obliczenia przeprowadzono z modelem hipoplastycznym rozszerzonym o gradienty modułu przyrostu odkształceń. Obliczenia wykonano dla różnych długości charakterystycznych w próbce piasku zagęszczonego.

• Comparative study of high‑pressure fluid flow in densely packed granules using a 3D CFD model in a continuous medium and a simplified 2D DEM‑CFD approach. Granular Matter

  Publication

  • R. Abdi
  • M. Krzaczek
  • J. Tejchman

  - GRANULAR MATTER - Year 2022

  Izotermiczny ściśliwy jednofazowy przepływ cieczy przez niejednorodną masę ziarnistą składającą się z gęsto upakowanych zachodzących na siebie kul imitujących skałę pod wysokim ciśnieniem zbadano numerycznie przy użyciu dwóch różnych podejść. Pierwsze podejście zwane pełnym modelem 3D CFD stosowało metodę skończonych objętości (FVM) do rozwiązania uśrednionego równania Naviera-Stokesa zakładając model naprężeń Reynoldsa (BSL) w...

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• Selection of material for X-ray tomography analysis and DEM simulations: comparison between granular materials of biological and non-biological origins

  Publication

  • L. Babout
  • K. Grudzień
  • J. Wiącek
  • M. Niedostatkiewicz
  • B. Karpiński
  • M. Szkodo

  - GRANULAR MATTER - Year 2018

  Physical properties and X-ray tomography images of five different granular materials: glass bead, glass grit, short grain white rice, sorghum and clay granules (Seramis) are investigated to select the most promising materials for numerical simulations and time-lapse X-ray tomography imaging. The examined materials represent granular materials of non-biological origin (glass bead, glass grit and Seramis) and granular plant materials...

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• Relationship between vortex structures and shear localization in 3D granular specimens based on combined DEM and Helmholtz-Hodge decomposition.

  Publication

  • J. Kozicki
  • J. Tejchman

  - GRANULAR MATTER - Year 2018

  Relationship between vortex structures and shear localization in 3D granular specimens based on combined DEM and Helmholtz-Hodge decomposition. Granular Matter, doi:10.1007/s10035-018-0815-0, 2018.

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• Application of a cellular automaton to simulations of granular flow in silos

  Publication

  • J. Kozicki
  • J. Tejchman

  - GRANULAR MATTER - Year 2005

  A cellular automaton based on a gas model of hydrodynamics was used to calculate the kinematics of non-cohesive granular materials during confined flow in a mass flow and funnel flow model silo. In the model, collisions of particles were taken into account during granular flow. In addition, a simplified automaton was used wherein granular flow was assumed as an upward propagation of holes through a lattice composed of cells representing...

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• DEM investigations of two-dimensional granular vortex- and anti-vortex- structures during plane strain compression.

  Publication

  • J. Kozicki
  • J. Tejchman

  - GRANULAR MATTER - Year 2016

  DEM investigations of two-dimensional granular vortex- and anti-vortex- structures during plane strain compression.

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• FE-analysis of contractant shear zones in loose granular materials

  Publication

  • J. Tejchman

  - GRANULAR MATTER - Year 2007

  W artykule przedstawiono wyniki numerycznej analizy stref ścinania w materiałach granulowanych luźnych. Obliczenia wykonano dla 4 różnych problemów brzegowych: ścinania warstwy między dwoma bardzo szorstkimi ścianami, ściskania w płaskim stanie odkształcenia, dwuosiowego ściskania, odporu na ściankę. Obliczenia wykonano stosując metodę elementów skończonych na bazie mikropolarnego prawa hipoplastycznego.

• FE-studies on shear localization in an anisotropic micro-polar hypoplastic granular material

  Publication

  • J. Tejchman
  • A. Niemunis

  - GRANULAR MATTER - Year 2006

  W artykule przedstawiono wyniki numerycznej wpływu anizotropii w materiałach granulowanych na powstawanie lokalizacji odkształceń. Obliczenia wykonano dla ściskania dwuosiowego stosując metodę elementów skończonych na bazie mikropolarnego prawa hipoplastycznego.

