Search results

In recent years, advanced computer and the mature computational fluid dynamics (CFD) commercial software developed fast, and using the CFD software to acquire hydrodynamic coefficients has the advantages of low cost, variable parameter, shorter time-consuming.
Steady-state maneuverability experiment simulation The simulation of PMM experiment includes steady –state motion simulation and unsteady-state motion simulation .Some parameters in the steady-state test simulation by Fluent should be set as follows: choose the first order implicit solver, SST turbulent model; choose SIMPLEC to compute velocity-pressure coupling; Pressure discretization is Standard and momentum discretization, turbulence kinetic energy discretization and specific dissipation rate are second order upwind.
Unsteady-state maneuverability experiment simulation The unsteady-state maneuverability experiment simulation includes heave motion, sway motion, pitch motion and yaw motion.
The results and the analysis 4.1 All the simulation of experiment is completed．
Hydrodynamic prediction results by simulation system The hydrodynamic coefficients of calculation are used to the simulation system of movement. 5.1 Straight course in horizontal plan.

In general, a computational fluid dynamics (CFD) study provides quantitative global flow data away from the wall or simply qualitative data [24].
It is interesting to note that the models developed as part of this CFD work could be a fondamental tool for vascular surgery during pre- and post-surgery.
Lee, P.Ho, Investigation of hemodynamics in the development of dissecting aneurysm within patient-specific dissecting aneurismal aortas using computational fluid dynamics (CFD) simulations, Journal of Biomechanics. 44 (2011) 827-836
Ramos, Aorta Ascending Aneurysm Analysis Using CFD models towards Possible Anomalies, fluids. 2, 31 (2017) 1-15
Geest, Simulation and probabilistic failure prediction of grafts for aortic aneurysm, Engineering Computations. 27 (2010) 84–105

Large Eddy Simulations of Flow past a Circular Cylinder With/without an Upper Rivulet Xiaoqing Du1, a,Yan Zhao1, b 1Department of Civil Engineering, Shanghai University, Shanghai, China axqdu.shu@gmail.com, bzh_yan@live.cn Keywords: Stay cable; Rain-wind-induced vibration; Upper rivulet; Large eddy simulation; Aerodynamic force coefficient Abstract.
Large eddy simulation (LES) is utilized to simulate flow around a circular cylinder with/without an upper rivulet at Reynolds number 70000.
With the improvement of CFD technology, CFD numerical simulation is also utilized in this research field.
Yeo and Jones [4] conducted a simulation of full developed turbulent flow past a yawed and inclined smooth circular cylinder at Re=1.4×105, and the detached eddy simulation (DES) method is adopted.
Finite Volume Method is introduced for spatial discretization in the simulation.

ANSYS and SPICE simulation results show that the proposed sensor can worked properly under 500K Pa, and the square sensing membrane of 100x100 mm 2 shows a good linearity over a pressure change ranging from 5 Pa to 500K Pa.
The total capacitors include Cfd, Cfs, Cfd and Cfb.
Main electrical parameters for SPICE simulation are shown below: channel length is 20mm, channel width is 50 mm, equivalent gate oxide thickness is 3.7 nm, channel doping density is 1.1´1015/cm2, and threshold voltage is -34.19 mV.
Fig.5 SPICE simulation results of the drain current with different pressure Summary In this paper, a floating-gate MOSFET pressure sensor with floating gate has been proposed, and the operation principle of the device in standard CMOS process has been discussed.
ANSYS and SPICE simulation results show that the proposed sensor can worked properly under 500K Pa, and the square sensing membrane of 100x100 mm 2 shows a good linearity over a pressure change ranging from 5 Pa to 500K Pa.

Coupled with the rapid development of CFD (Computational Fluid Dynamics) technology, numerical simulation for the cavitations flows, both can make up the shortcomings of theoretical analysis methods in complex cavitations problems applications and also save the cost of model test, moreover it can be accuracy, high speed, and can simulate the pattern of the flow field and get accurate flow characteristics without the impact the constraints inherent in testing.
The Physical model of simulation The simulation is for a model full-flow of the giant unit, which over-current components are: scroll, vanes, guide vanes, runner, draft tube.
Before the unsteady simulation, the standard k-ε model was used for the steady simulation, and the flow data upon steady simulation with will be as the initial conditions for the unsteady simulation.
The unsteady simulation will use the RNG k-ε model.
A CFD parametric study of geometrical variations on the pressure pulsations and performance characteristics of a centrifugal pump.

The model throughout all simulations was run at a constant speed of 1500 rpm.
Similar to these previous studies, the CFD (Computational Fluid Dynamics) tool used was the ANSYS-CFX 14.0 program.
Computer Modeling Computer modeling requires the development of simulation models, meshing and setting up boundary conditions before a simulation can be run.
The in-cylinder flow of the motored engine was studied using the commercial CFD package ANSYS; ANSYS-DesignModeller, ANSYS-Mesh and ANSYS-CFX [10].
Gil, CFD modeling of the in-cylinder flow in direct-injection Diesel engines, Computers & Fluids, 33 (2004) 995-1021.

(Simulation of separation is not the purpose of this article) Launch Vehicle Data The pilot launch vehicle is a single-stage solid propellant rocket with 104 seconds of burning time.
Simulating Flight Path Data processing by standard three degree of freedom simulation provides flight path, pitch angles and Mach number are extracted for power-on phase.
According to flight simulation outputs, pressure distribution in different Mach numbers is obtained by using FLUENT software CFD simulation.
Assumptions used for the simulation is as follows: To achieve more accurate results in performed simulations, the k-ε-RNG turbulence model is used.
In the simulation, the density is calculated using the ideal gas law.

A computational model of a GDI engine is established by 3D CFD simulation software.
Overall, the engine simulation technology has become more and more popular.
Ignition Timing Simulation Results.
Because of the limitations of experiments and simulations, the simulation of structural alignment is not modified.
Further simulations will be done to make the results more comprehensive and convincing.

And fluent 6.3 has been used to perform the simulation as the solver.
Fig. 2 shows the simulation result for case 1, case 2, case 3, case 4, and case 5.
And then in Fig. 2 the last two pictures show that simulation results for case 4, case 5.
Since the flow characteristics and turbulence kinetic energy are difficult to observe, the CFD studies can be an useful tool for researching the performance in the modern life.
Zhang: CFD Studies on the air flow in a double-grate biomass fired boiler (IEEE Computer Society, China 2010) [8] Y.B.

We use Fluent software to establish the model of flow field,and use numerical simulation method to analyze the erosion wear.
The numerical simulation can be largely reflect the results.
Therefore, the numerical simulation method is correct.
Numerical Simulation for the Motion of Dilute Solid Particles in Centrifugal Pump[J].
[5] Wang Zunce,Chen Si,Li Sen,Xu Yan,Numerical Simulation of Particle Impact Erosion within Eletric Submerible Pump Based on CFD[J].Oil Field Equipment,2013,42(5):31-34.