bluuebunny/crossref_metadata_2025_split huggingface dataset:
Microscopic mechanical model of the main structural element of Bazhenov Suite reservoir rocks
Authors: Grigoriev A S , Shilko E V , Psakhie S G , Kontorovich A E 
Published: July 2019

Abstract
We propose a microscale model of the main structural element (“bearing” layers) of kerogen-clay-carbonate-siliceous rocks of the Bazhenov formation. The model treats the rock as a composite material with inorganic clay matrix and different content of organic inclusions (up to 25%) and micropores filled with low-viscous fluid (light hydrocarbon fractions). A computer simulation of the mechanical behavior of representative samples of structural elements of the studied rock under triaxial compression was carried out using the hybrid cellular automaton method and a coupled mechanical model that takes into account the mutual influence of porous rock deformation and filtration of a pore fluid. It is shown that the mechanical behavior of the “bearing” layer of rock at side pressures that meet the characteristic conditions of occurrence is satisfactorily described by rock plasticity models with two-parameter flow functions.
Linear stability of a supersonic boundary layer on a plate under conditions of vibrational excitation and of viscous stratification
Authors: Grigoryev Y N , Ershov I V 
Published: July 2019

Abstract
An asymptotic theory of the neutral stability curve for a supersonic boundary layer of a vibrationally excited molecular gas on a plate is developed. The initial mathematical model of flow consists of equations of two-temperature viscous heat-conducting gas dynamics, which are used to derive a spectral problem for a linear system of eighth-order ordinary differential equations within the framework of the classical linear stability theory. Unified transformations of the system for all shear flows are performed in accordance with the classical Lin scheme. The problem is reduced to an algebraic secular equation with separation into the inviscid and viscous parts, which is solved numerically. It is shown that the thus-calculated neutral stability curves agree well with the previously obtained results of the direct numerical solution of the original spectral problem. In this case, the critical Reynolds number increases with excitation enhancement of the internal degrees of freedom of molecules, and the neutral stability curve is shifted toward the domain of higher wave numbers. This is also confirmed by means of solving an asymptotic equation for the critical Reynolds number.
Choice of boundary conditions at the unsteady modeling of jets flowing into the supersonic flow
Authors: Zamuraev V P , Kalinina A P , Popova D S , Fedorova D V , Ivanova O N 
Published: July 2019

Abstract
Numerical simulation of ignition of the gas mixture not mixed previously in the supersonic flow localized in a channel was performed. The ignition is initiated by the shock wave from the throttling jet, which results in significant changing of pressure difference between the main flow and the gas generator of the throttling jet. It is shown that applying boundary conditions similar to the breakdown of arbitrary discontinuity conditions, makes it possible to obtain the transonic mode observed in the experiment. The near-wall and axisymmetric supply of the gaseous fuel was considered.
Growth of nonlinear structures on the interface between dielectric liquids in a strong vertical electric field
Authors: Kochurin E A , Zubareva O V , Zubarev N M 
Published: July 2019

Abstract
Nonlinear dynamics of the interface between dielectric liquids exposed to a strong vertical electric field is studied. Two types of exact solutions for quadratically nonlinear equations of motion (periodic solutions involving a finite number of Fourier harmonics and spatially localized rational solutions) are analyzed. Description of the interfacial evolution reduces to solving a finite number of ordinary differential equations either on amplitudes of harmonics, or, through the analytical continuation into the complex plane from the interface, for the poles motion. The common property of the solutions is a tendency for the growth of interface perturbations in the direction of the liquid with a lower permittivity.
Deformation of T-shaped beams under creep conditions with different properties in tension and compression
Authors: Iyavoynen S V 
Published: July 2019