• FE-investigation of shear localization in granular bodies under high shear rate

  Publication

  • J. Tejchman
  • W. Wu

  - GRANULAR MATTER - Year 2008

  Artykuł omawia wpływ prędkości ścinania an lokalizację odkształceń wwąskiej warstwie piasku poddanej ścinaniu. Obliczenia wykonano przyzastosowaniu metody elementów skończonych i mikropolarnego modeluhipoplastycznego rozszerzonego o lepkość.

• Discrete modelling results of a direct shear test for granular materials versus FE results

  Publication

  • J. Kozicki
  • M. Niedostatkiewicz
  • J. Tejchman
  • H. B. Muhlhaus

  - GRANULAR MATTER - Year 2013

  Artykuł porównuje wyniki DEM i MES dla testu bezpośredniego ścinania materiałów granulowanych. Obliczenia MES wykonano przy zastosowaniu mikropolarnego modelu hipoplastycznego. W obliczeniach DEM z kulami i momentami kontaktu zwrócono uwagę na zjawiska mikrostrukturalne w strefie ścinania na poziomie ziaren.

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• FE-investigations of a deterministic and statistical size effect in granular bodies within a micro-polar hypoplasticity

  Publication

  • J. Tejchman
  • J. Górski

  - GRANULAR MATTER - Year 2007

  Artykuł omawia deterministyczny i statystyczny efekt skali w materiałach granulowanych podczas ścinania cienkiej warstwy piasku między dwoma bardzo szorstkimi ścianami. Obliczenia wykonano metodą elementów skończonych na bazie mikropolarnego prawa hipoplastycznego. Przyjęto różne wysokości warstw.

• DEM analysis of micro-structural events within granular shear zones under passive earth pressure conditions

  Publication

  • M. Nitka
  • J. Tejchman
  • J. Kozicki
  • D. Leśniewska

  - GRANULAR MATTER - Year 2015

  W artykule omówiono wyniki obliczeń numerycznych dla pasku dla stanu pasywnego sztywnej ścianki podczas jej translacji stosując metodę elementów dyskretnych. Analizowano głównie zjawiska mikrostrukturalne w strefach ścinania podczas translacji sztywnej ścianki. Szczególna uwagę zwrócono na pojawienie się wirów w materiale granulowanym.

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• Contact force network evolution in active earth pressure state of granular materials: photo‑elastic tests and DEM

  Publication

  • L. Danuta
  • M. Nitka
  • J. Tejchman
  • M. Pietrzak

  - GRANULAR MATTER - Year 2020

  Artykuł omawia ewolucję sieci sił kontaktowych w materiałach granulowanych podczas quasi-statycznego stanu aktywnego. Doświadczenia foto sprężyste zostały wykonane dla kulek szklanych. Doświadczenia zostały symulowane stosując metodę elementów dyskretnych (DEM). Model DEM prawidłowo przewidział strukturę sił kontaktowych i ich wielkość, lokalizację odkształceń oraz obszary zmian fazowych.

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• Effect of free water on the quasi‑static compression behavior of partially‑saturated concrete with a fully coupled DEM/CFD approach.

  Publication

  • M. Krzaczek
  • J. Tejchman
  • M. Nitka

  - GRANULAR MATTER - Year 2024

  The work aims to numerically investigate the quasi-static response of partially fluid-saturated concrete under two-dimensional uniaxial compression at the mesoscale. We investigated how the impact of free pore fluid content (water and gas) affected the quasi-static strength of concrete. The totally and partially fluid-saturated concrete behavior was simulated using an improved pore-scale hydro-mechanical model based on DEM/CFD....

• Modelling of fracture process in concrete using a novel lattice model.

