scholarly journals Numerical simulation of aerodynamic properties of separable elements of space-rocket systems in the LOGOS software package

2021 ◽  
Vol 2099 (1) ◽  
pp. 012072
Author(s):  
S V Aksenov ◽  
D A Korchazhkin ◽  
A Yu Puzan ◽  
O A Puzan
Keyword(s):  
Numerical Simulation ◽  
Computer Simulation ◽  
Software Package ◽  
Reference Data ◽  
Verification And Validation ◽  
Aerodynamic Properties ◽  
Space Rocket ◽  
Simulation Results

Abstract The work describes simulation results of the aerodynamic properties of split elements of the space-rocket systems in the LOGOS software package: the review of the advanced methods for aerodynamic properties has been carried out, the advantages of the computer simulation when solving such problems were demonstrated, verification and validation computations of the simulation problems for the split elements were performed, the produced results were compared with the reference data from available publications. The analysis of the results confirmed the applicability of the LOGOS software package for computing aerodynamic properties of the split elements.

scholarly journals ESTIMATION OF THE WAVE FORMATION FOR EXTRA-CAPACITY CATAMARAN WITH VARIOUS FORMS OF INNER SIDES

2020 ◽  
pp. 109-120
Author(s):  
Egor Yu. Cheban ◽  
Olga V. Martemianova ◽  
Sergey G. Mitroshin ◽  
Natalia E. Zotova ◽  
Alexei V. Logvinov
Keyword(s):  
Numerical Simulation ◽  
Numerical Methods ◽  
Software Package ◽  
Wave Formation ◽  
Total Width ◽  
Ship Wave ◽  
Flat Side ◽  
Wave Heights ◽  
Simulation Results

The research was carried out by numerical methods of wave formation and resistance for an extra-capacity displacement catamaran in the range of Froude numbers from 0.181 to 0.3 and the range of relative clearance from 0.3 to 0.55. Symmetrical hulls and hulls with an inner flat side, developed on the basic lines of M. Ya. Alferiev were used. The ship wave heights generated by the hulls of the catamarans and their resistance were compared with the corresponding simulation results for a large mono-hull vessel with a hull width equal to the total width of the catamaran. Numerical simulation was performed in the FineMarineTM software package. It was found that the resistance and wave heights from a mono-hull vessel and a catamaran with a flat inner side exceed the resistance and wave heights of a catamaran with symmetrical hulls.

Computer Simulation of a Transportation Package Impacting Concrete and Soil Targets

2004 ◽  
Author(s):  
S. N. Huang ◽  
S. S. Shiraga ◽  
L. M. Hay
Keyword(s):  
Numerical Simulation ◽  
Computer Simulation ◽  
Impact Test ◽  
Impact Behavior ◽  
Test Results ◽  
Hypothetical Accident ◽  
Simulation Results ◽  
Accident Conditions ◽  
The Impact

This paper compares transportation mockup cask impact test results onto real surfaces with FEA numerical simulation results. The impact test results are from a series of cask impact tests that were conducted by Sandia National Laboratories (Gonzales 1987). The Sandia tests were conducted with a half-scale instrumented cask mockup impacting an essentially unyielding surface, in-situ soil, concrete runways, and concrete highways. The cask numerical simulations with these same surfaces are conducted with ABAQUS/Explicit, Version 5.8, The results are then compared and evaluated to access the viability of using numerical simulation to predict the impact behavior of transportation casks under hypothetical accident conditions.

