Numerical simulation of pile driving: the BRUTUS computer code (In French)

1991 ◽  
Vol 28 (4) ◽  
pp. A251
Keyword(s):  
Numerical Simulation ◽  
Computer Code ◽  
Pile Driving

Impact Simulation of a Crashworthy Composite Fuselage Section with Energy-Absorbing Floor

2014 ◽  
Vol 529 ◽  
pp. 102-107
Author(s):  
Hai Bo Luo ◽  
Ying Yan ◽  
Xiang Ji Meng ◽  
Tao Tao Zhang ◽  
Zu Dian Liang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Dynamic Response ◽  
Relative Error ◽  
High Strength ◽  
Computer Code ◽  
Impact Simulation ◽  
Average Acceleration ◽  
Simulation Results ◽  
Energy Absorbing

A 7.8m/s vertical drop simulate of a full composite fuselage section was conducted with energy-absorbing floor to evaluate the crashworthiness features of the fuselage section and to predict its dynamic response to dummies in future. The 1.52m diameter fuselage section consists of a high strength upper fuselage frame, one stiff structural floor and an energy-absorbing subfloor constructed of Rohacell foam blocks. The experimental data from literature [6] were analyzed and correlated with predictions from an impact simulation developed using the nonlinear explicit transient dynamic computer code MSC.Dytran. The simulated average acceleration did not exceed 13g, by contrast with experimental results, whose relative error is less than 11%. The numerical simulation results agree with experiments well.

scholarly journals Parallel Numerical Simulation of the Magnetic Moment Reversal within the φ0-Josephson Junction Spintronic Model

2020 ◽  
Vol 226 ◽  
pp. 02018
Author(s):  
Stefani Panayotova ◽  
Maxim Bashashin ◽  
Elena Zemlyanaya ◽  
Pavlina Atanasova ◽  
Yury Shukrinov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnetic Moment ◽  
Information Technologies ◽  
Parallel Implementation ◽  
Numerical Study ◽  
Nonlinear Differential Equations ◽  
Computer Code ◽  
Computer Time ◽  
Physical Parameters ◽  
Wide Range

The φ0-Josephson Dushanbe, Tajikistanjunction model with a coupling between the magnetic moment and the Josephson current in the “superconductor–ferromagnet–superconductor” system has been investigated. Numerical solution of the respective system of nonlinear differential equations is based on the two-stage Gauss–Legendre algorithm. For numerical simulation in a wide range of parameters which requires a significant computer time, a parallel MPI=C++ computer code has been developed. Results of numerical study of the magnetization effect depending on physical parameters, as well as results of methodological calculations demonstrating the efficiency of the parallel implementation, are presented. Calculations have been carried out at the Heterogeneous Platform “HybriLIT” and on the supercomputer “Govorun” of the Multifunctional Information and Computing Complex of the Laboratory of Information Technologies, JINR (Dubna).

Optimal Design and Aerodynamic Study of Leaned Transonic Axial Flow Fan Rotors

2014 ◽  
Author(s):  
Seyed Reza Razavi ◽  
Masoud Boroomand
Keyword(s):  
Numerical Simulation ◽  
Optimization Problems ◽  
Pressure Ratio ◽  
Axial Flow ◽  
Target Function ◽  
Computer Code ◽  
Optimization Method ◽  
Tangential Direction ◽  
Operating Range ◽  
Safe Operating

Multi-Objective Optimization Problems (MOP) are very usual and complicated subjects in Turbomachinery and there are several methodologies for optimizing these problems. Genetic Algorithm (GA) and Artificial Neural Network (ANN) are the most popular ones to solve MOP. In this study, optimization was done for leaned rotor blades to achieve maximum performance parameters including specifically stage pressure ratio, efficiency and operating range. By bending an existing transonic rotor which is well-known as NASA rotor-67 in tangential direction, effect of leaning on performance and aerodynamic parameters of transonic axial-flow compressor rotors was studied. To understand all effects of lean angle, an organized investigation including numerical simulation of basic rotor, implementation of curvatures on basic rotor, numerical simulation of leaned blades and optimization were applied. Various levels of lean angles were implemented to basic rotor and by employing a three dimensional compressible turbulent model, the operating parameters were achieved. Afterwards, the results were used as input data of optimization computer code. Finally, the ANN optimization method was used to achieve maximum stage pressure ratio, efficiency and safe operating range. it was found that the Optimized leaned blades according to their target function had positive or negative optimized angles and the optimized lean angles effectively increased the safe operating range about 12% and simultaneously increase the pressure ratio and efficiency by 4% and 5%, respectively.

Numerical Simulation and Experimentation of Warm Metal Powder Compaction Process

2011 ◽  
Vol 462-463 ◽  
pp. 704-709 ◽  
Author(s):  
Mujibur M. Rahman ◽  
F. Tarlochan ◽  
Ramesh Singh ◽  
Ahmad Kamal Ariffin ◽  
S.S.M. Nor
Keyword(s):  
Numerical Simulation ◽  
Metal Powder ◽  
Deformation Behaviour ◽  
Computer Code ◽  
Powder Compaction ◽  
Forming Process ◽  
Yield Model ◽  
Warm Compaction ◽  
Powder Mass ◽  
Forming Temperature

Powder compaction at elevated temperature or known as warm compaction is a process of producing green compacts from metal powder, which is generally conducted between the ambient and the recrystalization temperature of the main powder constituent. Even though, warm compaction was initiated at around 1998, not a lot of information can be found in the literature especially on the numerical simulation of the process. Therefore, this paper presents the simulation of warm metal powder forming process by using the developed computer code. The Elliptical Cap yield model has been used to represent the deformation behaviour of the powder mass during the forming process at above ambient temperature. The material properties of powder mass, i. e., friction coefficient, elastic index, and plastic index, at different forming temperature, are established through warm compaction experiment. The simulation was conducted to generate a green compact of a plain bush component. Some numerical simulation results were validated through experimentation, where a good agreement was found between the numerical simulation and the experimental results.