Abstract
An algorithm is implemented to simulate a pure bending of a beam of a symmetric section under creep conditions. The beam is subjected to a bending moment with a constant absolute value. The algorithm is applied to the experimental data on the pure bending of T-beams made from a Ti-Al-Sn-V alloy at a temperature T = 700°C. The algorithm takes into account the accumulation of damage in the material, the effect of temperature exposure and the difference properties of the material under tension and compression. The model is based on kinetic creep theory by Rabotnov. The Nelder-Mead procedure is used to find the bending moment by the curvature of a beam.
Comparison of design optimization algorithms of a multiply fractured horizontal well
Authors: Kavunnikova E A , Starovoitova B N , Golovin S V , Krivtsov A M 
Published: July 2019

Abstract
The paper is devoted to comparison of multiple-objectives optimization algorithms in application to the problem of design optimization of a multiply fractured horizontal well (MFHW). The problem is stated either as a single-objective one, where only the income based on Net Present Value (NPV) is maximized, or as a multi-objective problem, where it is necessary to simultaneously find extremes of NPV, the post-fracture oil production and fracturing costs. Three popular stochastic optimization methods are considered: genetic algorithms (GA), simulated annealing (SA) and particle swarm optimization (PSO). Since PSO, SA and GA techniques employ different strategies and computational efforts, the comparison of their efficiency was carried out by testing on synthetic problems and then applied to the example of a MFHW in a low-permeable oil reservoir.
A one-velocity model of suspension flow through a high-porous medium
Authors: Leontiev N E 
Published: July 2019

Abstract
A one-velocity model for slow flows of a suspension through a high-porous medium is proposed. The model involves the momentum equation (Brinkman equation) and two continuity equations for the suspension and suspended particles. The particle migration due to spatially varying frequency of particle-matrix collisions is heuristically accounted for. As other known diffusion models, the proposed one is not universal and is valid only for simple flow patterns (e.g., shear flows). A generalization of the proposed model for deep bed filtration is also given.
Two-dimensional stationary flow of two immiscible fluids in a cylinder taking into account the internal energy of the interface
Authors: Andreev V K , Magdenko E P 
Published: July 2019

Abstract
In this paper, the problem of a two-dimensional stationary flow of two immiscible viscous heat-conducting fluids in a cylinder is solved. The fluids have a common movable non-deformable interface. The cylinder has a solid outer wall. At the same time the mass forces are absent. The total energy condition at the interface is taken into account. The temperature in liquids is distributed in a quadratic law, which is consistent with the velocity field of the Himenz type. From a mathematical point of view, this initial-boundary value problem is nonlinear and inverse with respect to pressure gradients along the cylinder axis. The modified Galerkin method is used to solve the problem. The effect of the Marangoni number on the fluids flow is investigated.
Solvability of the system of equations of one-dimensional movement of a viscous liquid in a deformable viscous porous medium
Authors: Tokareva Margarita , Papin Alexander 
Published: July 2019

AbstractThe initial-boundary value problem for the system of one-dimensional motion of viscous liquid in deformable viscous porous medium is considered. Local theorem of existence and uniqueness of problem is proved in case of compressible liquid. In case of incompressible liquid the theorem of global solvability in time is proved in Hölder classes.
Effect of current on wave resistance of an Air Cushion Vehicle
Authors: Pogorelova A V , Kozin V M 
Published: July 2019

Abstract
The unsteady movement of the Air Cushion Vehicle on an ice cover in the presence of uniform current is considered. The ice cover is modelled as an elastic plate, floating on the surface of water of finite depth. Air Cushion Vehicle is modelled by the area of pressure moving with a variable speed. The effect of current on wave resistance of Air Cushion Vehicle is analyzed. It is received that the transverse current has little effect on the wave resistance. The longitudinal current leads to significant change of wave resistance on the modes of the accelerated movement for attainment of critical speed and decelerating from critical speed to a full stop. For uniform motion of vehicle the critical velocity increases for following current and decreases for opposing current.
About counter concurrent flows with general conjugation conditions
Authors: Markov V G , Popov S V 
Published: July 2019

