Local refinement

In every part of the world, the same type of classification as above is found for fuels premium or regular, with or without lead. The octane numbers can be different from one country to another depending on the extent of development of their car populations and the capabilities of their local refining industries. The elimination of lead is becoming the rule wherever there are large automobile populations and severe anti-pollution requirements. Thus the United States, Japan and Canada no longer distribute leaded fuels. (... 

It was shown that there were no differences between the flow solutions whether a completely fine mesh was used or a locally refined mesh. This mesh had a node spacing equal to the size of the gap at the sphere contact points at these locations, gradually grading toward a four times coarser node spacing near the voids in the geometry. The node distributions on the sphere surface were also graded from fine near the contact point to coarser away from the... 

Pattern 16.13, Optimization Apply localized refinements to make the project run faster. 

A constant displacement rate of Im/s was applied to the striker (Fig. 4). A locally refined FV mesh with 25875 cells was generated. Five levels of refinement on the specimen side and four levels on the striker/anvil side were used to have a sufficient number of similar sized cells in contact. At an average load there were around 20 cells in contact at the striker/specimen contact and around 10 cells for the specimen/anvil contact. 

It is wise to remember that the term refinement means exactly what it says it means the minimization of small errors. Refinement is most certainly not a stage of structure determination as is sometimes supposed. The initial model must be a good approximation to the truth. If it is distant from the actual structure, either overall or locally, refinement is unlikely to correct those errors and result in a correct structure. Thus it is important, in practice, not to build a sloppy or careless model, or a model based on a wing and a prayer, and then hope that refinement will find the right solution or fix the problems. 

American peartash Locally refined potassium carbonate. 

VHN. Hardness through the weld region varied between approximately 240 and 280 VHN, with an average hardness of approximately 260 VHN. A slight increase in hardness in the stir zone may be inferred from the results. The increased hardness in the stir zone may have stemmed from the locally refined grain size through the Hall-Petch relation. 

Viswanathan N, Chu C (2005) FastPlace efficient analytical placement using cell shifting, iterative local refinement and a hybrid net model. IEEE Trans, on CAD 24(5) 722-733... 

Obtaining a mesh with local refinement in regions of rapid variation of the flow and curvature of the wall. 

The essential difference between Multi-level Adaptive Techniques and Multi-grids (MGs) Is that, as the name suggests, MLATs use locally refined grids (a locally refined grid Is one In which certain areas of the computational domain have a finer mesh spacing than that used elsewhere) whereas MGs use globally refined grids. 

Finite Element Approach for Density Functional Theory Calculations on Locally-Refined Meshes. 

If the methods referred to earlier are used with care, CFD can predict the power number of an impeller in a single-phase system to within 20%. A well-chosen grid with local refinement around the impeller and at least 200 0(X) cells is required. The only successful method seems to be to integrate the torqne on the impeller. Summation of energy dissipation, e, over the vessel does not give the... 

M. Krol, R. A. Chaleil, A. L. Tournier, and P. A. Bates, Proteins, 69, 750-757 (2007). Implicit Flexibility in Protein Docking Cross-Docking and Local Refinement. 

Figure 6.27 (a) Global and (b) local refinement of a mesh, starting from upper left and moving clockwise. 

---