bluuebunny/crossref_metadata_2025_split huggingface dataset:
Non-isothermal motion of viscous fluid layer on outer surface of horizontal rotating cylinder
Authors: Konon P N , Shkadov V Y , Zhuk A V 
Published: July 2019

Abstract
We study the non-isothermal plane motion of viscous fluid on the outer surface of rotating with constant angular velocity horizontally placed cylinder in the fields of surface tension, gravity and inertia. The problem was solved by direct method and evolution of the free surface was investigated taking into account varying temperature of fluid.
The hydrodynamical modeling of the Supernovae Ia explosion by means adaptive nested meshes on supercomputers
Authors: Kulikov Igor , Chernykh Igor , Protasov Viktor 
Published: July 2019

Abstract
The results of the study of an explosion point of supernova type Ia (SNIa) with using of mathematical modeling on supercomputers is given in the paper. Hydrodynamical model closed by the stellar equation of state and supplemented by Poisson equation for gravitational potential is used for modeling of a white dwarf. The nuclear combustion of carbon, for which the analytical solution is constructed, is accounted in the model. A multilevel organization of computations on nested grids is used in the solution. The new highorder accuracy numerical method based on the Godunov method, the Rusanov scheme and the piecewise parabolic method on local stencil, adapted for computations on nested grids, is built. The parallel implementation is based on the idea of distributed computations, where the architecture with shared memory is used for modeling of the hydrodynamic evolution of white dwarfs, when the critical values of temperature and density are reached, a new task is launched on the architecture with distributed memory, in which the evolution of hydrodynamic turbulence leading to supersonic nuclear combustion of carbon is simulated.
Simulation of composite shells based on the generating finite elements
Authors: Matveev A D 
Published: July 2019

Abstract
In the present paper, a method of generating finite elements (FE) to construct complex-shaped three-dimensional composite multi-grid finite elements (MgFE) of two types is proposed. When constructed m-grid finite element (mgFE), m nested grids are used. The fine grid is generated by the base partitioning of mgFE, taking into account its heterogeneous structure and shape. The displacement functions and stress state in the MgFE described by the equations of the three-dimensional elasticity problems (without introducing any additional simplifying hypotheses), are represented in local rectangular coordinates. When constructed MgFE (without increasing their dimension), arbitrarily small basic partitions can be used arbitrarily closely taking into account the complex inhomogeneous structure and shape of the MgFE, and arbitrarily closely describing the three-dimensional stress state in the MgFE. The 1st type MgFE region is obtained by turning a given flat generating single-grid FE (complex shape) about a given axis by a given angle, the 2nd type MgFE region is obtained by parallel moving the generating FE in a given direction by a specified distance. The 1st type MgFE is applied to calculate some composite rotational shells; the 2nd type is for composite cylindrical shells. The advantages of the proposed MgFE make it possible to account for the inhomogeneous structure of the shells, thus giving rise to small-dimensional discrete models and accurate solutions
Linear stability of Landau jet: non-parallel effects
Authors: Mullyadzhanov R , Yavorsky N , Oberleithner K 
Published: July 2019

Abstract
We perform linear stability analysis of Landau jet using quasi-parallel approximation and self-similar approach. While the former detects only sinusoidal unstable modes, the latter also captures axisymmetric disturbances in agreement with previous results. The direct comparison of dispersion curves and eigenmode shapes for m = 1 and ReD
≈ 56 indicates that low frequencies are poorly described within quasi-parallel approximation making this approach questionable for a laminar-turbulent transition model.
Analytical solution of the problem of hydrate formation in a porous medium with a temperature jump at the phase transition front
Authors: Musakaev N G , Khasanov M K 
Published: July 2019

Abstract
The results of theoretical study of the methane hydrate formation during the hydrocarbon gas injection into a porous reservoir initially saturated with methane and water are presented. In the axisymmetric approximation, mathematical model with a stepwise temperature distribution in the reservoir is considered. For this case, an approximate analytical solution is constructed with a temperature jump at the gas hydrate formation front in the form of an explicit functional dependence of the self-similar coordinate of this boundary on the parameters of a porous medium and an injected gas.
Modeling of bubble dynamics and heat transfer in polydispersed two-phase turbulent flow in a vertical pipe
Authors: Pakhomov M A 
Published: July 2019