Abstract
The article [1] is devoted to the conjugation problems for different physical processes such as the heat propagation in nonhomogeneous media, diffraction type problems, interaction of filtration and channel flows of a fluid, filtration in a borehole, reverse flows in a boundary layer after a separation point, etc. These conjugation problems are supplemented with examples of their realization including existence and uniqueness theorems of the corresponding boundary value problems. In the present article we consider counter concurrent flows with general conjugation conditions in the conjugation models and contact boundary value problems proposed.
Modelling of process of displacement of methane from gas hydrate reservoir at dioxide carbon injection
Authors: Rafikova G R , Khasanov M K 
Published: July 2019

Abstract
The paper presents a mathematical model for describing the process of displacing methane with carbon dioxide from a reservoir saturated with methane and its hydrate. For gas substitution kinetics, a scheme has been proposed in which the intensity of the process is defined by the diffusion of carbon dioxide through the hydrate layer formed between the gas mixture flow and methane hydrate. The numerical research of influence of main parameters on dynamics of process is conducted. Influence of coefficient of diffusion mixing of the gas mixture and permeability for the time of complete gas-replacement in reservoir is studied.
Vortex flow on the wing of aircraft and flow control to improve lift properties
Authors: Mamonova E E , Soudakov V G , Voyevodin A V 
Published: July 2019

Abstract
A high-lift configuration of the civil aircraft including body, wing in high-lift configuration, nacelle with pylon and empennage is considered in the present work. Numerical simulations of the flow have been carried out in the framework of Reynolds averaged Navier-Stokes (RANS) equations for low subsonic Mach number. The active flow control method, which is capable to improve maximal lift of the aircraft, has been considered. The influence of jet blowing near wing-body junction on aerodynamic characteristics has been investigated.
Simulation of flows with breaking internal waves generated by an obstacle
Authors: Yakovenko S N , Gavrilov N V 
Published: July 2019

Abstract
Numerical study of a stably stratified flow with obstacle of different shapes is performed by means of the Navier–Stokes and scalar equations for incompressible fluid with the Boussinesq approximation of buoyancy effects. The results of computations agree well with the concurrent experiment study with the towed body in the water tank with pycnocline.
Is flash flood cycle? A preliminary climate study on Teunom fluvial system
Authors: Irham M , Ilhamsyah Y , Sugianto  , Deli A , Syahreza S 
Published: July 2019

Abstract
The atmospheric dynamics in the Teunom region have caused flashflood several times in last decade, especially in the Krueng Tenom river basin. This problem has been speculated for many scientists who predicted that such flashflood were caused by either regional climate change or the uncontrolled land use in this area. However, it should also be understood the possibility that flash floods may be caused by regional atmospheric cycle. Therefore, this study aims to understand how the climate approach on temperature and rainfall as meteorology process as a way to comprehend whether the flashflood cycle. The result of the research shows that flashflood is actually cyclical, however, due to micro climate change that happened and it is predicted that land use change or land conversion and illegal mining accelerates flashflood cycle so that early warning system is difficult to be implemented.
Greater Aceh, Indonesia Enters Climate Change: Climate on Extreme ENSO 2015-2016
Authors: Ilhamsyah Y , Farhan A , Irham M , Setiawan I , Haditiar Y , Irwandi  
Published: July 2019

AbstractThe objective of the study is to analyse the rainfall variability and temperature over Greater Aceh and its correlation to ENSO event. Long-term rainfall observation data spanning from 1982-2018 was retrieved from meteorological station of Blang Bintang, Greater Aceh. The Pearson correlation was employed to find the relationship between rainfall and El Niño and Southern Oscillation (ENSO) occurrence. It is shown from frequency analysis that rainfall decreased in the 90s. After the tsunami as climate change become unequivocal the rainfall trend increase as a result of land use change and much worst as severe ENSO 2015 arrived over the region which statistically significant was found between those two corresponding events. During El Niño, rainfall is less while La Niña more rainfall than normal drop over the region. To cope with climate change issues where ENSO is very likely to occur in future time, an appropriate mitigation is required to conduct for instance: managing forest resources and land use by reducing deforestation and land conversion, the control of fossil fuel burning, and the most important thing is to establish a renewable energy as an effort to implement sustainable green energy in the future as well as climate risk reduction.
Identification of Paths and Places of Tsunami Evacuation Based on P646 Fema for Tourism Beaches in the Regency of Gunungkidul, Yogyakarta
Authors: Sarwidi  , Aji Limpat , Satyarno Iman 
Published: July 2019

