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.

Study on Numerical Simulation of Fire and Evacuation for a Supermarket

2015 ◽  
Vol 744-746 ◽  
pp. 1736-1740 ◽  
Author(s):  
Si Hui Dong ◽  
Min Li ◽  
Yu Han Lin
Keyword(s):  
Numerical Simulation ◽  
Physical Model ◽  
Development Process ◽  
Fire Danger ◽  
Actual Situation ◽  
Study Results ◽  
Simulation Results ◽  
Fire Scene ◽  
Safety Evacuation

3D physical model of a supermarket was constructed with Pyrosim software, and the fire scene was set according to the actual situation. The fire development process and personnel evacuation process were simulated with FDS. The fire danger time of the fire scene was analyzed according to the smoke temperature and visibility of different time. The personnel evacuation process to the supermarket was simulated with the evacuation software Evac, and the required safety egress time was calculated. By comparing the fire danger time and the required safety egress time, the conclusion was drawn that the supermarket can not meet the requirement for safety evacuation. After changing the conditions for safety evacuation, the required safety egress time was simulated again. And the simulation results showed that the changed evaluation conditions can meet the requirement for safety evacuation. The study results provide a basis to improve the safety evacuation conditions of the supermarket.

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.

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 Nonlinear calculation of reinforced concrete structures to the impact of the air shock wave

Vestnik MGSU ◽  
2019 ◽  
pp. 33-45 ◽  
Author(s):  
Anton Y. Savenkov ◽  
Oleg V. Mkrtychev
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Reinforced Concrete ◽  
Nonlinear Dynamic ◽  
Software Package ◽  
Crack Opening ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Advantages And Disadvantages ◽  
The Impact

Introduction. Researched methods of accounting for the nonlinear operation of reinforced concrete structures on the example of an industrial structure, when exposed to an air shock wave using modern software systems based on the finite element method. The calculation of reinforced concrete construction to the impact of an air shock wave, if no increased requirements for tightness are presented to it, in accordance with current regulatory documents, must be carried out taking into account the elastic-plastic work, crack opening in the stretched zone of concrete and plastic deformations of reinforcement are allowed. Reviewed by new coupling approach to determining the dynamic loads of a shock wave, implemented in the LS-DYNA software package, which allows to take into account the effects of a long-range explosion and wave-wrapping around a structure. Materials and methods. The study of the stress-strain state of the structures was carried out using numerical simulation. For the nonlinear equivalent-static method, a step-by-step calculation algorithm is used, with gradual accumulation and distribution of stresses, implemented in the LIRA-SAPR software package. For the nonlinear dynamic method, the Lagrangian-Eulerian formulation is used using the methods of gas dynamics in the LS-DYNA software package. Results. As a result of numerical simulation, the following was done analysis of existing methods of nonlinear calculations; analysis of the existing loads during the flow of shock waves around the structure; analysis of the forces and movements in the bearing elements, as well as pictures of the destruction of concrete and reinforcement. Conclusions. According to the results of the comparison of the two approaches, conclusions are drawn about the advantages and disadvantages of the methods. Advantages of nonlinear dynamic calculation methods are noted compared to the equivalent-static ones. Use of the combined approach to the description of the shock wave front gives a reduction in time and allows us to describe the interaction of the wave with the structure with sufficient accuracy. The findings indicate the relevance of the study and provide an opportunity to move to more reasonable computational models.

GSPN-Based Analysis of Storage Infrastructures for Rendering System

2011 ◽  
Vol 219-220 ◽  
pp. 1359-1362
Author(s):  
Zhi Guo Hong ◽  
Yong Bin Wang ◽  
Min Yong Shi
Keyword(s):  
Numerical Simulation ◽  
Petri Nets ◽  
Distributed Storage ◽  
Stochastic Petri Nets ◽  
Advantages And Disadvantages ◽  
Index Analysis ◽  
Generalized Stochastic Petri Nets ◽  
Simulation Results ◽  
Object Of Study ◽  
Distributed Rendering

By taking transmission delay into account, the optimization of distributed rendering environment (DRE) was concerned in this paper. Considering distributed animation rendering environment as the object of study, two Generalized Stochastic Petri Nets (GSPN) models for “completely distributed storage” infrastructure (CDSI) and “hybrid distributed storage” one (HDSI) were constructed respectively. Moreover, by choosing average time delay as the performance index, analysis was conducted by applying the equivalent formulas for solving Stochastic Petri Nets (SPN) models of serial and parallel types to these two GSPN models. Based on comparison of such models’ numerical simulation results, conclusion on these two infrastructures’ advantages and disadvantages is deprived thereby. It offers important quantitative foundations for choosing appropriate storage schemes and scheduling algorithms.

scholarly journals Numerical Simulation of Wave Interaction with Payloads of Different Postures Using OpenFOAM