Abstract
The numerical results on the flow, bubble distributions and heat transfer in a bubbly polydispersed upward flow in a pipe are presented. The mathematical model is based on the Eulerian approach with considering the back effects of bubbles on the mean and turbulent characteristics of the carrier fluid phase. The model is coupled with the method of δ-function approximation. The model takes into account the interphase momentum transfer, bubble breakup and coalescence processes. The set of axisymmetrical RANS equations is used for modeling two-phase bubbly flows. Turbulence of the carrier fluid phase is predicted using the Reynolds stress transport model. The effect of variation in the gas volumetric flow rate ratio, inlet mean fluid temperature, and its velocity on the flow structure and heat transfer in the two-phase flow is analyzed. The addition of air bubbles results in a significant increase in the heat transfer rate (up to three times) and the effect augments by increasing the gas volumetric flow rate ratio. The numerical simulations show a good agreement with the experimental and numerical results of other authors.
The investigation of drying and freezing of spherical samples of porous materials with second order nonlinear differential equations
Authors: Salnikov M V , Fedoseev A V , Sukhinin G I 
Published: July 2019

Abstract
The purpose of the current investigation is to present the results of the model, which allows obtaining the temperature distribution in a spherical sample of porous clay for the processes of rapid drying (heating) and freezing (cooling). Solutions are one-dimensional non-linear temperature distributions for each point in time. The temperature of the external surface of the sample was set equal to the ambient temperature.
On two-dimensional gas flows through granular phase change material
Authors: Fetsov Sergey S 
Published: July 2019

Abstract
A novel numerical model is proposed for modelling two-dimensional planar gas flows in granular phase change material (PCM). The mentioned model consists of system of equations based on the classical methods of mechanics of heterogeneous media which is solved by original finite-difference algorithm. Effect of heat transfer with ambient medium on mushy zone propagation in the bed of granular PCM is investigated by means of numerical experiment. It is shown that phase transition speed can decrease significantly near the side walls of the bed in relation to the central region which provides curvature of the mushy zone boundaries and nonuniform melting of the PCM in the bed. Kind of curvature of these boundaries can change in dependence of heat conductivity coefficient of the PCM.
Investigation of the generalization of Leith’s model of the phenomenological theory of wave turbulence
Authors: Chirkunov Yu A 
Published: July 2019

Abstract
A generalization of the Leith model of the phenomenological theory of the wave turbulence is studied. With the methods of group analysis, the basic models possessing nontrivial symmetries are obtained. The invariant solutions describing the invariant submodels of rank 0, are found in an explicit form. The physical meaning of these solutions is obtained. In particular, with the help of these solutions the turbulent processes for which there are “destructive waves” both with fixed wave numbers and with varying wave numbers are described. On the example of an invariant solution of rank 1 it was shown that the search of the invariant solutions of rank 1 that can not not be found explicitly, can be reduced to solving of the integral equations. For this solution turbulent processes are researched for which at the initial instant of a time and for a fixed value of the wave number either the turbulence energy and rate of its change or the turbulence energy and its gradient are given. Under certain conditions, the existence and uniqueness of the solutions of the boundary value problems describing these processes are established.
Investigation of different numerical schemes for simulating melt motion on the surface of fuel pin
Authors: Chuhno V I , Butov A A , Usov E V 
Published: July 2019

Abstract
Simulation of severe accident in nuclear reactor is a key element in a safety analysis of nuclear power plants. The goal of presented paper is development of models for fuel pins melting. A detailed description of the system of equations, to simulate melt motion along fuel pin, is presented in the current paper. The system consists of mass, energy and momentum conservation equations. An analysis of hyperbolicity and stability of this system of equations is carried out. Relocation of the melt depends on the balance of the gravitational forces, friction forces between melt and surface of the fuel pins and friction between melt and coolant. The analysis of stability is made with help of Fourier transform. Up-wind scheme, MLU and MUSCL schemes are used to simulate melt motion.
Detecting the Phenomena of Sea Surface Temperature Anomaly by Vector Autoregressive
Authors: Miftahuddin  , Maulia Eva , Setiawan Ichsan , Gul Asma , Fadhli  , Hidayati  
Published: July 2019