  Publication

  • J. Kozicki
  • J. Tejchman

  - GRANULAR MATTER - Year 2008

  Artykuł omawia wyniki modelowania procesu zarysowania w elementach betonowych przy zastosowaniu dyskretnego modelu kratownicowego. Beton był modelowany na poziomie mezoskali z uwzględnieniem 3 faz: kruszywa, zaczynu cementowego i stref kontaktu. Obliczenia wykonano dla rozciągania i ścinania połączonego z rozciąganiem.

• FE-calculations of stress distribution under prismatic and conical sandpiles within hypoplasticity

  Publication

  • J. Tejchman
  • W. Wu

  - GRANULAR MATTER - Year 2008

  W artykule przedstawiono wyniki numerycznej rozkładu naprężeń pod pryzmatycznymi i stożkowymi stosami piasku w ramach mikropolarnej hipoplastyczności. Wyniki pokazują, że rozkład naprężeń zależy od sposobu napełnienia stożku piaskiem. W niektórych przypadkach, maksymalne naprężenie nie występuje w środku stosu piasku.

• Modelling of concrete behaviour in uniaxial compression and tension with DEM.

  Publication

  • M. Nitka
  • J. Tejchman

  - GRANULAR MATTER - Year 2015

  W artykule omowiono wyniki modelowania betonu podczas jednoosiowego sciskania i rozciagania stosujac metode elementów dyskretnych. Beton zostal opisany jako material 3-fazowy (kruszywo, zaprawa cementowa i strefy kontaktu). Szczegolna uwage zwrocono na zjawiska mikro-strukturalne na poziomie kruszywa (lancuchy sil, wiry, obroty ziaren). Wyniki numeryczne zostaly porownano z wynikami badan doswiadczalnych.

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• FE-investigations of micro-polar boundary conditions along interface between soil and structure

  Publication

  • J. Tejchman
  • W. Wu

  - GRANULAR MATTER - Year 2010

  W artykule zaproponowano mikropolarne warunki brzegowe w strefie kontaktu materiału granulowanego ze ścianą konstrukcji. Warunki te umożliwiają wyznaczenie grubości strefy kontaktu w zależności od szorstkości ściany. Obliczenia wykonano przy zastosowaniu metody elementów skończonych i mikropolarnego modelu hipoplastycznego.

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• Effect of grain roughness on strength, volume changes, elastic and dissipated energies during quasi-static homogeneous triaxial compression using DEM

  Publication

  • J. Kozicki
  • J. Tejchman
  • Z. Mróz

  - GRANULAR MATTER - Year 2012

  Artykuł omawia wpływ szorstkości ziaren na wytrzymałość, zmiany objętościowe, sprężyste i dysypywane energie podczas jednorodnego quasi-statycznego trójosiowego ściskania. Obliczenia wykonano stosując metodę elementów dyskretnych. W obliczeniach zastosowano różne szorstkości ziaren.

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• Investigations of quasi-static vortex structures in 2D sand specimen under passive earth pressure conditions based on DEM and Helmholtz-Hodge vector field decomposition.

  Publication

  • J. Kozicki
  • J. Tejchman

  - GRANULAR MATTER - Year 2017

  Artykuł przedstawia wyniki obliczeń quasi-statycznych struktur wirowych w 2-wymiarowej próbce piasku w warunkach pasywnego parcia gruntu. Zastosowano metodę elementów dyskretnych i dekompozycję Helmholtza-Hodge’a pola wektorowego. Stwierdzono bliską zależność między wirami a miejscem powstania strefy lokalizacji odkształceń stycznych.

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• Meso‐scale analyses of size effect in brittle materials using DEM

  Publication

  • J. Suchorzewski
  • J. Tejchman
  • M. Nitka
  • J. Bobiński

  - GRANULAR MATTER - Year 2019

  The paper describes numerical meso-scale results of a size effect on strength, brittleness and fracture in brittle materials like concrete. The discrete element method (DEM) was used to simulate the size effect during quasi-static splitting tension with the experimental-based meso-structure. The two-dimensional (2D) calculations were carried out on concrete cylindrical specimens with two diameters wherein two different failure...