Foam Concrete and Composite Fittings Cohesion Parameters: Experimental Result and Numerical Simulation

2020 ◽  
Vol 992 ◽  
pp. 836-842
Author(s):  
K.S. Kotova ◽  
G.S. Slavcheva
Keyword(s):  
Numerical Simulation ◽  
Computer Simulation ◽  
Cohesive Strength ◽  
Test Method ◽  
Experimental Result ◽  
Glass Composite ◽  
Foam Concrete ◽  
Experiment Data ◽  
Real Experiment ◽  
Simulation Results

The article presents the computer simulation results and real experiment of foam concrete cohesion with glass-composite, basalt-composite and metal fittings in bending elements. Numerical simulation of beams implemented with software package “Lira-SAPR 2013” using finite element method for modeling. For real experiment used bending beam test method according to ISO 10406-1:2015. As a result, the influence of the loading level and foam concrete density on the reinforcement slipping value and foam concrete cohesive strength with reinforcement in the bending elements. The foam concrete cohesive strength with glass-composite fittings meets the standard requirements, so it can be recommended for the foam concrete bending elements reinforcement. Verification of the computer simulation results with the real experiment data allowed to establish the efficiency of the used numerical model and revealed the need to use the cohesion parameters in the "foam concrete – reinforcement" system for foam concrete structures calculations in specialized programs.

Optimization by Numerical Simulation of the Focusing Properties of Self-Magnetically Insulated Ion Diodes

1991 ◽  
Vol 02 (01) ◽  
pp. 536-540
Author(s):  
THOMAS WESTERMANN
Keyword(s):  
Numerical Simulation ◽  
Computer Simulation ◽  
Power Density ◽  
The Self ◽  
Anode Surface ◽  
Two Dimensional ◽  
Simulation Results ◽  
Focusing Properties

We present two-dimensional electromagnetic computer simulation results performed in order to investigate the focusing properties of self-magnetically insulated ion diodes. It has been shown computationally that in the case of the self-magnetically insulated bθ-diode the power density can be improved by a factor 10 by changing the anode surface.

scholarly journals TO THE PROBLEM OF DETERMINING THE COEFFICIENT OF THERMAL EXPANSION OF MATERIALS

2020 ◽  
pp. 284-292
Author(s):  
Денис Васильевич Пьянзин ◽  
Николай Александрович Панькин ◽  
Александр Николаевич Чалдышкин ◽  
Николай Иванович Чистяков
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Computer Simulation ◽  
Thermal Expansion ◽  
Software Package ◽  
Coefficient Of Thermal Expansion ◽  
Metallic Materials ◽  
Ansys Software ◽  
Simulation Results ◽  
Good Agreement

Проведено экспериментальное исследование и компьютерное моделирование в программном комплексе ANSYS термического воздействия на металлический материал. Отмечается уменьшение значений коэффициента теплового расширения при увеличении скорости нагрева образца. Показано, что данное поведение обусловлено наличием градиента температур между его центральной и поверхностью частями. Отмечается хорошее согласие результатов компьютерного моделирования с соответствующими экспериментальными данными. Значения коэффициента теплового расширения близки к истинным, которые были определены при малых скоростях нагрева/охлаждения или при длительной выдержке образца при конечной и начальной температурах. Результаты моделирования в ANSYS могут быть использованы при интерпретации и прогнозировании тепловых свойств металлических материалов. An experimental study and computer modeling in the ANSYS software package of the thermal effect on a metal material was carried out. A decrease in the values of the coefficient of the thermal expansion is noted with an increase in the heating rate of the sample. It is shown that this behavior is due to the presence of the temperature gradient between its central and surface parts. Good agreement of the results of computer simulation with the corresponding experimental data is found. The values of the coefficient of thermal expansion are close to true ones determined at low heating / cooling rates or with long exposure of the sample at the final and initial temperatures. The simulation results in ANSYS can be used to interpret and predict thermal properties of metallic materials.

