User Tools
fdtd:boundary_conditions
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | |||
|
fdtd:boundary_conditions [2018/01/29 23:45] pklapetek |
fdtd:boundary_conditions [2018/01/29 23:47] pklapetek |
||
|---|---|---|---|
| Line 6: | Line 6: | ||
| There are two absorbing boundary conditions implemented in GSvit. Liao boundary conditions is highly effective second order boundary condition, using space and time derivatives of the values at the computational volume boundary. Convolutional perfectly matched layer (CPML) is one of the best available boundary conditions for FDTD at present, providing a layer of graded optical properties and stretched coordinates that lead to absorption of an electromagnetic wave with almost no backreflection. | There are two absorbing boundary conditions implemented in GSvit. Liao boundary conditions is highly effective second order boundary condition, using space and time derivatives of the values at the computational volume boundary. Convolutional perfectly matched layer (CPML) is one of the best available boundary conditions for FDTD at present, providing a layer of graded optical properties and stretched coordinates that lead to absorption of an electromagnetic wave with almost no backreflection. | ||
| + | ---- | ||
| + | // | ||
| + | {{ :samples:img_boundary_liao.png?100|}} | ||
| + | Sample parameter file: {{samples:boundary_liao.tar.gz|2nd order boundary condition}}. | ||
| + | \\ | ||
| + | A 200x200x200 computational domain with single point source | ||
| + | // | ||
| + | ---- | ||
| + | // | ||
| + | {{ :samples:img_boundary_cpml.png?100|}} | ||
| + | Sample parameter file: {{samples:boundary_cpml.tar.gz|CPML boundary condition}}. | ||
| + | \\ | ||
| + | A 200x200x200 computational domain with single point source. | ||
| + | // | ||
| + | ---- | ||
| To compare the efficiency of Liao boundary condition and CPML we performed a simulation of a short pulse traveling in the computational volume, showing the backreflection from one side. As seen below, CPML provides much smaller reflection. The difference between both approaches is even more pronounced if we consider waves that are incident at high angles with respect to computational volume boundary normal. | To compare the efficiency of Liao boundary condition and CPML we performed a simulation of a short pulse traveling in the computational volume, showing the backreflection from one side. As seen below, CPML provides much smaller reflection. The difference between both approaches is even more pronounced if we consider waves that are incident at high angles with respect to computational volume boundary normal. | ||
fdtd/boundary_conditions.txt · Last modified: 2018/01/29 23:47 by pklapetek
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial 4.0 International
