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Study of wave added resistance on Wigley ship Tao Sun1,a, Minghui Yuan2,b, Wei Wang3,c, Nan Ye4,d 1,2,4College of Power and Energy Engineering, Harbin Engineering University, Harbin, China 3703th Research Institute of China Shipbuilding Industry Corporation, Harbin, China aheu_jf@163.com, b617871483@qq.com, ccsic703ww@163.com, dghostyenan@163.com Keywords:. wave added resistance, Wigley, numerical simulation ,resistance in head wave, trim and heave Abstract.
At present, studying ship wave added resistance by numerical simulation just starts, this paper was carried out in this background.
Summary and Conclusions The most useful purpose served by the study is the use of numerical simulation to solve ship resistance issue.
The viscous flow of both restrained and free body are simulated by CFD method .The resistance in calm water and head waves of two models are computed here, especially , different wavelengths and amplitudes are considered.

With the development of computer technology and CFD (computational fluid dynamics), it is desirable to directly solve the Navier–Stokes equations for the simulation of many problems of free-surface flow to understand natural hydrodynamic processes.
(4) Simulation Results and Discussion Dam break over a dry bed.
From all these simulations, better agreement can be seen in the simulation with free-slip boundary condition.
From above, the two-phase model shows its ability for the simulation of free surface problems.
In the following simulations, we have chosen to be equal to 1 and 0.9, respectively.

Simulation result was shown in Fig.4.
In order to verify the accuracy of the simulation results, the comparison of simulation results with experimental data of periodical was made[6].
Simulation result was shown in Fig.5.
Simulation result was shown in Fig.6.
[4] Nguyen T D B, Lim Y, Kim S, et al．Experiment and computational fluid dynamics (CFD)simulation of urea-based selective non-catalytic reduction (SNCR) in a pilot-scale flow reactor[J]．Energy & Fuels, 2008, 22(6) : 3864-3876

In such cases both cost and time can be reduced by adopting numerical simulations.
Recently Fabio Ferraro et al [14] have done parametric study of shock wave simulations using COMSOL multiphysics.
The simulation results are also compared with the experimental results.
The commercial CFD package ANSYS-FLUENT is used to model the shock tube.
The Von-Mises strain and mid-point deformation from simulations closely agree with experimental values.

To study the effects that land layouts around the square lay on the city square microclimate in winter cities, this paper takes St Alekseev Church as a model and uses the method of numerical simulation CFD to study 8 different land layouts in winter climate conditions.
It takes wind velocity and relative temperature field into consideration mainly in the simulation when analyzing the square microclimate.
According to winter meteorological data in Harbin, the average temperature is-19.4℃in the coldest month-January 15th, so we set the simulation time at 11:15 in January 15th.
The results of wind velocity simulation can be seen in Table 2.
The results of temperature simulation can be seen in Table 3.

Choose simulation outputs; 14.
Run simulation; 15.
Visualize simulation results.
Regarding Accuracy and ability (AADCC) it can be stated that the environments offer a multitude of connection to established simulation engines, encompassing the majority of building performance related domains, such as hygro-thermal analysis, lighting, acoustics, or CFD.
Department of Energy - https://energyplus.net/ (last accessed July 2017) [14]OpenFoam, The open source CFD toolbox - https://www.openfoam.com/ (last accessed July 2017) [15]Radiance – A validated Lighting Simulation tool - https://www.radiance-online.org/ (last accessed July 2017) [16]DaySim – Advanced Daylight Simulation Software - https://daysim.ning.com/ (last accessed July 2017) [17]Therm – Thermal Modelling Solutions - https://www.psitherm.uk/ (last accessed July 2017) [18]OpenStudio - https://www.openstudio.net/ (last accessed July 2017)

Steady flow simulations inside a driven cavity up to Reynolds number 35000, J.
Dass, Simulation of incompressible flows in two-sided lid– driven square cavities.
FDM, CFD.
LBM, CFD.
Wilcox, Turbulence Modeling for CFD, DCW Industries, Inc., La Canada, California, 1998

In this paper, the detail numerical simulations were performed on the flow field of the scramjet combustor chamber with the hydrogen fuel, when the cavity parameters changed.
In this paper, the detail numerical simulations were performed on the flow field of the scramjet combustor chamber with the hydrogen fuel, when the cavity parameters changed.
The CFD code “Fluent” is used in the numerically analysis, it is a finite volume code for solving the Reynolds-averaged Navier-Stokes equations.
Gaitonde: Numerical Investigation of a 3-D Chemically Reacting Scramjet Engine at High Altitudes Using JP8 - Air Mixtures, AIAA2005-1435 [7] Yang Shi-min, Tang Hao, Huang Yue: Numerical Simulation of Combustion Flow Field of Supersonic Combustor with Cavity, Journal of Aeroengine, Sep. 2008.

To allow the optimisation of the system and ensure proper processing of the air passing through the chambers, the CFD simulation was used at the design stage.
The simulation aimed at obtaining the flow homogenisation of the exhaust air and providing the effect of mixing of air-streams in the chamber.
Kosowska, Zastosowanie metod CFD w projektowaniu przepływowej komory kalorymetrycznej symulującej warunki klimatu wewnętrznego w budynku mieszkalnym.
Wojnar, Zastosowanie metod CFD w projektowaniu przepływowej komory kalorymetrycznej symulującej zimowe warunki klimatyczne.

Simulation shows the performances of improved mufflers were better than the original one.
Bench tests of engine draw power loss is 1.39%, while the PL of CFD for the muffler is 1863Pa in same speed condition, both number orders are basically on the same level [6].
These show the simulation model of fluid is accurate as well.
Simulation of acoustic performance Acoustic performances are calculated with the method of finite element.
P.Wei and W.He.in: Application of flow field simulation technique to the study of exhaust noise of car Source [C].