Search results

Based on the flow fluid simulation of incompressible flow, according to the design parameters of water hydraulic slide valve, CFD software Fluent is used to simulate and analyze the flow characteristics of water hydraulic slide valve.
The simulation model of Slide valve with rectangular openings has been built, and different combinations of boundary conditions are specified to make comparisons so as to ensure the correctness of the simulation.
In order to design an applicable water hydraulic servo valve, it's necessary to study the factors which influence the static characteristics of the slide valve with CFD software Fluent.
CFD simulations can avoid the construction and testing of many prototypes, and then reduce the R&D cost and time, and the accuracy has been confirmed on many occasions [2,3].
Simulation Model of Slide Valve with Rectangular Openings Evaluation Conditions.

The Research of the Servovalve Noise Yuan zhang Chen1,a, Da ping Gong2,b 1 Nanjing Engineering Institute of Aircraft Systems, Aviation Key Laboratory of Science and Technology On Aero Electromechanical System Integration , Jiangsu, Nanjing 2 Nanjing Engineering Institute of Aircraft Systems, Jiangsu, Nanjing a yuanzhang0609@sina.com,b gdp@avic.com Keywords: CFD; servovalve; flow-induced vibration (FIV);noise; hydro-oscillation force Abstract: Use Gambit and Fluent to the servo valve armature component of squeak problem undertook CFD is analyzed, simulates the flow field distribution in internal circuit structure, found in the servo valve armature component whistle when fluid in the inner of the product, produced a marked a negative pressure zone, and in this context the armature assembly stress sharply change, causing the armature assembly vibration squeal, changing the internal structure of the product again CFD simulation, negative pressure area disappeared, the pressure change
The paper is based on CFD technology, it will study and analysis the problem that flexure tube whistle in batches occurs during the manufacture process of a type of servovalve, and make appropriate solution, to eliminate the servovalve howling by using CFD technology. 1 Test Procedure In the paper the armature component structure is shown in Figure 1, the armature plays the role in driving of the servovalve, the flexure tube is employed to play the role not only in a spring support for armature-flapper assembly but also in a sealing between electromagnetic and hydraulic parts, deflector distribute liquid flow.
Analysis on the phenomenon. 2 CFD Solution In the test, the armature vibrates so much as produces noise just because of flowage, it belongs to the classical flow-induced vibration problem, basic equation is:
In the experiment , as the structural component the armature component is the stock-still part, it can’t vibrate because of itself machine movement, so the nonlinear item is able to ignore and just considering of the hydro-oscillation force .[1] It can obtain hydro-oscillation force by CFD.
Figure 15 Geometry of the profile Figure 16 The pressure along axis Installed the structural-change experimental sample on the test bench, then run a test, 5 pieces of the armature test-components did not produce a vibrating howling, and in the whole process of the servovalve installation and debugging, it did not appear servovale high-frequency howling phenomenon. 3 Conclusions 1) the paper reproduces the servovalve flexure tube howling phenomenon by experimental simulation, it provides the experimental basis for the theoretical analysis. 2) it simulated the flow field distribution of servovalve armature component through Gambit, Fluent software, founded that when there was high-frequency whistle in servovalve armature component, there would produce a obviously negative pressure region in the internal armature component, and with a great deal of pressure drag and flow - Induced vibrations. 3) in the paper it changed the product’s internal structure, simulated again through CFD

Simulation Research of the Impact on the Heat Transfer Capability of Structural Changes in Casing Heat Exchanger Baisheng Liaoa School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China alonely816@163.com Keywords: Numerical Simulation, Casing Heat Exchanger, CFX CFD Software Abstract.
The simulations used CFX CFD software of ANSYS company.
The simulations used the ICEM CFD software to draw pre-treatment geometric model and mesh, grid model, respectively, according to eccentricity of three cases 0, 1, 2 mm, the structure of the eccentric 0, the typical heat exchanger tube structure, it is constituted by two concentric tubes, fluid flow in the pipe and heat transfer is symmetrical, therefore, simulation can be modeled though only a quarter of the circumference of the heat exchanger.
It can be seen by the model, the simulation is two-dimensional simulation.
It can be seen, these two structures are three-dimensional simulation of the simulation.

This study presents a hybrid CFD-ML model for liquid filtration systems, overcoming limitations of traditional approaches.
To enhance computational efficiency, machine learning algorithms, specifically neural networks, are trained on CFD simulation data to predict flow characteristics, such as velocity profiles and pressure drops, under varying conditions.
The hybrid model reduced simulation time by 65%, averaging 12 minutes per run versus 34 minutes for CFD, due to its machine learning component.
Model Performance Comparison Model Type RMSE [%] Simulation Time [min] Permeability Deviation [%] Hybrid Model 2.3 12 4.8 Standard CFD 8.7 34 10.2 Darcy-Based 12.4 5 15.6 Simulation results elucidated key hydrodynamic parameters for a nanofiber membrane with a 0.5 μm mean pore size and 0.75 porosity, under an inlet velocity of 0.1 m/s.
The model’s computational efficiency, reducing simulation time by 65% compared to CFD, facilitates its use in iterative design and real-time optimization.

University of Feres Yahia, Medea, Algeria aboualemlaribi@yahoo.com, blmp2m_cum@yahoo.fr Keywords: Turbulence, CFD, flow meter, flow conditioner, Navier-Stokes, k-ε.
For the simulation, code CFD Fluent was used.
The numerical analysis is conducted by the CFD Fluent code [7].which is based on the resolution of the Navier-Stokes equations with k-ε like turbulence model.
Experimental Facility for the Simulation Our installation, Fig. 1, consists of an inlet pipe length 10D, followed by disturbers 90° double bend, or a valve, or a Tee, Fig. 2.
The effectiveness of CFD code Fluent to predict flow development in different installations is done where good predictions are presented.