Verification and Validation of CFD Uncertainty Analysis Based on SST K-ω Model

2020 ◽  
Author(s):  
Li Zhang ◽  
Weimin Chen ◽  
Jianting Chen ◽  
Chuanming Zhou
Keyword(s):  
Numerical Simulation ◽  
Uncertainty Analysis ◽  
Cfd Simulation ◽  
Numerical Results ◽  
Verification And Validation ◽  
Ship Model ◽  
The Past ◽  
Mesh Density ◽  
Simulation Results ◽  
Selection Of

Abstract CFD uncertainty analysis is a process to quantify the accuracy of numerical simulation results, and it is also a research hotspot in the past decades. ITTC(2017) requires uncertainty analysis of ship CFD simulation results, that is, verification and validation. In this paper, with reference to the recommended procedures by ITTC, the uncertainty of the CFD numerical simulation results of ship model resistance was analyzed. Based on the SST k-ω turbulence model, the Y+ values near the wall were set to 60,120,240, respectively. And for each and Y+ value, three different sets of grid densities were set respectively, and the uncertainty was analyzed. The results show that: 1) the results of Y+ at 60 and 120 were not validated, and the results at 240 was validated, 2) the selection of Y+ value has a significant effect on the numerical results, 3) increasing the mesh density can make the result converge, but it is not sure to get the result with the least error. Through the uncertainty analysis of CFD results, it is helpful to find a method to improve the accuracy of the numerical results.

scholarly journals TRANSILLUMINATION OF THE DENSE PLASMA BARRIER BY THE STRONG BEAM OF ELECTROMAGNETIC WAVES: COMPUTER SIMULATION

2020 ◽  
pp. 64-68
Author(s):  
B.R. Mykhailenko ◽  
I.O. Anisimov
Keyword(s):  
Computer Simulation ◽  
Electromagnetic Wave ◽  
Software Package ◽  
Electromagnetic Waves ◽  
Dense Plasma ◽  
Wave Beam ◽  
Incident Beam ◽  
Strong Electromagnetic Wave ◽  
Higher Power ◽  
Simulation Results

Transillumination of a dense plasma barrier by a strong electromagnetic wave beam has been studied via simulation using the PIConGPU software package. Formation of the channel with reduced plasma density, predicted theoretically and detected experimentally, was observed. For a higher power incident beam, plasma turbulent dynamics has been observed, which leads to its "fast" transillumination. The simulation results didn’t confirm the theoretically proposed mechanisms of "fast" transillumination.

Multi Algorithm in CFD Software and its Application to Numerical Simulation of 2D Regular Wave

2013 ◽  
Vol 710 ◽  
pp. 708-711
Author(s):  
Han Wu Li ◽  
Tao Yang
Keyword(s):  
Numerical Simulation ◽  
Software Package ◽  
Actual Situation ◽  
Regular Wave ◽  
Regular Waves ◽  
Commercial Software ◽  
Advantages And Disadvantages ◽  
Simulation Results

Fluent is a popular CFD software package now, it can model complicated fluxion question from incondensability to the highly condensability. This article compares and analyzes the advantages and disadvantages of several algorithms which used by the commercial software Fluent. It is must be determined the model accordance to the actual situation in a number of algorithm. Accordance to compared, the standard k-e model is used to simulate the regular wave in flume. The simulation results well reflect the characteristics of the regular waves, agreed well with theoretical value.

Avalanche Features in Silicon Schottky-FETs in Accordance with Numerical Simulation Results

2006 ◽  
Vol 65 (16) ◽  
pp. 1533-1546
Author(s):  
Yu. Ye. Gordienko ◽  
S. A. Zuev ◽  
V. V. Starostenko ◽  
V. Yu. Tereshchenko ◽  
A. A. Shadrin
Keyword(s):  
Numerical Simulation ◽  
Simulation Results

SIMULATION OF SOFT START OF SYNCHRONOUS ELECTRIC DRIVES

2019 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Water Supply Systems ◽  
Factors Affecting ◽  
Electric Drives ◽  
Soft Start ◽  
Simulation Results ◽  
Pumping Units ◽  
Negative Factors ◽  
Supply Systems

The main negative factors affecting the starting modes of synchronous electric drives of pumping units of irrigation water supply systems were identified, computer simulation of direct and soft start of synchronous electric drive was made, the simulation results are shown in graphs and a brief conclusion was made on the study.

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