Abstract
Climate change is one of the issues and a considerable threat to the environment in the future. These changes tend to fluctuate and vary significantly with time. Mostly, climate change issues are related to global temperature. The Earth’s climate system is effected by many parameters. Sea Surface Temperature Anomaly (SSTA) is one of those parameters. The phenomena of SSTA is a necessary indicator for understanding of climate change variability. Aceh province as to the west of Indonesia has location face directly to the Indian Ocean, especially in western region, southwest, and southern. Vector Autoregressive (VAR) approach has shown that SSTA dataset has stationer and non-cointegration properties in the period 2006-2017. Based on this research, it can be concluded that the best model for SSTA with climate parameters (air temperature, rainfall, relative humidity, wind speed and short-wave radiation) is VAR with the 4th optimal lag or VAR(4). The Impulse Response Function (IRF) analysis based on VAR(4) model, which is formed to look at the phenomena of SSTA to climate parameters, shows that wind speed, rainfall and short-wave radiation have a similar pattern of detection on the equilibrium line due to shock from SSTA. It takes around 5 days for the three variables to reach the equilibrium line. Whereas the air temperature and relative humidity variables have no significant effects of shocks that occur in the sea surface temperature anomaly.
Numerical Simulations of Tsunami Wave Properties on Coastal Slopes using One Piston-Wavemaker Method
Authors: Luthfi Mumtaz , Syamsidik  , Fauzi Amir , Fatimah Eldina 
Published: July 2019

Abstract
Most of the coastal area in the Ulee Lheue Bay of Aceh Besar was affected by a tsunami wave during the 2004 Indian Ocean Tsunami. Such area has an inclined bed floor which varies in slope. Variations of slope can affect tsunami wave properties such as tsunami arrival time, wave height and velocity. With those variations, the degree of the tsunami effects is highly unpredictable. Therefore, it is important to conduct a research to understand the effects of coastal slopes on tsunami waves propagations and wave deformation. Google SketchUp was used for designing the coastal slopes’ 3 Dimensional models. For the tsunami waves, solitary waves were generated by using smoothed particle hydrodynamics numerical models through the DualSPHysics software. The computation was based on the meshless method. From the simulations, the waves’ properties were obtained and were analyzed how coastal slopes affect the arrival time of tsunami waves, also for their height and velocity. Results show that the steepest coastal slope has the highest velocity, but shortest wave height and longest arrival time. Conversely, the flattest coastal slope has the lowest velocity, but highest wave height and shortest arrival time. Longer tsunami arrival times will benefit people in the evacuation process during the hazard.
Landslide Susceptibility Mapping (LSM) in Kelud Volcano Using Spatial Multi-Criteria Evaluation
Authors: Bachri Syamsul , Sumarmi  , Yudha Irawan Listyo , Utaya Sugeng , Dwitri Nurdiansyah Farizki , Erfika Nurjanah Alif , Wahyu Ning Tyas Lela , Amri Adillah Akhmad , Setia Purnama Denny 
Published: July 2019

Abstract
Mount Kelud eruption on February 2014 has a tremendous impact on the surrounding physical environment which ejected more than 200x106m3 of material. Thus, triggered secondary hazard such as landslides in the surrounding area. The purpose of this study is to map landslides susceptibility using Spatial Multi-Criteria Evaluation (SMCE) approach in Kelud mountainous area in particular within KRB 1 and 2. The identification of landslide occurrence was conducted based on remote sensing data and field observation along with four considerations criteria; topography, hydrology, soil, and environmental characteristics. Each factor then reduced into several sub-criteria such as slope, aspect, topographic position index, topographic wetness index, stream power index, rainfall, soil texture, soil structure, COLE index and land use. The SMCE method was also engaged with expert judgment provided by academic university’ view and the BPBD agencies. The result showed that the river channel and surrounding areas categorized as landslide high prone area. Furthermore, eruption material found as the sources of landslides occurrences.
SVIM: A Program for Seismic Vulnerability Index Determination and HVSR Data Processing
Authors: Khalqillah Aulia , Muksin Umar , Musfirah  , Ningsih W. A. , Irwandi  
Published: July 2019

