[lsb1292]

Hello

I am reading the OpenFOAM Guide and

in Multi-grading of a block section I have some questions

blocks
(
hex (0 1 2 3 4 5 6 7) (100 300 100)
simpleGrading (1 2 3);
);

- split the block into 3 divisions in the y-direction, representing 20%, 60% and 20% of the block length;
- include 30% of the total cells in the y-direction (300) in each divisions 1 and 3 and the remaining 40% in division 2;
- apply 1:4 expansion in divisions 1 and 3, and zero expansion in division 2.

We can specify this by replacing the y-direction expansion ratio "2" in the example above with the following:

blocks
(
hex (0 1 2 3 4 5 6 7) (100 300 100)
simpleGrading
(
1 // x-direction expansion ratio
(
(0.2 0.3 4) // 20% y-dir, 30% cells, expansion =4
(0.6 0.4 1) // 60% y-dir, 40% cells, expansion =1
(0.2 0.3 0.25) // 20% y-dir, 30% cells, expansion =0.25
)
3 // z-direction expansion ratio
(
);

I don't understand what Guide says...
could anyone rephrase or explain what guide says?

Thank you