Search results

Numerical Simulation Study of Coal Gangue Piles Influence on the Wind Pressure Distributions of Coal Reservoir Roofing Zhixiang Yin1, a, Chengjie Zhang2,b 1Institute of Civil Engineering and Transportation, Liaoning Technical University, Fuxin123000, P.
China alntuyzx@163.com, bzcj198642@126.com Keywords: coal reservoirs, coal gangue, numerical simulation, wind coefficient, influence Abstract.
Therefore, this paper studies the impact of the waste dump on the wind pressure coefficient, based on the proven reliability in the numerical simulation[3].
Numerical wind tunnel method is based on computational fluid dynamics (CFD), and simulates wind field changes around the structure and calculate the wind load on the structure surface by the computer [4].
Examining the k-ω model by means of a wind tunnel test and large-eddy simulation of the turbulence structure around a cube [J].

Through theoretical analysis and numerical simulation, take "Siamese model” results as the boundary condition and establish a mathematical model of rail transit hub with CFX.
Through theoretical analysis and numerical simulation, take "Siamese model” results as the boundary condition and establish a mathematical model of rail transit hub with CFX.
This paper fully considered the actual situation of the rail transport hub, reference [3] to reach 6.22MW in 600s with heat release rate of t2 as fixed fire load, and to reach 0.026 Kg/s in 600s with gas release rate of t2 as smoke production volume in numerical simulation.
Mesh and boundary conditions ANSYS ICEM CFD is used to establish the physical model, use hexahedral mesh, and the grid is about 100 million with local location refinement of fire source and outlet.
Simulation results and analysis Suppose that the fan was set in 60s after the fire broke out and turn to normal operation in 90s.

With the method of Computational Fluid Dynamics(CFD), aerodynamic characteristics and longitudinal static stability of the conventional airship and new winged airship were comparative investigated.
Geometry Modeling 3D model of conventional airship and new winged airship used in the numerical simulations are of the same size and their only difference is that the winged airship adds a wing at the backward of the hull.
During the simulation three dimensional Reynolds Averaged NS equations (RANS) were used and coupled pressure-velocity solution was selected.
In order to ensure the simulation accuracy, realizable k- turbulence model was selected for the calculation.
Journal of Computer Simulation.

The use of CFD codes, particularly those employing LES [5], is very useful for fire modelling, predicting plume characteristics, combustion products dispersion and heat transfer to adjacent bodies.
Ryder et al. [6] consider the FDS software, which was developed by the NIST (National Institute of Standards and Technology – USA), more suitable for simulation of complex geometries in actual explosion and fire analysis than multipurpose CFD codes.
Table 1 presents fuel properties used in the simulations.
Results and Discussions Simulations considering gasoline type C.
The numerical simulation was performed neglecting wind effects.

The simulation results indicated that the effects of nozzles with different angles on the pressure at the thrustwall of PDE and nozzle outlet were not the same.
Since the design theory of PDE nozzle is not perfect, many numerical simulations were performed by domestic and overseas scholars in recent years.
Venkat [3] performed two-dimensional numerical simulation on PDE performance with convergent nozzles, divergent nozzles, convergent-divergent nozzles and straight nozzles for two different flight conditions, whose results indicated that the specific impulse of PDE with divergent nozzles was higher than that of PDE with other nozzles at a subsonic speed.
In order to obtain the effect rule of different nozzles with convergent and divergent angles on PDE performance, systematic numerical simulations on PDE with nozzles of different angles was carried out in this article.
Physical Model and Computing Method In this paper commercial CFD software Fluent was used for numerical simulation.

The mesh was made with the support of ICEM-CFD 11.0, which after various refinements resulted in an unstructured mesh of 760,786 tetrahedral elements.
The simulations were run in a Quad Core 2.66 GHz, 8 GB of RAM and 1 TB of physical memory (HD) computer.
The simulation time of the cases studied ranged from 43 to 46 hours.
Table 2 - Data used in the simulation, considering the isothermal method.
In the simulations we used the conventional method of recovery with continuous injection of water under isothermal conditions.

Extensive CFD modelling of cooling using nitrogen jets showed that an array of high velocity gas jets close to its surface could cool the part at a similar speed to oil.
The model When the rig had been constructed it was modelled in three dimensions with Fluent 6.0.12 CFD code.
The heat transfer data from Fluent was therefore applied to a carburised section in a metallurgical simulation program (Dante).

The simulation method has been presented by analyzing difference scheme for governing equations.
Numerical simulation on each time period is solved using the steady-state method.
Result and analysis Simulation Condition and Result.
The simulation results are illustrated in Fig.1.
Hydrodynamic design of pump diffuser using inverse design method and CFD.Journal of Fluids Engineering, Transactions of the ASME, Vol. 124, No.2 pp. 319-328, Apr. 2002

Figure 6 is the numerical simulation of the overall distribution of the radial slip velocity.
Advances in Numerical Simulation of Working Process in Gasoline Engine [J].
Numerical Simulation of Air Flow in an Engine Inlet Port[J].
The Application of CFD in Designing Internal Combustion Engine [J].
Study on the 3D Simulation of Combustion Process of the Gasoline Direct Injection Engine[J].

Introduction During the design of hydraulic machinery, processing and numerical Simulation Study, generally need to create an accurate physical model.
With the CFD technology is widely used in the field of hydraulic machinery, the modeling capabilities of researchers is also increased correspondingly.
The establishment of an accurate physical model is an important first step if researchers want to obtain accurate simulation results.
Accurate three-dimensional digital model is required in the numerical simulation study on the runner, if the modeling method is incorrect, that may lead to abnormal irregularities and bring the error to the simulation results.
When conduct the numerical simulation, due to the narrow blade and a larger degree of spatial distortion, coupled with the combination of long blades and short blades, there is a certain degree of difficulty to establish the model, improper methods are likely to have an adverse impact on the results of simulations.