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• Particle shape dependence in 2D granular media

  Publication

  • C. Cegeo
  • B. Saint-Cyr
  • K. Szarf
  • C. Voivret
  • E. Azéma
  • V. Richefeu
  • J. Delenne
  • G. Combe
  • C. Nouguier-Lehon
  • P. Villard... and 3 others

  - EPL-EUROPHYS LETT - Year 2012

  Particle shape is a key to the space-filling and strength properties of granular matter. We consider a shape parameter eta describing the degree of distortion from a perfectly spherical shape. Encompassing most specific shape characteristics such as elongation, angularity and non-convexity, eta is a low-order but generic parameter that we used in a numerical benchmark test for a systematic investigation of shape dependence in sheared...

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• Application of the Anammox Process for Treatment of Liquid Phase Digestate

  Publication

  • J. Majtacz
  • D. Derwis
  • K. Czerwionka

  - Water - Year 2020

  The liquid phase of the digestate (LPD) contains a relatively high concentration of nitrogen, with total ammonium nitrogen being the dominant form of nitrogen, as well as other essential nutrients such as phosphorus and potassium. Consequently, it must be treated before it is released into the environment. However, there are no reports of co-purification of LPD in the anammox process in sequencing batch reactor with granular sludge,...

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• From flow to jamming: Lattice Gas Automaton simulations in granular materials

  Publication

  • M. Gaber
  • R. H. Ribeiro
  • J. Kozicki

  - POWDER TECHNOLOGY - Year 2024

  We introduce the first extension of a Lattice Gas Automaton (LGA) model to accurately replicate observed emergent phenomena in granular materials with a special focus on previously unexplored jamming transitions by incorporating gravitational effects, energy dissipation in particle collisions, and wall friction. We successfully reproduce flow rate evolution, density wave formation, and jamming transition observed in experiments....

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• MINERAL MATTER IN MUNICIPAL SOLID WASTE

  Publication

  • N. J. Śniadecka
  • A. Tonderski
  • A. Haenel
  • J. Wojda-Gburek
  • J. Hupka

  - Physicochemical Problems of Mineral Processing - Year 2016

  Municipal solid waste (MSW) contains mineral materials which are seldom considered as a potential resource. Currently, the waste management sector pays attention to recyclable parts, biodegradable material, waste-to-energy fraction, and residues after waste reuse and recycle. In contrast, this study focus as on the mineral matter in MSW. The aim was to analyze and discuss the sources of mineral matter in MSW, the impact which the...

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• Spetiation of organic matter in Vertical Flow Constructed Wetlands

  Publication

  • A. Lang
  • H. Obarska-Pempkowiak

  - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2009

  The object of the research were VFCWs which are a component of biological treatment of two hybrid hydrophyte systems located in Wieszyno and Wiklino, close to Słupsk, Poland. The facilities that are subject to analyses are unified in terms of structure (filtration material, depth of the bed and time of operation), but they differ in organic matter load, amounting respectively to: 8.0 gCOD/m2day and 31.0 gCOD/m2day.The intensity...

• Influence of grain shape on the mechanical behaviour of granular materials

  Publication

  • K. Szarf
  • G. Combe
  • P. Villard

  - Year 2009

  We performed series of numerical vertical compression tests on assemblies of 2D granular material using a Discrete Element code and studied the results in regard to the grain shape. The samples consist of 5000 grains made either of 3 overlapping discs (clump - grain with concavities) or of six-edged polygons (convex grain). These two types of grains have a similar external envelope, ruled with a geometrical parameter α. In the...

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• Impact of soluble organic matter and particulate organic matter on anammox system: Performance, microbial community and N2O production

  Publication

  • Y. He
  • H. Mao
  • J. Mąkinia
  • J. Drewnowski
  • B. Wu
  • J. Xu
  • L. Xie
  • X. Lu

  - JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA - Year 2023

  In this study, the effects of soluble readily biodegradable COD (sCOD) and particulate slowly biodegradable COD (pCOD) on anammox process were investigated. The results of the longterm experiment indicated that a low sCOD/N ratio of 0.5 could accelerate the anammox and denitrification activity, to reach as high as 84.9% ±2.8% TN removal efficiency. Partial denitrification-anammox (PDN/anammox) and denitrification were proposed...

