Thermal Radiative Properties of a Two-Dimensional Silicon Carbide Grating Mediated With a Photonic Crystal

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Weijie Wang ◽  
Yi Zhao ◽  
Wenchang Tan ◽  
Ceji Fu
Keyword(s):  
Numerical Simulation ◽  
Silicon Carbide ◽  
Photonic Crystal ◽  
Radiative Properties ◽  
Two Dimensional ◽  
Thermal Radiative Properties ◽  
Surface Phonon Polaritons ◽  
Magnetic Polaritons ◽  
Phonon Polaritons ◽  
Simulation Results

We present in this paper numerical simulation results of the thermal radiative properties of a two-dimensional (2D) rectangular SiC grating atop a photonic crystal (PC). The results show that surface phonon polaritons (SPhPs) can be excited by both TE and TM waves when they are scattered by the 2D grating. Excitation of SPhPs, PC modes, and magnetic polaritons (MPs), and interactions between them give rise to great enhancement of the emissivity. Distinct effects of the grating geometry on the resonance of SPhPs, PC modes, and MPs were revealed, which suggest a way to effectively manipulate the emissivity by tuning the structure's geometry. Furthermore, the results indicate that quasi-diffuse emissivity of the structure can be obtained for both TE and TM waves.

Thermal Radiative Properties of a 2-D Silicon Carbide Grating Mediated With a Photonic Crystal

2013 ◽  
Author(s):  
Weijie Wang ◽  
Ceji Fu ◽  
Wenchang Tan
Keyword(s):  
Photonic Crystal ◽  
Thermal Emission ◽  
Spectral Band ◽  
Radiative Properties ◽  
Two Dimensional ◽  
Thermal Radiative Properties ◽  
Polarized Waves ◽  
Geometry Dependence ◽  
Resonant Modes ◽  
Large Enhancement

We present in this paper numerical results of the thermal radiative properties of a two-dimensional rectangular SiC grating atop a photonic crystal, which is capable of exciting different resonant modes within a specified spectral band. We demonstrate that diffraction of waves in both extended directions of the two-dimensional grating, even for s-polarized waves, could efficiently give rise to excitation of surface phonon polaritons, which is responsible for large enhancement of thermal emission from the structure. However, the emission curves reveal different angle and geometry dependence for s- and p-polarized waves. Furthermore, due to the interaction of different modes, quasi-diffuse characteristics of thermal radiation from the proposed structure can be found for both polarizations.

Influence of Engine Cabin Simplification on Aerodynamic Characteristics of Car

2014 ◽  
Vol 1042 ◽  
pp. 188-193 ◽  
Author(s):  
Xing Jun Hu ◽  
Jing Chang
Keyword(s):  
Numerical Simulation ◽  
Aerodynamic Drag ◽  
Aerodynamic Characteristics ◽  
Thin Plates ◽  
Average Thickness ◽  
Two Dimensional ◽  
Engine Cooling ◽  
Aerodynamic Drag Coefficient ◽  
Simulation Results ◽  
The Impact

In order to analyze the impact of engine cabin parts on aerodynamic characteristics, the related parts are divided into three categories except the engine cooling components: front thin plates (average thickness of 2mm), bottom-suspension and interior panels. The aerodynamic drag coefficient (Cd) were obtained upon the combination schemes consisting of the three types of parts by numerical simulation. Results show that Cd by simulation is closer to the test value gained by the wind tunnel experiment when front thin plates were simplified to the two-dimensional interface with zero thickness. The error is only 5.23%. Meanwhile this scheme reduces grid numbers, thus decreasing the calculating time. As the front thin plates can guide the flow, there is no difference on the Cd values gained from the model with or without bottom-suspension or interior panels when the engine cabin contains the front thin plates; while only both bottom-suspension and interior panels are removed, the Cd value can be reduced when the cabin doesn’t contain the front thin plates.

Numerical Simulation of Small-Scale Explosion in Dry Sand

2013 ◽  
Vol 705 ◽  
pp. 110-114
Author(s):  
Yu Qing Ding ◽  
Wen Hui Tang ◽  
Xian Wen Ran ◽  
Xin Xu
Keyword(s):  
Numerical Simulation ◽  
Test Data ◽  
Detonation Product ◽  
Material Model ◽  
Small Scale ◽  
Two Dimensional ◽  
Material Models ◽  
Simulation Results ◽  
Dry Sand ◽  
Sand Material

Numerical simulation of small-scale explosion in dry sand using two sand material models including the Sand model and the LA model were carried out in the present study. Three cases were considered which the depths of burial (DOB) of the explosive C4 charge were 0, 30 mm and 80 mm, respectively. The time arrival of the blast-wave front and the maximum overpressure of fixed measuring locations were studied using a two dimensional axisymmetric model in hydrocode ANSYS/AUTODYN. Furthermore, the crater diameters and the heights of detonation product cloud respect to the time were also studied by comparing with the test data. The simulation results indicate that the both sand material models were hardly predict the test data exactly which proves that the sand properties and the material model should be more carefully studied and defined.

