Discrete Green’s functions and spectral graph theory for computationally efficient thermal modeling
Discrete Green’s functions and spectral graph theory for computationally efficient thermal modeling
复制标题
离散格林函数和谱图理论,用于计算高效的热建模
DOI:
10.1016/j.ijheatmasstransfer.2021.122112
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发表时间:
2022
影响因子:
5.2
通讯作者:
Rao, Prahalada K.
中科院分区:
文献类型:
--
作者:
Cole, Kevin D.;Riensche, Alex;Rao, Prahalada K.
This work concerns solutions of the heat equation with the spectral graph method, for which the temperature is defined at discrete points in the domain and the spatial relationship among the points is described by a graph. The heat equation on the graph is solved using matrix techniques involving the eigenvectors and eigenvalues of the Laplacian matrix. The spectral graph approach precludes the computationally intensive meshing and numerous time-integration steps of the finite element method. In the present work, the spectral graph method is extended to include heat loss at the boundaries with a generalized boundary condition, and physics-based edge weights are introduced which simplify the calibration process. From this approach a discrete Green’s function is defined which allows for solutions under a variety of heating conditions including: space-varying initial conditions; time-and-space varying internal heating; and, time-and-space-varying heating at boundaries of type 1 (Dirichlet), type 2 (Neumann) and type 3 (Robin). Results are provided for benchmark heat transfer problems in one spatial dimension and in three spatial dimensions, and verification is provided by comparison with exact analytical solutions and finite difference solutions. The spectral graph method converges within 0.4% error of the analytical solution. The practical utility of the approach is demonstrated by thermal simulation of a multilayer additive manufacturing process. The spectral graph results are compared to experimentally-obtained temperature data for two metal parts, with error less than 5% of the experimental measurements, with computation time less than one minute on a desktop computer.
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DOI:
10.1016/j.ijheatmasstransfer.2020.120692
发表时间:
2021
影响因子:
5.2
作者:
B. Çetin;Yiğit F. Kuşcu;B. Çetin;Ö. Tümüklü;K. Cole
通讯作者:
K. Cole
DOI:
10.1016/s0195-6698(03)00029-5
发表时间:
2003
期刊:
Eur. J. Comb.
影响因子:
--
作者:
E. Bendito;Á. Carmona;A. Encinas
通讯作者:
A. Encinas
DOI:
10.1115/1.4043648
发表时间:
2019
期刊:
Journal of Manufacturing Science and Engineering
影响因子:
--
作者:
Yavari, M. Reza;Cole, Kevin D.;Rao, Prahalada
通讯作者:
Rao, Prahalada
影响因子:
4.1
作者:
F. Loureiro;W. Mansur
通讯作者:
W. Mansur
DOI:
10.1115/msec2020-8433
发表时间:
2020
期刊:
ASME Manufacturing Science and Engineering Conference
影响因子:
--
作者:
Yavari, Reza;Williams, Richard;Cole, Kevin;Hooper, Paul;Rao, Prahalad
通讯作者:
Rao, Prahalad