In this paper, a discontinuous Galerkin time domain (dgtd) method based on multilevel local time stepping (LTS) scheme for field-circuit co-simulation is proposed. With the proposed method, different time steps can be...
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ISBN:
(纸本)9781665432436
In this paper, a discontinuous Galerkin time domain (dgtd) method based on multilevel local time stepping (LTS) scheme for field-circuit co-simulation is proposed. With the proposed method, different time steps can be selected in accordance with the local stability conditions, which can greatly reduce the calculation time. The efficiency improvement of the method is verified by the simulation of waveform selection metasurfaces.
The temperature-drift effect of microstrip filters is analyzed by the proposed electromagnetic-thermal co simulation method based on parallel high-order discontinuous Galerkin time domain (dgtd) and finite-element tim...
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The temperature-drift effect of microstrip filters is analyzed by the proposed electromagnetic-thermal co simulation method based on parallel high-order discontinuous Galerkin time domain (dgtd) and finite-element time-domain (FETD) algorithms with a memory reduction technique. The element matrices of dgtd method are factorized into the product of coefficient matrices and universal matrices. The coefficient matrices are different for each tetrahedral element and need to be stored for all the elements. While the universal matrices are the same for all the tetrahedral elements and only need to be stored for one element. Since the sizes of the coefficient matrices are much smaller than the element matrices of dgtd method, the proposed method avoids storing the large element matrices and greatly reduce the memory requirement of the dgtd method. Thus it reduces the memory requirement of the whole electromagnetic-thermal co-simulation which is dominated by the memory consumption of the dgtd method. Large-scale parallel technique is adopted to accelerate the process of electromagnetic-thermal co-simulation. The proposed method provides a very powerful tool for temperature-drift effect analysis of microstrip filters.
The numerical modeling of light interaction with nanostructured materials is at the heart of many computational photonics studies. A typical example of interest to the present work is the simulation of light trapping ...
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ISBN:
(数字)9781510619265
ISBN:
(纸本)9781510619265
The numerical modeling of light interaction with nanostructured materials is at the heart of many computational photonics studies. A typical example of interest to the present work is the simulation of light trapping in complex photovoltaic devices. This can be a challenging task when the underlying material layers are textured in a very general way. Very often, such studies rely on the Finite Difference Time-Domain (FDTD) method. The FDTD method is a widely used approach for solving the system of time-domain Maxwell equations in the presence of heterogenous media and complex three-dimensional structures. In the classical formulation of the this method, the whole computational domain is discretized using a uniform structured (Cartesian) grid. In this work, we consider an alternative approach by adapting and exploiting a particular finite element method, which is able to deal with topography conforming geometrical models based on non-uniform discretization meshes. The underlying modeling method is known as the Discontinuous Galerkin Time-Domain (dgtd) method. It is a discontinuous finite element type that relies on a high order interpolation of the electromagnetic field components within each cell of an unstructured tetrahedral mesh.
The discontinuous Galerkin time domain (dgtd) method and equivalent physical model are adopted to simulation microwave circuit with PIN diode. Compared with the existing field-circuit co-simulation method, the propose...
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ISBN:
(数字)9780996007894
ISBN:
(纸本)9781728146331
The discontinuous Galerkin time domain (dgtd) method and equivalent physical model are adopted to simulation microwave circuit with PIN diode. Compared with the existing field-circuit co-simulation method, the proposed method inherits the advantages of dgtd method. The final EM-circuit system equation is only related to the element connected with the circuit network. So only a small nonlinear equation stem from the equivalent physical model of PIN diode is solved at each time step. Numerical examples are given to demonstrate the capability of the proposed method.
There are more and more multiscale problems in recent years, the multiscale method has received a lot of attention. However there is pretty few researches about multiscale numerical algorithms in computational electro...
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ISBN:
(纸本)9781538624166
There are more and more multiscale problems in recent years, the multiscale method has received a lot of attention. However there is pretty few researches about multiscale numerical algorithms in computational electromagnetism. A family of new multiscale finite element method called Multiscale Hybrid-Mixed method has many advantages to deal with the electromagnetic problems when it combine with Discontinuous Galerkin Time Domain (dgtd) method in the second level. In this article, MHM-dgtd method is used for the calculation of resonant cavity. We further explore the computational performance of this method. Moreover, we will apply the MHM-dgtd method to calculate electromagnetic problems with complex structure or microstructure in future work.
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