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• Structured deformation of granular material in the state of active earth pressure

  Publication

  • L. Danuta
  • A. Tordesillas
  • M. Pietrzak
  • S. Zhou
  • M. Nitka

  - COMPUTERS AND GEOTECHNICS - Year 2023

  The paper focuses on the ability of granular materials to undergo structured deformation by analysing the data from the retaining wall model tests and discrete element simulations. The structured deformation means the movement of a granular material which produces a stable, regular pattern of multiple shear bands. The paper's primary purpose is to study this kind of deformation for the selected data representing the state of active...

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• Mineral and Organic Matter Constituents in Weak Interfaces in Shales

  Publication

  • A. Małachowska
  • J. Hupka
  • S. Green
  • R. Suarez-rivera

  - Year 2016

  This paper identifies formation interfaces that would appear to be "weak interfaces", in the Jurassic, Early- Cretaceous Vaca Muerta formation, in the Neuquén Basin, Argentina. Significant distribution of the weak interfaces was observed including contacts between volcanic ash layers of varying thicknesses, calcite-filled veins, and contacts between lithology changes, such as between argillaceous mudstone and mottled carbonates....

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• Influence of nitrogen and organic matter fractions on wastewater treatment in treatment wetland

  Publication

  • M. Gajewska

  - Year 2013

  Municipal wastewater contains both biodegradable and non-degradable pollutants. Moreover, they are present in dissolved, colloidal and particulate forms. These fractions are characterised by various decomposition rates, hence their bioavailability during microbial respiration. It was confirm that biological degradation rate in terms of COD reduction is influenced by particle size speciation. Therefore, the objective of the study...

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• Chracteristics of anaerobic ammonium oxidation initated by anaerobic granular sludge

  Publication

  • M. Hong-yu
  • X. Li
  • L. Xi
  • Y. Zi
  • J. Drewnowski

  - Chinese Journal of Environmental Engineering - Year 2021

  Two different mixed sludge, anaerobic granular sludge(Ｒ1) and anaerobic granular sludge with mature anaerobic ammonium oxidation (ANAMMOX) sludge (Ｒ2 )were used as the inocula in two up-flow reactors to enrich anaerobic ammonia-oxidizing bacteria (AnAOB)，respectively．The total nitrogen removal rate of Ｒ1 reached 74% in 99 days, while Ｒ2 remained above 70% in only 48 days．The content of extracellular polymeric substance (EPS) in...

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• Influence of the grains shape on the mechanical behavior of granular materials

  Publication

  • K. Szarf
  • G. Combe
  • P. Villard

  - Year 2009

  Discrete Element Method is a numerical method suitable for modeling geotechnical problems concerning granular media. In most cases simple forms of grains, like discs or spheres, are used. But these shapes are capable of soil behavior modeling up to a certain point only, they cannot reflect all of the features of the medium (large shear resistance and large volumetric change). In order to reflect the complex behavior of the real...

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• PARTICLE SIZE ANALYSIS OF SUSPENSIONS IN REMOVING OF ORGANIC MATTER AND PHOSPHORUS FROM WASTEWATER AND SURFACE WATER

  Publication

  • A. Lang
  • K. Kołecka

  - Architecture Civil Engineering Environment - Year 2012

  In this paper the particle size of suspended solids in the removing of organic matter and phosphorus compounds from lake water and wastewater treated in the Ecological Treatment Systems (ETS) was analyzed. The invesigated materials were taken from two ETS located in Pomerania Region/Poland. Object in Swarzewo is 3rd stage of biological treatment of municipal wastewater, while object in Kartuzy has task to remove a phosphorus from...

