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Computational Fluid Dynamics Approach for Predicting Pipeline Response to Various Blast Scenarios: A Numerical modeling Study

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computer modeling in Engineering & Sciences 2024年第9期140卷 2747-2777页

作者： Farman Saifi Mohd Javaid Abid Haleem S.M.Anas Department of Mechanical Engineering Jamia Millia Islamia(A Central University)New Delhi110025India Department of Civil Engineering Jamia Millia Islamia(A Central University)New Delhi110025India

Recent industrial explosions globally have intensified the focus in mechanical engineering on designing infras-tructure systems and networks capable of withstanding blast *** centered on high-profile facilities such as embassies and petrochemical plants,this concern now extends to a wider array of infrastructures and *** and scholars increasingly prioritize structural safety against explosions,particularly to prevent disproportionate collapse and damage to nearby *** has further amplified the reliance on oil and gas pipelines,making them vital for urban life and prime targets for terrorist ***,there is a growing imperative for computational engineering solutions to tackle blast loading on pipelines and mitigate associated risks to avert *** this study,an empty pipe model was successfully validated under contact blast conditions using Abaqus software,a powerful tool in mechanical engineering for simulating blast effects on buried *** a Eulerian-Lagrangian computational fluid dynamics approach,the investigation extended to above-surface and below-surface blasts at standoff distances of 25 and 50 *** descriptions in the numerical model relied on Abaqus’default mechanical *** analysis revealed varying pipe performance,with deformation decreasing as explosion-to-pipe distance *** explosion’s location relative to the pipe surface notably influenced deformation levels,a key finding highlighted in the ***,quantitative findings indicated varying ratios of plastic dissipation energy(PDE)for different blast scenarios compared to the contact blast(P0).Specifically,P1(25 mm subsurface blast)and P2(50 mm subsurface blast)showed approximately 24.07%and 14.77%of P0’s PDE,respectively,while P3(25 mm above-surface blast)and P4(50 mm above-surface blast)exhibited lower PDE values,accounting for about 18.08%and 9.67%of P0’s PDE,***

关键词： Blast loading computational fluid dynamics computer modeling pipe networks response prediction structural safety

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Multicompartment Micelles From π-Shaped ABC Block Copolymers

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Chinese Journal of Chemistry 2007年第11期25卷 1732-1738页

作者：夏俊仲崇立 Beijing Key Laboratory of Bioprocess Department of Chemical Engineering Beijing University of Chemical Technology Beijing 100029 China

Dissipative particle dynamics simulations were performed on the morphology and structure of multicompartmerit micelles formed from n-shaped ABC block copolymers in water. The influences of chain architectures were studied in a systematic way, and a rich variety of morphologies were observed, such as spherical, wormlike, X-shaped, Y-shaped, ribbon-like, layered rod-like, layered disk-like, as well as network morphologies. The simulations show that the distance between the two grafts plays an important role in control of the morphology. Since n-shaped ABC block copolymers can be reduced to linear ABC and star ABC block copolymers, they are good model copolymers for studying the self-assembly of complex block copolymers into micelles. The knowledge obtained in this work as well as the new morphologies identified provide useful information for future rational design and synthesis of novel multicompartment micelles.

关键词： dissipative particle dynamics multicompartment micelle n-shaped block copolymer computer modeling

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Simulation of the Traweling Wave Burning Regime on Epithermal Neutrons

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World Journal of Nuclear Science and Technology 2023年第4期13卷 73-90页

作者： Viktor Tarasov Serhiy Chernezhenko Iryna Korduba Volodymyr Vashchenko Department of Theoretical and Experimental Nuclear Physics Odessa National Polytechnic University Odesa Ukraine Department of Environmental Protection Technologies and Labor Protection National University of Construction and Architecture Odesa Ukraine Interdepartmental Scientific Center for Fundamental Research on Energy and Ecology of the National Academy of Sciences of Ukraine “Odesa Polytechnic” and Ministry of Ecology Odessa Ukraine

New results of two computer experiments on modeling of superthermal neutron-nuclear combustion of natural uranium for two different flux densities of external neutron source and duration of half a year each are presented. The simulation results demonstrate the dependence of the autowave combustion modes on the parameters of the external source.

