"$CellNumber" 修訂間的差異
出自 DDCC TCAD TOOL Manual
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| (未顯示同一使用者於中間所作的 9 次修訂) | |||
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=='''Format'''== |
=='''Format'''== |
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| − | $TimeStep |
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| + | $CellNumber |
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| ⚫ | |||
| + | ''N<sub>x</sub>'' |
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| + | ''N<sub>y</sub>'' |
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| − | <font size=3>This value tells the program what the total of time steps is.</font> |
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| + | <font size=3>This defines the number of nodes in ''x'', ''y'', and ''z'' directions without the layer of PML. That is, the total number of nodes in simulation may '''NOT''' be <math>\begin{smallmatrix}{N_x \times N_y\times N_z}\end{smallmatrix}</math>.</font><br><br> |
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| + | <font size=3 color=red>'''NOTE 1'''<font color=black>: The priority of this function is below the function -- [[$Deltaxyz]], ''i.e.'', the program abandons [[$CellNumber]] while using [[$Deltaxyz]].</font><br> |
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| + | '''NOTE 2'''<font color=black>: Since the position of the last point would not be beyond the boundary we set in [[$SpaceRegion]], the mesh size may be different with what we think on intuition. For instance, if Nx=101 and x is from 0~100e-9 (m), so dx = 100e-9/(101-1'''+0.5''') ~9.95e-10 (m). (due to the equivalent array size in 6 field.) |
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| + | </font></font> |
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=='''Example'''== |
=='''Example'''== |
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| − | $TimeStep |
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| + | $CellNumber |
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| − | + | 201 |
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| + | 201 |
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| + | 201 |
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| + | Thus, without PML, there is 201 nodes in ''x'' direction, so as the number of nodes are in ''y'' and ''z'' direction. |
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| − | Then the program is going to run 500 time steps. |
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| + | == '''Related commands''' == |
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| + | : [[$SpaceRegion]], [[$CellNumber]], [[$Deltaxyz]] |
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於 2018年10月12日 (五) 10:17 的最新修訂
Format
$CellNumber Nx Ny Nz // where Nx, Ny, Nz are integers.
This defines the number of nodes in x, y, and z directions without the layer of PML. That is, the total number of nodes in simulation may NOT be 
.
NOTE 1: The priority of this function is below the function -- $Deltaxyz, i.e., the program abandons $CellNumber while using $Deltaxyz.
NOTE 2: Since the position of the last point would not be beyond the boundary we set in $SpaceRegion, the mesh size may be different with what we think on intuition. For instance, if Nx=101 and x is from 0~100e-9 (m), so dx = 100e-9/(101-1+0.5) ~9.95e-10 (m). (due to the equivalent array size in 6 field.)
Example
$CellNumber 201 201 201
Thus, without PML, there is 201 nodes in x direction, so as the number of nodes are in y and z direction.
Related commands
- $SpaceRegion, $CellNumber, $Deltaxyz
