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Computer simulation plays major role in determining air flow, which can cause negative influence within historic buildings such as high level of moisture, fungus, chemical reactions etc.
Computer simulation Air flow in interior was computed in CFD software called Comsol.
This simulation can predict critical areas with low air flow velocity.

It is shown that the analytical results are in good agreement with numerical simulations, which also show that the pressure coefficient over the collar surface has the same trend as given by computational simulation.
Furthermore, to find the best thrust deflection angle and the best nozzle performance, numerous simulations are investigated based on various nozzle design parameters.
Fig. 3 shows the computational grid for CFD simulation in symmetry plane and in adjoining plane.
The governing equations for flow simulation include conservation of mass (continuity), momentum, energy for a perfect gas and also k and ε equations of the turbulence model.
Three-dimensional numerical simulations are presented using a computational fluid dynamics code.

To clarify the principles that narrow channel effects the gas deflagration flame propagation, this paper compares different potential factors, such as various narrow spacing and different initial gas deflagration velocity, which suppress flame propagation based on CFD (Computational Fluid Dynamics) numerical simulation.
Numerical simulation Model description.
As Distance D compared with the narrow length L and width (z direction) is much smaller, we can treat this physical model as an infinite parallel plate gap to leave only x and y directions for simulation.
Validation To validate the numerical results, data of the simulation had been compared with experimental data of a previous literature under the same conditions as be shown in Figure 8.
Conclusion A computational simulation adopting PISO algorithm and self-adapted grids was developed based on the single-step irreversible chemical reaction and the combustion model of EBU-Arrhenius.

Design simulation of compressor impeller was presented by using investment casting technique.
The design simulation begun with varies of temperature inlet from 300 K to 400 K.
The simulation has been generated by using ANSYS CFX software.
“A Turbocharger Unsteady Performance Model for the GT-Power Internal Combustion Engine Simulation.”
“Design Improvement of Turbocharger Using CFD.”

Methods and Simulation Compliant Wall.
Numerical Simulation.
Turbulence over a compliant surface: numerical simulation and analysis.
Research on Method for Optimization Design of Riblets Angle Based on CFD Techniques.
Journal of System Simulation.11(2006),3073-3094

An Open Source CFD software Open Foam has been used to study the above effects.
Results To carry out the simulations and solve all the equations, a C++ code “radLBL” has been developed.
Mosbach, Two-dimensional numerical simulation of a decaying laser spark in air with radiation loss.
Mahesh, Numerical simulation of the fluid dynamic effects of laser energy deposition in air.
Modest, M.F., Backward Monte Carlo simulations in radiative heat transfer.

Numerical methods STAR-CD 4.12 is used as a solver and post processor tool for the simulation of the system.
[2] Felix Birkhold ,Ulrich Meingast, Peter Wassermann, and Olaf Deutschmann: Modeling and simulation of the injection of urea-water-solution for automotive SCR DeNOx-systems Sciencedirect, Applied Catalysis B: Environmental 70. (2007)
[4] Soo-Jin Jeong, Sang-Jin Lee, Woo-Seung Kim and Chun Beom Lee: Simulation on the Optimum Shape and Location of Urea Injector for Urea-SCR System of Heavy-duty Diesel Engine to Prevent NH3 Slip, SAE Technical paper series, 2005-01-3886. (2005)
Bressler, F.Terres, H.Neumaier, and D.Rammoser: Optimization of catalytic converter gas flow distribution by CFD prediction.

The present study on internal combustion engine exhaust noise usually by use computer simulation combined with practice [1-4].Experiment and simulation combination can improve the precision of the model, and improve the credibility of the model.
References [1] Broatch A, Margot X, Gil A.A CFD approach to the computation of the acoustic response of exhaust mufflers.
Simulation Prediction and Experimental Study on Exhaust Noise of Engine[J]，China Mechanical Engineering,2011,22(14)：1664-1668. in Chinese

The third one is simulation results and discussion.
Simulation and Discussions In this section we use ESI-CFD+ software package for simulation.

A New Composite Method of Hole Cutting WU Yuan1, a, Chao Yan1,b , Jian Yu1,c and Ke Xi1,d 1Beijing University of Aeronautics and Astronautics, Beijing, China axhhimhoy@163.com bchyan@vip.sina.com cswordfish612@163.com dcauchy86@163.com Keywords: CFD, chimera, hole cutting, hole-map, ADT Abstract.
The simulation condition is: Ma=3.0, Height=10km, angle of attack=0.
The overlapping grid of submunition and the isoline of flow simulation are presented in Fig.12.
The overlap grid and isolines of flow simulation Summary In this paper, the traditional hole-map method is analyzed, indicating there are two major flaws exist in terms of storage and reliability.
[10] Buning P: Numerical algorithms in CFD post-processing, Computer Graphics and Flow Visualization in Computational Fluid Dynamics, Lecture Series 1989-07, Von Karman Institute for Fluid Dynamics, Brussels, Belgium, 1989