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The minimum element size has been fixed about 0.81 μm, which is enough for mapping different sizes of air holes.
In addition, results obtained by means of the minimum element size procedure are shown for comparison purposes.
The models are meshed using triangular elements with refined mesh sizes in the porous area; the maximum element size is 10 nm and the minimum element size is 0.9 Å.
To accurately map the topography and bathymetry of the region to the mesh, a minimum element size of approximately 400 m at the upper boundary was chosen, and the mesh was coarsened to a maximum size of 8000 m at the lower boundary.
Note that this is a highly nonuniform grid as the ratio of the maximum to the minimum element size is much greater than one.
This is also a highly nonuniform grid as the ratio of the maximum to the minimum element size is up to 12.5.
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On this kind of computational domain, the determination of timesteps based on minimum element sizes is found to be less efficient.
The geometry was divided into a free tetrahedral mesh with maximum and minimum element sizes of 40.6 and 0.05 μm, respectively resulting in 14 519 008 elements for the most complex chip design investigated.
Scanning electron microscopy images of photonic crystal structures reveal a minimum structural element size of approximately 300 nm.
In the AMR algorithm [ 10, 13] designed for uniform or quasi-uniform grids, the timestep size is typically selected to be proportional to the minimum of element sizes (multiplied by an estimated wave speed) in a grid in order that the numerical waves or discontinuities will never propagate more than one element within a single timestep.
Mr Crombie said that while the insurer was still devising the structure of its demutualisation, any windfall for members would probably comprise a fixed minimum element, plus a second variable component, which would take account of the size of the policy with Standard Life and the length of time it had been held.
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