Abstract
The maximum number of monthly visitors to the tourism coasts in Gunungkidul Regency between 2012 and 2015 is 25,160 people. Those Indian Ocean beaches that are in the southern sides of the Island of Java are prone to tsunami disaster. However, there were no systematic and scientific study to make analysis of the tsunami disaster mitigation to those tourism beaches. Therefore, a series of policies with comprehensive rescue strategies and efforts to minimize the risk of the tsunami disaster is required. The purpose of this study is to identify the paths and places of tsunami evacuation for the tourism beaches in Gunungkidul Regency based on P646 of FEMA (Federal Emergency Management Agency) and compare them with the result of the identification of paths and places of tsunami evacuation conducted by BPBD (Local Disaster Management Authority) of Gunungkidul Regency, Yogyakarta. This purpose also includes the want of the authors to implement the method of this study to be the policy of tsunami mitigation for similar tourism beaches in the Special Territory of Yogyakarta as well as similar beaches in Indonesia. This study uses quantitative method with descriptive analysis technique that is analyzing the paths and places of tsunami evacuation based on P646 of FEMA. Given location elevation is the basic ingredient of the analysis, and therefore, elevation data, tsunami arrival time, projected number of visitors to support the analysis need to be gathered. The analysis of the evacuation areas is required to determine the evacuation places that are safe points in the evacuation process. An elevation of a safe point elevation can be a point that is beyond the reach of tsunami waves or safe areas within the tsunami pool areas. The results of this study are the height of the gathering point / safe point 25 meters above sea level to be the basis for saving themselves, if connected with the speed of walking (weak condition), then the arrival time / arrival time of the tsunami is not more than 0.5 hours. This is still within limits in accordance with the Federal Emergency Management Agency (FEMA P-646, 2008), the location of the gathering point / tsunami evacuation safe point can be used as the first rescue of tsunami victims by considering the arrival time of the tsunami. On the other hand, BPBD accommodate tsunami victims using public facilities even though they are far away and heed the arrival time of the tsunami.
Adaptive Urban Design Principles for Land Subsidence and Sea Level Rise in Coastal Area of Tambak Lorok, Semarang
Authors: Akbar I , Poerbo H W , Soedarsono W K 
Published: July 2019

Abstract
In recent years, the upward trend of sea level rise caused by climate change continues to increase. This condition threatens urbanization that occurs in urban areas, especially in coastal area. Coastal is a strategic location for various activities such as ports, recreation, fisheries and agriculture, but it is vulnerable to changes caused by community and natural activities. Semarang is one of the coastal city located in the north of Central Java. Dense and slum settlements are dominating the coastal area of Semarang, one of them is fisherman’s settlement in Tambak Lorok. This area has been undergoing land subsidence for a long time and is now threatened by sea level rise due to climate change. The purpose of this study is to formulate adaptive urban design principles on land subsidence and sea level rise in Tambak Lorok, Semarang. This study is carried out with qualitative method using the approach of research and development in building a formula that applies to the conditions formed by land subsidence and sea level rise. The design principles formulated from this study are general principles that serve as guidelines for designing coastal areas that adaptive to land subsidence and sea level rise. We believe, the adaptation of urban space can reduce the impact of the disaster and create a resilient coastal area to reduce the risk of natural-induced disasters.
Coastal Flooding Impacts Induced Sea Level Rise on Banda Aceh Coastal Morphology
Authors: Al’ala Musa , Syamsidik  
Published: July 2019

