scholarly journals Broadband near-field radiative thermal emitter/absorber based on hyperbolic metamaterials: Direct numerical simulation by the Wiener chaos expansion method

2013 ◽  
Vol 87 (11) ◽  
Author(s):  
Baoan Liu ◽  
Sheng Shen
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Near Field ◽  
Expansion Method ◽  
Chaos Expansion ◽  
Hyperbolic Metamaterials ◽  
Wiener Chaos ◽  
Thermal Emitter ◽  
Wiener Chaos Expansion

Wiener chaos expansion method for thermal radiation from inhomogeneous structures

2021 ◽  
Vol 104 (19) ◽  
Author(s):  
Zhuo Li ◽  
Jiayu Li ◽  
Xiu Liu ◽  
Hakan Salihoglu ◽  
Sheng Shen
Keyword(s):  
Thermal Radiation ◽  
Expansion Method ◽  
Chaos Expansion ◽  
Wiener Chaos ◽  
Wiener Chaos Expansion

Direct Numerical Simulation of Near Field Thermal Radiation Based on Wiener Chaos Expansion of Thermal Fluctuating Current

2010 ◽  
Vol 132 (7) ◽  
Author(s):  
Sy-Bor Wen
Keyword(s):  
Thermal Radiation ◽  
Green’S Function ◽  
Green's Function ◽  
Function Method ◽  
Near Field ◽  
Classical Solutions ◽  
Chaos Expansion ◽  
Green’S Function Method ◽  
Wiener Chaos ◽  
Wiener Chaos Expansion

A methodology is proposed, which is capable of determining the near field thermal radiation based on the Wiener chaos expansion. The approach has no explicit constraints on the geometry and temperature distributions of the system and can be easily included with classical electrodynamics simulations. A specific application is made for the near field thermal radiation between two plates and the results are in very good agreement with the classical solutions obtained from Green’s function method. Also, by comparing the resulting solutions with the solutions from Green’s function method, a new point of view for interpreting the results for the near field thermal radiation in terms of a chaos expansion is provided.

Model for efficient simulation of spatially incoherent light using the Wiener chaos expansion method

2007 ◽  
Vol 32 (21) ◽  
pp. 3188 ◽  
Author(s):  
Majid Badieirostami ◽  
Ali Adibi ◽  
Hao-Min Zhou ◽  
Shui-Nee Chow
Keyword(s):  
Expansion Method ◽  
Chaos Expansion ◽  
Incoherent Light ◽  
Wiener Chaos ◽  
Efficient Simulation ◽  
Wiener Chaos Expansion

Three-dimensional direct numerical simulation of a turbulent lifted hydrogen jet flame in heated coflow: a chemical explosive mode analysis

2010 ◽  
Vol 652 ◽  
pp. 45-64 ◽  
Author(s):  
T. F. LU ◽  
C. S. YOO ◽  
J. H. CHEN ◽  
C. K. LAW
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Near Field ◽  
Three Dimensional ◽  
Mode Analysis ◽  
Scalar Dissipation ◽  
Complex Flows ◽  
Jet Flame ◽  
Auto Ignition ◽  
Grid Points

A chemical explosive mode analysis (CEMA) was developed as a new diagnostic to identify flame and ignition structure in complex flows. CEMA was then used to analyse the near-field structure of the stabilization region of a turbulent lifted hydrogen–air slot jet flame in a heated air coflow computed with three-dimensional direct numerical simulation. The simulation was performed with a detailed hydrogen–air mechanism and mixture-averaged transport properties at a jet Reynolds number of 11000 with over 900 million grid points. Explosive chemical modes and their characteristic time scales, as well as the species involved, were identified from the Jacobian matrix of the chemical source terms for species and temperature. An explosion index was defined for explosive modes, indicating the contribution of species and temperature in the explosion process. Radical and thermal runaway can consequently be distinguished. CEMA of the lifted flame shows the existence of two premixed flame fronts, which are difficult to detect with conventional methods. The upstream fork preceding the two flame fronts thereby identifies the stabilization point. A Damköhler number was defined based on the time scale of the chemical explosive mode and the local instantaneous scalar dissipation rate to highlight the role of auto-ignition in affecting the stabilization points in the lifted jet flame.

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