Abstract
The seismic vulnerability of an area is important to be determined in order to reduce the risk of earthquake disaster. Ones need to calculate the values of dominant frequency and amplification from the Horizontal to Vertical Spectral Ratio (HVSR). Currently existing software for HVSR data processing, Geopsy, does not include seismic vulnerability index calculation. Using Geopsy, ones also need additional software for mapping purposes. From that problem, we introduce a Graphical User Interface (GUI) program for seismic vulnerability index determination and Horizontal to Vertical Spectral Ratio (HVSR) data processing and plotting the results into a map of the study area. The program is called SVIM (Seismic Vulnerability Index of Microtremor). The program has been built using Matlab and successfully tested to 21 microtremor data points acquired in Lamteuba, Aceh Besar, Aceh, Indonesia. We compared our results with those resulted from the calculation by using Geopsy and validated using coefficient correlation. The validation shown that the correlation coefficient of seismic vulnerability index was 96,40%, the correlation coefficient of frequency was 84,19%, and the correlation coefficient of amplification was 95,80%. We conclude the SVIM program can be used for seismic vulnerability index determination and HVSR data processing. The mapping part will be included in the SVIM software so that the users can easily obtain the necessary map.
Mineral Identification of Sedimentary Deposits of the 2004 Tsunami on the Aceh Besar Coast, Indonesia
Authors: Ismail  , Ismail Nazli 
Published: July 2019

AbstractUnderstanding tsunami deposit is quite important in order to understand the history of the tsunami and its process deeply. Nonetheless, most tsunami deposit studies only discussed the sediment grain characteristics, not the mineral contents in the deposits. Meanwhile, understanding the minerals in tsunami deposits is essential in order to understand the sediment composition deeply. Thus, we have utilized X-Ray Fluorescence and X-Ray Diffraction to study the sedimentary deposits of the 26 December 2004 Indian Ocean tsunami on the Aceh Besar coast, Indonesia. Our results showed that the sedimentary deposits of tsunami 2004 on the Aceh Besar coast contain 55% of SiO2, 19% of Fe2O3, 12% of Al2O3, 9% of CaO, 3% of K2O, and 2% of TiO2. The deposits are found to be crystalline with the average crystallite size of 678 Å. There is no heavy mineral found in the tsunami deposit from Aceh Besar coast. Our results revealed that the composition of mineral contained in the sedimentary deposits of tsunami 2004 on the Aceh Besar coast is the same as those from the volcanic ash.
Application of C-band Doppler Weather Radar (CDR) for Detecting Volcanic Ash Dispersion of Sinabung Eruption 19 February 2018
Authors: Irwandi I. , Ilhamsyah Yopi , Permana Donaldi S , Haloho Melanton P , Prasetyo Budi , Dana Isya N. 
Published: July 2019

Abstract
The weather radar is generally employed to forecast the potential of hydrometeorological hazard. In the present paper, we focus on the application of C-band Doppler Weather Radar (CDR) to identify February 19th, 2018 Sinabung volcanic eruption and its dispersion by using a direct product in the form of CMAX (Column Max) retrieved from reflectivity factor (dBz). The distribution of reflectivity factor varies from the center of the eruption to the farther location indicating the dispersion of material size erupted by the Sinabung. Lapili which is larger material size with 48dBz tends to locate in the nearby volcanic area. The medium size of the material like coarse volcanic ash with 33 dBz of reflectivity was floating in the air and carried away by the wind. Meanwhile fine volcanic ash with 10 dBz of reflectivity flies a great distance along with the wind.
Source Mechanism Analysis By Using Tensor Moment Inversion (Study Case : Pidie Jaya Earthquake in 2016 December 7th)
Authors: Simanjuntak Andrean V H , Muksin Umar , Qadariyah  , Setiawan Yosi , Irwandi  
Published: July 2019