关键词： Wave Reactor computer modeling Neutron Nuclear Combustion Neutron Thermal Spectrum Natural Uranium Combustion

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Stochastic Simulation and Analysis of Geological Corrosion Defects in Dam Foundation

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Transactions of Tianjin University 2016年第4期22卷 324-333页

作者：王超张社荣于茂 School of Civil Engineering Tianjin University State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University

Uncertainty in geological structural modeling, especially geological corrosion(a kind of karst cave), is a bottleneck that restricts the development and application of geological computer modeling and effect estimation. To solve this issue, a stochastic modeling method based on the random field theory is proposed in comparison with the deterministic geometric modeling method. Then the constraint random field modeling method and the random field modeling method without constrained parameters are compared and analyzed. A case study shows that the novel stochastic simulation method is an effective tool to describe the distribution characteristics of corrosion parameters and reflect the updated geological prospecting information. The influence of geological corrosion on the dam behavior can also be better analyzed by using the stochastic simulation method. At the same time, the unconfined random field ignores the sample location information and may lead to higher variability. Therefore, the constraint random field modeling method can provide a useful reference for the numerical analysis under complex geological conditions.

关键词： hydraulic structure computer modeling geological corrosion stochastic simulation random field theory

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modeling Reality: How computers Mirror Life

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2004年

作者： Iwo Bialynicki-Birula Iwona Bialynicka-Birula

ISBN: (数字)9780191713033

ISBN: (纸本)9780198531005

This book covers a wide range of subjects concerning the use of computer modeling to solve a diverse set of problems. The book covers some advanced topics (cellular automata, Shannon measure of information content, dynamical systems, deterministic chaos, fractals, statistical linguistics, game theory, neural networks, genetic algorithms, Turing machines, and artificial intelligence). These advanced subjects are explained in terms of well known simple concepts such as the Game of Life, probability and statistics, Galton's board, Shannon's formula, game of twenty questions, game theory, and a format similar to a television quiz. Twenty-five programs written specifically for the book greatly enhance its pedagogical value and the enjoyment of learning. These can be found at http://***/.

关键词： computer modeling game theory statistical linguistics dynamical systems cellular automata fractals genetic algorithms neural networks

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An estimate of the conversion rates of SO_2 to SO_4^(2-)- and NO_2 to HNO_(3+) NO_3^- for the evaluation air pollution in Beijing

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Journal of Environmental Sciences 1990年第1期2卷 41-48页

作者： Kazuhiko Sakamoto Katsunori Kimijima Tadao Suzuki Masahiro Uchiyama Yoshikazu Hashimoto Hisao ohta Yasuaki maeda Nobutoshi Horiuchi Shin Suzuki Saitama University Japan.Saitama University Japan.Automobile Research Institute Japan.The National Institute Environmental Sciences Japan.Keio University Japan.Chiba Environmental Protection Association Japan.Osaka Prefectural University Japan.Chiba University Japan.Chiba University Japan.

The conversion rates of SO2 to SO42- and NO2 to HNO3+NO3- are estimated from the field-data obtained in Beijing in summer, 1988. The results show that the conversion rate of NO2 is about four times as much as that of SO2; The conversion rates have a diurnal variation in a day. On the average, the rate of SO2 is estimated to be 4.7% h-1 during the daytime and 3.4% h-1 during the nighttime. Similarly, the rate of NO2 is estimated to be 17.2% h-1 and 12% h-1 respectively.

关键词： sulphur dioxide nitrogen oxide computer modeling conversion rate oxidation.

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Optimum Kinetic Parameters of Mefenamic Acid Crystallization by PBM

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Journal of Crystallization Process and Technology 2012年第3期2卷 81-95页

作者： Serap Cesur Cihan Yaylaci Engineering Faculty Chemical Engineering DepartmentEge UniversityBornovaTurkey.

Mefenamic acid (MA) is a high-dose, anti-inflammatory, analgesic agent that is widely prescribed for pain related to menstrual disorders. It has some negative properties, such as a high hydrophobicity with a propensity to stick to surfaces, and possess great problems during granulation and tableting. Crystallization kinetics was investigated for mefenamic acid. Availability of data on the kinetics of crystal growth is very important for the development and operation of industrial crystallisation processes. The experiments for the measurement of crystal growth kinetics were carried out using the desupersaturation curve technique based on the measurement of the solution concentration versus time in a seeded isothermal batch experiment. To predict the optimum parameters (b, kb, g, kg) for the nucleation and growth kinetics from the desupersaturation curve obtained, the Population Balance Modelling was used and solved by the method of moments. The initial values for the optimisation problem were estimated by using the approach developed by Garside et al. (1982) [1].

关键词： Industrial Crystallization Recrystallization Mefenamic Acid Crystal Growth from Solutions Crystallization in Solutions of Macromolecules computer modeling Simulation

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EFFECT OF MIXING INDUSTRIAL AND DOMESTIC WASTEWATER ON SETTLING BEHAVIORS IN PRIMARY SETTLING TANKS

EFFECT OF MIXING INDUSTRIAL AND DOMESTIC WASTEWATER ON SETTL...