2020 ◽  
Vol 8 (6) ◽  
pp. 433
Author(s):  
Mingwei Yan ◽  
Xin Ma ◽  
Wei Bai ◽  
Zaibin Lin ◽  
Yibin Li
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Wave Interaction ◽  
Normal Incidence ◽  
Projection Area ◽  
Published Data ◽  
Regular Waves ◽  
Simulation Experiments ◽  
Safe Control ◽  
Simulation Results

A three-dimensional numerical wave tank (NWT) is established with Open Source Field Operation and Manipulation (OpenFOAM) software and waves2foam to investigate wave interaction with payloads with different postures in the process of offshore lifting or lowering. Numerical results of regular wave interaction with a vertically suspending cylinder are presented first for validation by comparison with the published data. A series of simulation experiments are carried out, and the forces and the moments exerted by the regular waves on a fixed suspending cylinder payload and a fixed suspending cuboid payload with different postures are presented. It can be concluded from the results that the rotating rectangular payload (cuboid and cylinder) suffers a drastically changed moment when it is initially vertically placed, and the projection area of payload vertical to the force affects the corresponding force. The simulation results also show how the forces and the moments change with different posture angles. With some certain posture, the suspending payload suffers minimum forces and moments. Parametric study for the cuboid payload is done in the case of normal incidence. The influence of the payload’s size and wave parameters on forces and moments are analyzed. All of the numerical simulation results and conclusions provide the fundamentals for further research and safe control of offshore lifting or lowering.

Study of Thermal Stress of Steel Slag Foundation

2015 ◽  
Vol 744-746 ◽  
pp. 606-612
Author(s):  
Tao Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Thermal Stress ◽  
Theoretical Foundation ◽  
Steel Slag ◽  
Measured Temperature ◽  
Actual Situation ◽  
Academic Knowledge ◽  
Simulation Results ◽  
Comprehensive Discussion

Building on the foundation with steel slag as a typical example of the destruction of the thermo-elastic theory to study slag landfill foundation, combining academic knowledge mechanics, heat transfer, etc., the theoretical foundation of slag analysis and numerical simulation of thermal stress, a comprehensive discussion the failure mechanism of the upper part of the foundation of the slag building. On-site measured temperature were fitted by thermal stress analysis of steel slag field, get the corresponding stress-strain cloud. The results show close to the simulation results and the actual situation: simulating thermal stress results slag surface be uplifted 3.77cm, uplifting 5cm of building fundamentals actual.

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

ARCHITECTURE OF THE REPAIR AND MAINTENANCE MANAGEMENT SOFTWARE FOR A SERVICE ENTERPRISE

2020 ◽  
Vol 2020 (4) ◽  
pp. 53-59
Author(s):  
Dmitriy Titarev ◽  
Andrey Serikov ◽  
Sergei Krivtsanov
Keyword(s):  
Asset Management ◽  
Software Package ◽  
Service Management ◽  
Research Work ◽  
Maintenance Management ◽  
Management Software ◽  
Advantages And Disadvantages

The paper provides an overview of the architectures for the repair and maintenance management software package for a service enterprise. As part of the research work, asset management (EAM) and service management (ITSM) methodologies were studied. Three different architectures for the designed software package are proposed, their descriptions, advantages and disadvantages are given.

Tail shapes lead to different propulsive mechanisms in the body/caudal fin undulation of fish

2020 ◽  
pp. 095440622096768
Author(s):  
Jialei Song ◽  
Yong Zhong ◽  
Ruxu Du ◽  
Ling Yin ◽  
Yang Ding
Keyword(s):  
Numerical Simulation ◽  
Aspect Ratio ◽  
High Efficiency ◽  
The Body ◽  
Caudal Fin ◽  
Fish Model ◽  
Swimming Efficiency ◽  
Simulation Results ◽  
Propulsive Mechanism ◽  
High Depth

In this paper, we investigate the hydrodynamics of swimmers with three caudal fins: a round one corresponding to snakehead fish ( Channidae), an indented one corresponding to saithe ( Pollachius virens), and a lunate one corresponding to tuna ( Thunnus thynnus). A direct numerical simulation (DNS) approach with a self-propelled fish model was adopted. The simulation results show that the caudal fin transitions from a pushing/suction combined propulsive mechanism to a suction-dominated propulsive mechanism with increasing aspect ratio ( AR). Interestingly, different from a previous finding that suction-based propulsion leads to high efficiency in animal swimming, this study shows that the utilization of suction-based propulsion by a high- AR caudal fin reduces swimming efficiency. Therefore, the suction-based propulsive mechanism does not necessarily lead to high efficiency, while other factors might play a role. Further analysis shows that the large lateral momentum transferred to the flow due to the high depth of the high- AR caudal fin leads to the lowest efficiency despite the most significant suction.

Sign in / Sign up

Export Citation Format

Share Document