Abstract
The research focus is in assessing the impact of sea level rise induced by climate change towards coastal morphology. The process went through numerical modelling combining the flow and swan model generated by Delft3D to mimic morphology process within 100 years in Banda Aceh Coastal Defence. Banda Aceh coastal morphology keeps in recovery process as the coastal line keeps growing after the 2004 devastating morphology destruction until the late 2017. A sea level rise scenario was adopted from IPCC and TOPEX Poseidon with a 7 mm/year increase rate which was recorded between 1992 and 2015. Results recorded Banda Aceh had both sedimented and eroded area. Coastal protection gave the proper protection to Banda Aceh coastal defense while the three of Banda Aceh rivers (Krueng Neng river, Krueng Aceh river, and Floodway) gave sediment supply from the channel. Coastal line retreat between 15 to 100 m was also recorded on the side of Syiah Kuala - Alue Naga beach site, while others had enough sediment supply produced growing shoreline. The predicted regrow coastal area could be utilized as buffer zone as the government had difficulties in relocating the people from the coastal area.
Reconstruction of the 2004 Tsunami Inundation Map in Banda Aceh Through Numerical Model and Its Validation with Post-Tsunami Survey Data
Authors: Tursina  , Syamsidik  
Published: July 2019

Abstract
The National Oceanic and Atmospheric Administration (NOAA) recorded the 2004 tsunami heights in the Indian Ocean using the DART buoy tool and survey field data in the land side of Banda Aceh. Furthermore, 85 tsunami poles around Banda Aceh and Aceh Besar were used to mark the tsunami flow depth. The flow depth of the tsunami data recorded plays an important role in fostering our understanding of the physical tsunami wave generation and inundation using tsunami modeling. This study is aimed at comparing the results of the tsunami flow depth modeling in Banda Aceh with some measurement data from NOAA and Tsunami Poles. The tsunami modeling process was applied using the Cornell Multi-Grid Coupled Tsunami Model (COMCOT) computational program.We used 6 nested grids and the innermost layer covering the Banda Aceh region. The Layer 6 used for the variable Manning roughness coefficient represents the surface land use before the tsunami. We put 139 and 67 observation points on land to observe tsunami flow depth data according to NOAA and Tsunami pole coordinates, respectively. The result shows that NOAA data gave poor agreement with numerical simulations. A better result was obtained when using tsunami poles. We recommend increasing the use of the tsunami poles data as they were produced with a rigorous validation process for the 2004 tsunami.
Revisiting The 2018 Kalibening Earthquake Sequence In Central Java: Call for the Revision of Earthquake Hazard
Authors: Sipayung Renhard , Sianipar Dimas , Prayoedhie Setyoajie , Daryono  , Arifin Januar , Simanjuntak Andrean V H , Muksin Umar , Prabu Sesar , Daniarsyad Gatut , Haryanta  , Putranto Nugroho , Azimi Ali 
Published: July 2019

AbstractAs moderate devastating earthquake that impacted the economic loss was about $ 1.68 million US, the 2018 Kalibening earthquake quite shocked where the faulting mechanism still unconfirmed. There was no reference indicating the existence of the faulting zone exactly on the earthquake sequence. We take a benefit from seismic temporary network with the density ±2 km, which deployed while a macroseismic survey in purposing to evaluate the 2018 Kalibening earthquake sequence. Earthquake relocation using double difference combined with cross-correlation and determining earthquake moment tensor inversion solution using near source seismograms were applied. We suggested the deformation scheme of this earthquake with a thrust faulting with 307.5 / 28.8 / 118.5 (Strike / Dip / Rake) as a result from mainshock and supported by aftershock moment tensor solutions. This parameter consistent to aftershocks relocation results which formed a lineation trending NW-SE appropriate with Strike = 307.5. The cross-section exhibits aftershocks pattern which elongated deeper and formed a slope from SW to NE approximately fit to Dip = 28.8. The results from investigating the background seismicity in Banjarnegara Region using combined catalog (ISC-USGS-BMKG) compared to BJI (single station) showed the sparse and the lacking of InaTEWS seismic network configurations. Finally impacted to losses in earthquake cataloging, leads the low area coverages around Banjarnegara region. Together with our results, we called for the revision of earthquake hazard assessment for Central Java province, especially in Banjarnegara region.