Abstract
The earthquake event with M 6.7, on 7th December 2106 in Pidie Jaya, inflicted heavy casualties and material losses. In 1967, an earthquake event occurred near Pidie Jaya with M 6.1 which caused by Samalanga fault. However, the Pidie Jaya earthquake, although very close, but was not caused by the Samalanga fault activity. The latest, an unkown fault was considered as an active fault and the location of earthquake sources and and a part of the branching of Samalanga fault. It is very interesting to discuss, generally earthquake in Aceh, always happen on Sumatera fault’s path. Analysis of earthquake source mechanism is very important to do, to know the fault characteristic and direction. The analysis in this study involves inversion of tensor moments with isola program on each recording component, which will provide a synthetic wave as a comparison. The earthquake mechanism which obtained from the inversion is strike-slip with left-lateral and has the parameter strike 254°, dip 80°, and rake 48° on the first nodal plane as the true nodal. While, the second nodal has the plane parameter is strike 153°, dip 42°, and rake 165°. From these parameters, the first nodal plane that has a strike 153° is considered to be interpreting the new fault line as it is also followed by the direction of the spread of aftershocks. These result indicate that the Samalanga Fault is not the cause the Pidie Jaya earthquake, and shows the real direction of Pidie Jaya fault from South-West to North-East with lef-lateral orientation.
Mathematical Model for Mangrove Protections Toward Nearshore Process
Authors: Arif Salmawaty 
Published: July 2019

Abstract
This research developed a mathematical model to evaluate positive effects of mangroves to nearshore process. Particular purpose of the study was to conduct the analytical calculation for the steady condition of wave energy density and wave heights distributions due to the presence of mangroves. The method used was an expansion of the equations for nearshore quantities from the general condition to the one with the existence of mangroves. First, the wave energy density was calculated analytically by solving the wave energy conservation equation. The analytic solution for energy quantity is a function of position variable, involving longshore currents component and other physical constant parameters. The next step was to insert the dissipation of wave energy flux due to wave breaking into another energy balance equation involving mangroves effects. The mangroves contribution is represented by the dissipation due to the existence of the plants in the water. Other quantities included in the model are the wave group velocity and the dissipation due to bottom friction flux. Then the wave heights distribution concerning the mangroves effect was derived from the wave energy density function governed.
The Correlation Between P-Wave Velocity Value With Pathways Of Geothermal Manifestation In The Area Ie Jue, Aceh Besar As Hazardous Side Study
Authors: Asrillah  , Wahyuni D , Muksin Umar 
Published: July 2019

Abstract
Refraction seismic survey has been carried out in the manifestation area of Ie Jue, Seulawah Agam Volcano Region, Seulimuem, Aceh Besar Regency. This research aims to identify weak zones related to channel of geothermal outflow that would bring about a potential hazard for human activity and that goal is obtained by exstracting information from P-wave velocity. The data acquisition was conducted for two seismic lines located near to the geothermal manifestation area of Ie Jue. Both of the seismic lines were set up by linking the 24 geophones to the Seismograph PASI 16S and placing them in three meters spacing of each other. The offsets either left or right were laid out at 35 meters from first and last geophones, so the total spread length of each seismic line is 139 meters. The data recorded by the tool then were processed by using ZONDST2D and finally, the 2D velocity profile was obtained. The results show that the 2D velocity profiles illuminate us to potray and interpret the features figured out. The most valuable information provided by the profile is the existance of such the weak zones of the first and second seismic lines at relatively near-surface depth. These weak zones were suspected as the fractured or low-velocity zones, where their velocity ranges approximately at 0.2 - 1.2 km/sec. These low-velocity layers are strongly predicted as the pathways or channels of the geothermal fluids that appears to the surface. The shallow weak zones are potentially to become the hazard grounds because they are regularly traversed by timber trucks from which the dynamic load will be pushing them down. As consequence, the ground surfaces could gradually become a land subsidence endangering human activity within the vicinity of the area.