Search results

Numerical simulations of physical phenomena regarding the Fluid- Structure Interaction are topics of several research projects.
Using the explicit monolithic FSI-simulation within ANSYS CFX a bidirectional transient coupling with the ANSYS multiphysics solver was evaluated.
Results of the fluid dynamic simulations have been correlated with simulation of structural mechanics.
`CSM´ displays the resulting deformation of the fibre fabric depending on the fluid flow (row `CFD´).
CFD CSM Fig. 8.

CFD method has been used widely in the researches on the flow characteristic of airflow origination.
A numerical simulation was performed on characteristics of airflow origination in CRH2 EMU, adopting the method of LES with 10 PCs parallel operations in this article.
Simulation Method of LES Adopting filtering operations for incompressible N-S equations , quality equations and energy equation ,Eq.1 can be reached
In order to improve the accuracy of the simulation, the method of extended calculation boundary is used, the revised balance layer model is used for wall-function.
[5] Grotzbach: Direct Numerical and Large Eddy Simulation of Turbulent Channel Flows.

Before performing simulations on the main case decompression tank then first performed by grid independent test to validate the simulation results from the study by another researcher.
Thus, the simulation is correct and feasible to carry out simulations with different variations of compressibility.
This proves that the step from the simulation is already appropriately so worthy to be used for simulation study. 2.
CFD Simulation of Subcooled Flow Boiling using OpenFOAM.
Two phase pipe flow simulations with OpenFOAM.

Base on the model, the simulation was carried out at the experimental condition of Su et al. (1995).
But unlike normal bubbly flow, the vortex region below the cavity contain extremely high void fraction which may cause challenge for simulation.
In the vortex region, the simulation result is noticed to under-predict the void fraction in the area near the pipe centerline.
This may be caused by the phenomena of bubbles re-entrained into the cavity which is ignored in the simulation model.
Simulation results was found out to under-predict the Sauter mean bubble diameter in the pipe flow region for about 10%.

Sureshkumar et al. [3,4] studied the heat and mass transfer process between a water spray and ambient air by experiment and simulation.
Talukdar et al. [8] performed the convective heat and mass transfer between water surface and humid air flowing in a horizontal 3D rectangular duct by CFD simulation.
Simulations, Applied Thermal Engineering Vol.28 (2008), p.361-371
J.Simonson: Combined heat and mass transfer for laminar flow of humid air in a 3D rectangular duct: CFD simulation and validation with experimental data, International Journal of Heat and Mass Transfer Vol.51 (2008), p.3091–3102

The second phase fraction has been measured using Image analysis and Rietweld techniques to verify the simulation results.
The G and V were experimentally determined for directional solidification where as 2D heat transfer modeling was carried out in ComsolTM [6] CFD package to determine the G and V for the gravity casting experiments.
According to the present microsegregration simulation, the increasing trend of second phase fraction with cooling rate in directional solidification experiments (0.05-2.75 K/sec; G is almost constant and V is increases with cooling rate) is mainly due to the contribution of the solute (Al) back diffusion.
The 2D heat transfer simulation result for Cu mould casting (175 K/s) predicts V to be 0.015 m/s which is the highest value among all the experimental conditions in the present study.
Because G and V for the water quenching experiment could not be determined from the CFD simulation, we could not calculate the second phase fraction corresponding to this case.

Based on the operating characteristics of a micro HCCI (Homogeneous Charge Compress Ignition) free-piston engine, a multidimensional model which coupled CFD code, chemical dynamic model and piston dynamic model has been established.
Meanwhile, working characteristics of micro engine generator are evaluated by employing the simulation result.
Simulation result provides essential requirements for micro free-piston engine control and design.
Assuming the flow of combustible gas in the clearance as a quasi-one-dimensional isentropic flow and for a certain component, its leakage mass is expressed as: (5) Simulation results analysis Simulation of ignition process.
To invest micro engine performance with different fuels, simulations of fuel to be methane, propane and hydrogen respectively are compared.

A Monte Carlo photon simulation method was utilized for the analysis of optical performance of LED in quantitative terms.
FLOTHERM includes computational fluid dynamics (CFD) solver, which carries out a full 3-D solution of the Navier-Stokes equations for mass, momentum and energy conservation using the finite volume technique [5].
As a boundary condition during thermal simulation, heat transfer coefficient is important to ensure the accuracy of simulation result [3].
In our simulation, heat transfer coefficient was calculated by FLOTHERM based on CFD.
Lee: Analysis of light-emitting diodes by Monte Carlo photon simulation, Appl.

., Prosecká 809/76, Praha 93, 190 00, Czech Republic avladimira.michalcova@vsb.cz, bkuznetsov@itam.cas.cz, cpospisil@itam.cas.cz Keywords: aerodynamics, wind tunnel, bluff body, pressure coefficient, CFD, ABL, ELES Abstract.
Numerical simulation to determine the effects of incident wind shear and turbulence level on the flow around a building.
Wind tunnel test and numerical simulations of wind pressures on buildings in staggered arrangement.
Comparsion of Full-Scale and CFD Results for the Silsoe 6m Cube.
Large eddy simulation of wind over large roughness elements.

For the study of atmospheric diffusion of particles, it has the following several aspects: Using high-speed photography technology to film in wind-tunnel test and then take data analysis [1]; Conduct a method combined the experimental research and numerical simulation to get movement parameters and velocity distribution function of particles under different working conditions[2]; And using CFD to simulate the migration distance and sphere of action of the radioactive particles in atmospheric area[3].
Also, it provides an effective method for how to set up safety protection distance in nearby tailings area through the simulation of radioactive operating range of tailing sand.
Zhou: Study on Numerical Simulation of Defending Effect of Windbreaks, China, (2001)
[7] J.M.Hu: Numerical Simulation and Application on Windbreak Controlling Granule Raised up at Stack, (2003), P5-46
Xie: Numerical Simulation of Atmospheric Migration of Uranium Tailings Grit Based on DPM, Hengyang, China, (2013), P96-100