CFD is a good tool for the study.
The numerical simulation of flows is achieved by CFD (computational fluid dynamics).
CFD presents the orientation of flow study.
The first task of CFD is grid generation.
Numerical Simulation of Flow in Flowrate Measurement Section of Natural Gas Pipelines.

The aim of present study is to investigate this innovative design from aerodynamic point of view by means of validated CFD techniques.
The commercial CFD package ANSYS Fluent and the implemented 6DOF solver[8] have been utilized in order to conduct unsteady flow-driven simulation over whole turbine operating range.
Reference Configuration Double-stage Configurations Main Rotor Assist Rotor blade airfoil blade chord length [mm] rotor radius [m] blade length [m] moment of inertia[kg.m2] NACA 0018 83 0.375 1 0.0225 NACA 0018 83 0.375 1 0.018 NACA 0018 83 0.1875 1 0.0045 A validated 2D CFD simulation setup from a recently published work [3] have been employed.
Regarding negligible variations witnessed in primary simulation results having shorter time step sizes, an optimum time step of 0.001 sec has been prescribed for present calculations in order to reduce computational time.CFD simulations were conducted by parallel processing and the residual convergence criterion was set to 1×10e-4 for all solution variables.
Time series of angular momentum for the reference and the double-stage configurations at wind speed of 6m/s Conclusion The newly proposed double-stage rotor design is successfully investigated by means of CFD simulation in present research.

This is achieved through physical erosion experiments and Computational Fluid Dynamics (CFD) simulations which are well suited to interpret the effect of particle dynamics and fluid mechanics on erosion in multiphase flows.
This paper will employ both physical multiphase erosion experiments and CFD simulations to address this gap in the literature.
CFD Campaign CFD Modelling Details.
The simulations follow the recommended practices in multi-phase flow specifically (ANSYS, 2012), and CFD in general.
This shows that the current CFD erosion methodology to account for transient flow features requires further model refinement as it relates to low-Stokes number particle simulations.

CFD-based design of the natural ventilation system of the traffic center of T3 in Beijing International Airport Jinsheng Ma1, a, Xintao Liu2, b, Damin Zhuang3, c , Shaoguo Wang4, d 1,2 School of Mechanical Engineering and Automation, Beihang University, Beijing, China 3School of Aeronautic Science and Engineering, Beihang University, Beijing, China 4Beijing Aviation Oil Engineering Consultation Company, Beijing, China axtliu0407@gmail.com Keywords: CFD, GTC, natural ventilation, simulation, energy-saving, environmental protection Abstract.
With methods of CFD, and from the perspective of the Energy Saving and Environmental Protection, natural wind and related technology are utilizes, and natural ventilation and heat transferring guidance systems are designed, so that the internal temperature is reduced and the indoor comfort is improved.
Generally believed that, no matter how complex turbulent flow is, three-dimensional, unsteady Navier-Stokes equations is still applicable for turbulent instantaneous movement, so numerical method of turbulence simulation also focus on the numerical solution of the three-dimensional unsteady Navier-Stokes Equations.
Research and Simulation of Natural Ventilation Geometric modeling, boundary conditions and setting of the Fluent parameters Size of calculation model refers the size of prototype model, and the size of computational domain of ellipsoid is(50×300×50 m3); Boundary condition: coming flow is shear flow, and turbulence characteristics directly give the turbulent kinetic energy and turbulence dissipation rate by UDF; Outlet boundary conditions: fully developed outflow boundary conditions; Building surface and ground: wall conditions with no slip; In setting of Fluent 6.0, the solver is pressure-based, and turbulence model uses the standard model.
At different wind speeds, through the simulation analysis of the velocity field, temperature field and pressure field inside, it can be concluded that when the wind speed of the inlet is 10m/s, needs of human comfort is able to be met. 3.

., University Politehnica of Bucharest, Faculty of Aerospace Engineering, 1-7 Polizu Street, 011061, Bucharest 1, Romania acicangrig@yahoo.com, bcrunti_dani@hotmail.com Keywords: numerical simulation, CFD, Gambit, noise control, chevron, acoustic intensity level.
Based on the gas dynamic and geometrical parameters of a single flow jet engine one does a model of CFD data processing.
Present study includes also a case study with a reaction nozzle that has in use the triangular chevrons and reveals the effects on the noise pollution and the propulsion force using CFD .
Computational results The numerical simulations were performed with commercial CFD code Ansys Fluent [6], and the results obtained are presented as follows: Fig. 6 Velocity distribution along Ox axis for the nozzle with 6 chevrons Fig. 7 Radial velocity distribution for different sections of the computational domain Fig. 8 Acoustic intensity level distribution for the nozzle without chevrons Fig. 9 Acoustic intensity level distribution for the nozzle with 6 chevrons Fig. 10 Acoustic intensity level distribution depending on the number of chevrons Fig. 11 Exit nozzle velocity distribution depending on the number of chevrons Fig. 12 Acoustic intensity level distribution depending on the dip angle Conclusions As a result of the numerical simulations one concludes that the triangular chevron helps to reduce with some dB the acoustic intensity level, results that are similar to those obtained in some experimental papers[7,8].