Midinfrared Index Sensing of pL-Scale Analytes Based on Surface Phonon Polaritons in Silicon Carbide

2010 ◽  
Vol 114 (16) ◽  
pp. 7489-7491 ◽  
Author(s):  
Burton Neuner ◽  
Dmitriy Korobkin ◽  
Chris Fietz ◽  
Davy Carole ◽  
Gabriel Ferro ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Surface Phonon ◽  
Surface Phonon Polaritons ◽  
Phonon Polaritons

Effects of Materials on Formation of Double-Layered Liners Shaped Charges

2009 ◽  
Vol 79-82 ◽  
pp. 1277-1280
Author(s):  
Yu Zheng ◽  
Xiao Ming Wang ◽  
Wen Bin Li ◽  
Wen Jin Yao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Simulations ◽  
Double Layer ◽  
Two Dimensional ◽  
Materials Properties ◽  
X Ray ◽  
Dimensional Finite Element ◽  
Simulation Results ◽  
Good Agreement

In order to study the effects of liner materials on the formation of Shaped Charges with Double Layer Liners (SCDLL) into tandem Explosively Formed Projectile (EFP), the formation mechanism of DLSCL was studied. Utilizing two-dimensional finite element dynamic code AUTODYN, the numerical simulations on the mechanical phenomenon of SCDLL forming into tandem EFP were carried out. X-ray pictures were obtained after Experiments on SCDLL. Comparisons between experimental results and numerical simulation results have good agreement. It can be concluded from the results that the materials properties and configurations of both liners are crucial to the formation of tandem EFP.

scholarly journals Prediction and numerical simulation of residual stress in multi-pass pipe welds

2021 ◽  
Author(s):  
Mahmood Hasan Al-Hafadhi ◽  
Gyorgy Krallics
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Residual Stresses ◽  
Hardness Test ◽  
Element Model ◽  
Good Prediction ◽  
Two Dimensional ◽  
Residual Welding Stress ◽  
Welding Stress ◽  
Simulation Results

AbstractA numerical simulation procedure is presented to predict residual stress states in multi-pass welds in oil transportation pipes. In this paper, a two-dimensional thermo-mechanical finite element model is used to calculate the temperature distribution, hardness, and the distribution of residual stresses during multi-pass welding of pipes of dissimilar metals and varying thicknesses. In this model, the temperature dependence of the thermal and mechanical properties of the material was considered. The present model was validated using the hardness measurement. Good agreement was found between the measurement and the numerical simulation results. The simulated result shows that the two-dimensional model can be effectively used to simulate the hardness test and predict the residual stress in the pipe weld. The simulation results and measurements suggest that the model with moving heat source can obtain a good prediction of residual welding stress. Both the two-dimensional and the three-dimensional modeling can be used to estimate the residual stresses in different weld regions and help saving time.

scholarly journals Supercontinuum generated high power highly nonlinear photonic crystal fiber for medical and optical communications applications

2018 ◽  
Vol 4 (2) ◽  
pp. 53-58
Author(s):  
Feroza Begum ◽  
Hazwani Suhaimi ◽  
Norazanita Shamsuddin ◽  
Martin Geoffrey Blundell ◽  
Yoshinori Namihira
Keyword(s):  
Numerical Simulation ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
High Power ◽  
Supercontinuum Generation ◽  
Crystal Fiber ◽  
Nonlinear Photonic Crystal ◽  
Highly Nonlinear ◽  
Supercontinuum Spectrum ◽  
Simulation Results

This paper investigates a supercontinuum generated high power highly nonlinear photonic crystal fiber for medical and optical communication applications. The full vector finite difference method with perfectly matched layer is used as an analysis tool. Numerical simulation results show that it is possible to achieve high nonlinear coefficient, near zero ultra-flattened dispersion, low confinement loss and supercontinuum spectrum with high power. Moreover, numerical results show that short length of the proposed photonic crystal fiber is achieved. The numerical simulation results of supercontinuum generation is conducted by solving the generalized nonlinear Schrödinger equation with the split-step Fourier method. It is observed adequate supercontinuum spectrum that broaden from 960 to 1870 nm by considering center wavelengths of 1.06, 1.31, and 1.55 μm into silica based index guiding photonic crystal fiber. This simulation results prove that the proposed design of a highly nonlinear photonic crystal fiber is a great solution for broad supercontinuum generation with high power.

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