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Sixteenth International Water Technology Conference

作者： Atta N.N. El Mokadem S. El Monayeri O.D. EL Gohary E.H. Dept.of Environmental Engineering Faculty of Engineering Zagazig University Dept.of Construction ＆ Building Engineering Faculty of Engineering The Arab Academy for Science ＆ Technology ＆ Marine Time Transportation

About 50 % of the industries in Egypt, on statistical analyses done for 37 industries in Egypt, violate the Egyptian environmental law and discharge their untreated effluents into public sewage network. This had lead to the obvious deterioration of the sewage network, pumping stations, settling tanks, the biological activity during treatment in WWTPs and threatening the aquatic life in streams and rivers. 10 th of Ramadan city is considered to be the largest industrial city in Egypt. In this city the industrial WW is mixed with domestic sewage at the existing treatment plant. Currently, the efficiency of TSS removal in primary settling tanks（PST, during 2010） ranged from 30% to 45% compared to international standards（50% to 70%, Metcalf ＆ Eddy, 2003）. Another case includes Abu Rawash WWTP, which receives domestic WW only, the efficiency of TSS removal in PST ranged from 50% to 65 %. There is a clear reduction in the removal efficiency of TSS in PST in case of 10 th of Ramadan city WWTP due to the mixing of industrial and domestic WW despite that the operational parameters（Retention time and Surface loading rate） coincide with those in the international standards. The reduction in the removal efficiency of primary treatment should affect the organic and solid loading rates on the subsequent treatment units. The present study aims to re-establishment the settling behaviors and operation of PST which receive raw and combined domestic and industrial wastewaters（with different mixing ratios）. This has been done using laboratory batch settling column tests. Results have been validated using computer modeling（GPS-X）. Experimental investigations of this study showed that, at a RT of（1.5-2.5 hr）, and a SLR of（30 – 50 m/d）, the removal efficiency of TSS ranged between 51 and 61% for Domestic WW, from 35 to 45% for Industrial WW, from 45 to 56% for mixed WW（25% industrial）, and from 40 to 50% for mixed WW（50% industrial）.

关键词： batch settling computer modeling domestic ww flocculent settling GPS-X industrial ww primary sedimentation tank TSS removal

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In silico systems evaluation of drug-induced cardiotoxicity

In silico systems evaluation of drug-induced cardiotoxicity

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第二次全国计算毒理学学术会议暨中国毒理学会第一届计算毒...

作者： Pan Li Li Zhang Chao Wang Ping'an Zhao Center for Public Health Informatics School of Public HealthXinxiang Medical University

Drug-induced cardiotoxicity,*** lethal arrhythmia Torsade de Pointes(TdP),has been recognized as a critical issue since the very early stage of drug design and ***,unexpected post-marketing occurrence of cardiotoxic e... 详细信息

关键词： Cardiotoxicity CiPA computer modeling Arrhythmias

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A virtual model of the retina based on histological data as a tool for evaluation of the visual fields

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Annals of Eye Science 2017年第1期2卷 113-126页

作者： Francisco-Javier Carreras Ángel V.Delgado José.L.García-Serrano Department of Surgery Medical School2Department of Applied PhysicsSchool of SciencesUniversity of GranadaGranadaSpain Hospital Clínico San Cecilio University of GranadaGranadaSpain School of computer Science Department of Computer Science and Artificial IntelligenceUniversity of GranadaGranadaSpain

Background:To settle the fundamentals of a numerical procedure that relates retinal ganglion-cell density and threshold sensitivity in the visual *** sensitivity of a generated retina and visual pathways to virtual stimuli are simulated,and the conditions required to reproduce glaucoma-type defects both in the optic-nerve head(ONH)and visual fields are ***:A definition of selected structural elements of the optic pathways is a requisite to a translation of clinical knowledge to computer programs for visual field *** program is able to generate a database of normalized visual *** relationship between the number of extant receptive fields and threshold sensitivity is plotted for background sensitivity and corresponding automated perimetry.A solution in two planes to the 3D distribution of axons in the ONH is *** fields with induced damage in the optic disc are comparable in pattern and quantity to glaucomatous ***:The two-level simulation of the ONH facilitates the analysis of optic-cup/retinal *** can generate the virtual optic pathways tailored to the age and morphology of the patient’s eye,and it is possible to reproduce glaucomatous damage by“reverse engineering”*** virtual cortical model renders a quantitative relationship between visual defect and neural ***:A two-level computing of the retina/optic nerve facilitates the analysis of neuroretinal defects and can be incorporated to automatic perimeters to facilitate visual field analysis.

关键词： computer modeling early optic pathways neuroretinal defects threshold sensitivity visual fields

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