Numerical Simulation and Experimental Analysis of an Active Hydraulic Excitation System Based on Pulsating Flow

2011 ◽  
Vol 295-297 ◽  
pp. 2216-2222 ◽  
Author(s):  
Zi Ming Kou ◽  
Hui Xian Zhang ◽  
Juan Wu ◽  
Chun Yue Lu
Keyword(s):  
Numerical Simulation ◽  
Frequency Converter ◽  
Experimental System ◽  
Computer Code ◽  
Hydraulic Cylinder ◽  
Pulsating Flow ◽  
Vibration Exciter ◽  
Rotary Speed ◽  
Vibration Wave ◽  
Vibration Parameters

A vibration wave generated actively by hydraulic vibration exciter was studied, and an experimental system based on the theory of water hammer was designed. The new developed vibration exciter is driven by the motor whose rotary speed can be adjusted by frequency converter, by means of which transient pulsating flow is generated regularly. Consequently the piston of hydraulic cylinder is driven periodically with the rotation of vibration exciter. Furthermore, mathematical model was established by the method of characteristics and computer code was developed to calculate numerical solution. The simulation results show that there are different flow velocities distributed at every cross section along the pipe. Measured data is basically consistent with the numerical simulation, which indicates that the vibration parameters of hydraulic cylinder can be controlled effectively.

scholarly journals NUMERICAL SIMULATION OF A DROP WEIGHT TEST OF DUCTILE PIPE STEEL

2020 ◽  
Vol 82 (4) ◽  
pp. 493-506
Author(s):  
A.I. Abakumov ◽  
I.I. Safronov ◽  
A.S. Smirnov ◽  
A.B. Arabey ◽  
A.G. Glebov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Ductile Failure ◽  
Crack Tip ◽  
Computer Code ◽  
Tensile Tests ◽  
Steel Sample ◽  
Strength Parameter ◽  
Resistance Force ◽  
Flow Energy ◽  
Drop Weight

The processes in the metal sample of a supply pipeline realized under drop-weight tests (DWT, or DWTT according to ASTM) are studied. DWT is a proof test of the pipeline metal that should ensure high resistance of the pipeline against extensive destruction. Numerical simulation of DWT with the steel sample of full thickness was performed; the steel had К65 strength grade. Parallel finite-element computer code DANCO developed in RFNC-VNIIEF was used for simulations. A detailed description of the rupture formation process required a fine-enough mesh and a supercomputer. To carry out the numerical simulation of the process, the constants of the deformation diagram were used, obtained on the basis of static and dynamic tensile tests of samples at room temperature. A modified Gurson–Tvergaard–Niedelman (GTNm) model for macro-viscous steel destruction (ductile failure) was used to describe the strain and the destruction of the metal. The modification makes it possible to describe direct and oblique cuts and their combinations in case of ductile failure of small-size objects (rods, plates, shells). The calculated dependences of the movement of the crack tip on the movement of the load and the resistance force of the sample on the movement of the crack tip are presented. We have got a good agreement between the computations and experimental data with regard to the “force–displacement” strength parameter, the deformed profiles and macro-geometry of the ruptured sample after the tests. The computation results reveal the mechanics of the crack origination, start and propagation in the sample, describe the plastic-flow energy distribution in the process of dynamic destruction. The results of the work can be used in the development of the requirements and of the implementation conditions of the “tooled” DWT, and for numerical simulation of the extensive destruction at the main pipeline.

Response of Armour Plate Subjected to Blast Loading Based on Analytical Model of Second Order Single Degree of Freedom

2015 ◽  
Vol 819 ◽  
pp. 387-392
Author(s):  
Ahmad Zaidi Ahmad Mujahid ◽  
Shah Koslan Md Fuad ◽  
Othman Mohd Zaid
Keyword(s):  
Numerical Simulation ◽  
Blast Loading ◽  
Computer Code ◽  
Small Error ◽  
Second Order ◽  
Degree Of Freedom ◽  
Analytical Prediction ◽  
Reliable Technique ◽  
Single Degree Of Freedom ◽  
Single Degree

The rolled homogeneous armour (RHA) plate is commonly used for armoured vehicle skin. Preliminary predictions of the deflections from RHA plate subjected to blast loading is important for establishing guidelines before it is used in vehicle skin. The goal of this work is a reliable technique for predicting the RHA plate response subjected to blast loading, and the empirical result performed by other researchers will be taken as a reference. Based on selected references, a small number of assumptions lead to the developed Single Degree of Freedom (SDOF) idealised models. This paper provides an analytical prediction for the RHA plate response using SDOF in one dimension (1D) approach. The analytical capability was subsequently verified using the non-linear fluid structure interaction (FSI) numerical simulation and the AUTODYN computer code. The midpoint deflections of the RHA plate were taken as the figure of merit. Based on the small error percentage and the support of strong analytical arguments, the second order SDOF analytical approach and numerical simulation using the AUTODYN computer code can be employed as a method of analysis.

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