• Comparative modeling of shear localization in granular bodies with FEM and DEM

  Publication

  • Ł. Widuliński
  • J. Kozicki
  • J. Tejchman

  - Year 2010

  The intention of the paper is to compare the calculations of shear zones in granular bodies using two different approaches: a continuum and a discrete one. In the first case, the FEM based on a micro-polar hypoplastic constitutive law was used. In the second case, the DEM was taken advantage of, where contact moments were taken into account to model grain roughness. The comparative calculations were performed for a passive case...

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• Mercury in suspended matter of the Gulf of Gdańsk: Origin, distribution and transport at the land–sea interface

  Publication

  • A. Jedruch
  • U. Kwasigroch
  • M. Bełdowska
  • K. Kuliński

  - MARINE POLLUTION BULLETIN - Year 2017

  The coastal regions of inland seas are particularly vulnerable to Hg pollution. An important carrier of toxic Hg in the marine environment is suspended matter originating from multiple sources. The present study was conducted in the Gulf...

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• Challenges in QCD matter physics --The scientific programme of the Compressed Baryonic Matter experiment at FAIR

  Publication

  • T. Ablyazimov
  • A. Abuhoza
  • R. Adak
  • M. Adamczyk
  • K. Agarwal
  • M. Aggarwal
  • Z. Ahammed
  • F. Ahmad
  • N. Ahmad
  • S. Ahmad... and 578 others

  - EUROPEAN PHYSICAL JOURNAL A - Year 2017

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• Application of the expanded clay aggregate in form of granular materials for water treatment

  Publication

  • J. Drewnowski
  • G. Łagód

  - Year 2017

  The paper aimed to evaluate the efficiency of Filtralite MonoMulti compared to the conventional dual-media filter beds comprising silica sand layer covered with anthracite coal. Filtralite media are composed of processed (expanded), highly porous clay products characterized by relatively rough grain surfaces. In order to compare these different media filters in a reliable way, the pilot filter columns operated in parallel, under...

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• Front Matter: Volume 8703

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2013

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• Front Matter: Volume 7502

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2009

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• Front Matter: Volume 8454

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2012

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• Front Matter: Volume 8010

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2011

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• Front Matter: Volume 8702

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2013

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• Front Matter for Volume 7745

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2010

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• Front Matter: Volume 9290

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2014

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• Front Matter: Volume 8008

  Publication

  • P. SPIE
  • R. S. Romaniuk

  - Year 2011

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• Quantification of ultrafine airborne particulate matter generated by the wear of car brake materials

  Publication

  • O. Nosko
  • U. Olofsson

  - WEAR - Year 2017

  The wear of car brakes is one of the main sources of airborne particulate matter in urban environments. Ultrafine wear particles are of special environmental interest since they can easily penetrate the human body through inhalation and cause various diseases. In the present study, the contribution of ultrafine particles to airborne particulate matter emitted from car brake materials was investigated under different friction conditions....

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• Use of radiography images and gray level co-occurrence matrix to investigate gravitational granular flow

  Publication

  • S. Waktola
  • K. Grudzień
  • M. Niedostatkiewicz
  • L. Babout

  - MATEC Web of Conferences - Year 2018

  The paper presents analysis of granular gravitational flow based on radiography images processing. The investigations were conducted for silo model geometry with concentric/eccentric discharging modes. The continuous X-ray radiography scans of granular material distribution, acquired during flow, were obtained by means of an especially designed model silo with rectangular bin and different settings of hopper angles. Image processing...

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• Removal of organic matter and nitrogen in an horizontalsubsurface flow (HSSF) constructed wetland undertransient loads

  Publication

  • A. Albuquerque
  • M. Arendacz
  • M. Gajewska
  • H. Obarska-Pempkowiak
  • P. Randersoen
  • P. Kowalik

  - WATER SCIENCE AND TECHNOLOGY - Year 2009

  A monitoring campaign in a horizontal subsurface flow constructed wetland under the influence of transient loads of flow-rate, organic matter, nitrogen and suspended solids showed an irregular removal of COD and TSS and lower both removal efficiencies and mass removal rates than the ones observed in other studies for similar operating conditions. This circumstance is associated to the presence of large amount of particulate organic...