"levels of grid" is a correct and usable phrase in written English
You could use it to refer to different levels of detail or organization in a grid. For example, "We used three levels of grid to organize our data."
We applied three levels of grid searches, from rough to fine grid intervals (Table 1).
Performance of multiscale and multiphysics test cases are illustrated with many levels of grid refinement and comparison with commonly used schemes in the literature.
For the coplanar case, in which non-regular structures will exist at all levels of grid refinement for standard FVMs, the RMSE is as much as 25 times smaller.
Results from a one-scenario analysis (using fixed costs and electricity demand levels, varying penetration levels) of grid vs. off-grid alternatives in Kenya found that under most demand and geographic conditions, extension of the national grid would be less costly than off-grid options [17].
We demonstrate in a number of numerical test problems that IMEX methods in conjunction with efficient preconditioning become more efficient than explicit methods for systems exhibiting high levels of grid-induced stiffness.
But in practice, the order of a numerical method often depends on space location and is not accurately satisfied on different levels of grids used in the extrapolation formula.
For simplicity, we neglect the amount of work needed to solve the equations on the coarsest grid and the transfer operators (include interpolation and restriction) between different levels of grids since it normally counts 10 20% of the total cost of the algorithm.
We need to deal with an aging infrastructure of power systems and maintain the required level of grid reliability.
Such a method guaranties computational efficiency by ensuring that the finest level of grid is located near the interface.
Also, the variation of the injection pressure shrinks with an increase in the level of grid refinement, showing a convergent trend.
The magnitude of ϵ, a parameter which keeps the weights bounded, and the level of grid resolution are shown to determine the order of the scheme in a non-trivial way.
