scholarly journals An Effective Computational Approach for the Numerical Simulation of Elasto-/Viscoplastic Solid Materials

2014 ◽  
Vol 7 (2) ◽  
pp. 340726 ◽  
Author(s):  
Fabio De Angelis
Keyword(s):  
Numerical Simulation ◽  
Computational Approach ◽  
Solid Materials ◽  
Viscoplastic Solid

A Numerical Simulation Capability for Analysis of Aircraft Inlet-Engine Compatibility

2004 ◽  
Vol 128 (3) ◽  
pp. 473-481 ◽  
Author(s):  
Alan Hale ◽  
Milt Davis ◽  
Jim Sirbaugh
Keyword(s):  
Numerical Simulation ◽  
Computational Approach ◽  
The Other ◽  
Computational Tool ◽  
Additional Insight ◽  
Turbine Engine ◽  
Inlet Distortion ◽  
Full Knowledge ◽  
Engine System ◽  
Isolated Systems

Two primary aircraft propulsion subsystems are the inlet and the engine. Traditionally these subsystems have been designed, analyzed, and tested as isolated systems. The interaction between the subsystems is modeled primarily through evaluating inlet distortion in an inlet test and then simulating this distortion in engine tests via screens or similar devices. Recently, it has been recognized that significant improvements in both performance and operability can be realized when both the inlet and the engine are designed with full knowledge of the other. In this paper, a computational tool called Turbine Engine Analysis Compressor Code is used to evaluate the effect of inlet distortion on a three-stage military fan. This three-stage military fan is further connected to an F-16 inlet and forebody operating at an angle of attack and sideslip to demonstrate the effect of inlet distortion generated by flight maneuvers. The computational approach of simulating an integrated inlet-engine system is expected to provide additional insight over evaluating the components separately.

A Numerical Simulation Capability for Analysis of Aircraft Inlet – Engine Compatibility

2004 ◽  
Author(s):  
Alan Hale ◽  
Milt Davis ◽  
Jim Sirbaugh
Keyword(s):  
Numerical Simulation ◽  
Computational Approach ◽  
The Other ◽  
Computational Tool ◽  
Additional Insight ◽  
Turbine Engine ◽  
Inlet Distortion ◽  
Full Knowledge ◽  
Engine System ◽  
Isolated Systems

Two primary aircraft propulsion subsystems are the inlet and the engine. Traditionally these subsystems have been designed, analyzed, and tested as isolated systems. The interaction between the subsystems is modeled primarily through evaluating inlet distortion in an inlet test and then simulating this distortion in engine tests via screens or similar devices. Recently, it has been recognized that significant improvements in both performance and operability can be realized when both the inlet and the engine are designed with full knowledge of the other. In this paper, a computational tool called Turbine Engine Analysis Compressor Code (TEACC) is used to evaluate the effect of inlet distortion on a three-stage military fan. This three-stage military fan is further connected to an F-16 inlet and forebody operating at an angle of attack and sideslip to demonstrate the effect of inlet distortion generated by flight maneuvers. The computational approach of simulating an integrated inlet-engine system is expected to provide additional insight over evaluating the components separately.

Microstructure and Stress Variation of Semi-Solid Magnesium Alloy during Isothermal Compression and Its Relationship to Thixotropy

2006 ◽  
Vol 116-117 ◽  
pp. 643-647
Author(s):  
Wei Wei Shan ◽  
Ju Fu Jiang ◽  
Shou Jing Luo
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloys ◽  
Peak Stress ◽  
Empty Space ◽  
Small Strain ◽  
Solid Particles ◽  
Isothermal Compression ◽  
Solid Materials ◽  
Stress Variation ◽  
Semi Solid

Thixotropy is the most important characteristic of semi-solid materials, and it is decided by the variation of microstructure during action of handling. In this paper, for the sake of the industrial thixoforming and numerical simulation, microstructure and stress variation of semisolid magnesium alloys during isothermal compression is researched. Here, samples are heated to the desired temperature in the empty space with various holding times and compressed horizontally. Stress–strain curves during compression can be given directly by the experimental computer, and each of curves show a peak stress in a small strain and then decrease rapidly, which originally because of the thixotropy of semisolid materials. Moreover, thixotropy of semisolid magnesium alloys is clearer with the evolution of microstructures including agglomeration and deagglomeration of solid particles and the moving way of liquid at different places and strain under different conditions. Microstructures during isothermal compression show that the deagglomeration of solid particles increase with increasing the strain rate, therefore, the thixotropy of semisolid magnesium alloys increases. However, when solid volume fractions are lower, the agglomeration of solid particles doesn’t change obviously with increase or decrease factors, meaning that the thixotropy is smaller. Relationships between thixotropy and microstructure at other different conditions are also given according to the experiments and analysis.

scholarly journals Modelling and numerical simulation of fire in a coffee storage hall

2021 ◽  
Vol 327 ◽  
pp. 01007
Author(s):  
Kalin Krumov ◽  
Nina Penkova ◽  
Boian Mladenov ◽  
Yordan Stoyanov
Keyword(s):  
Numerical Simulation ◽  
Gas Phase ◽  
Concentration Field ◽  
Flue Gases ◽  
Design Stage ◽  
Thermal Loads ◽  
Solid Materials ◽  
Building Envelopes ◽  
Ansys Cfx ◽  
Thermal Fluid Flow

An approach for modelling of fire in halls at solid materials burning, based on gas phase combustion models in ANSYS/CFX, is proposed. The models are suitable for quick prediction of the flue gases distribution and thermal loads on the building envelopes at a design stage. They was applied for numerical simulation of such processes in a coffee storage hall at different fire positions and forced anti-smoke ventilation. The thermal, fluid flow and concentration field were obtained at the modelled scenarios. Maximal thermal loads on the building envelopes are established at the case of fire near their non-streamlined parts.

Evaluating Volcanic Hazard Risk Through Numerical Simulations

2019 ◽  
Vol 14 (4) ◽  
pp. 604-615 ◽  
Author(s):  
Eisuke Fujita ◽  
Yu Iriyama ◽  
Toshiki Shimbori ◽  
Eiichi Sato ◽  
Kensuke Ishii ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Evaluation System ◽  
Volcanic Hazard ◽  
Input Parameter ◽  
Volcanic Hazards ◽  
Hazard Evaluation ◽  
Solid Materials ◽  
Analysis And Evaluation ◽  
Precise Evaluation ◽  
Multi Phase

As volcanic hazards induce damage with their flows of gases, liquids, and solid materials, a numerical simulation using multi-phase formulation is applicable to the analysis and evaluation of the risks from these volcanic hazards in both normal and emergent periods. A numerical simulation can also be useful for crisis management. Quick and precise evaluation is needed for upcoming and ongoing hazards, and we present here a concept for the development of a volcanic hazard evaluation system for these hazards, a system in which an input parameter database is compiled and countermeasure information is provided by considering the exposure and vulnerability database.

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