Line graphs - vector variables:

Line Graphics Vector File Format.

This file contains the values of the computed vector fields. The header file defines the number of data points in this file.

The file must contain nxyfv rows and nfv columns. The precise format of each piece of data is not critical, but the ordering of the data is critical. The file format is as follows.

  u1(i*h,j*h) v1(i*h,j*h) u2(i*h,j*h) v2(i*h,j*h)  ...     
  u1(i*h+h,j*h) v1(i*h+h,j*h) u2(i*h+h,j*h) v2(i*h+h,j*h)  ...     
  ...

Notes:

1.

Each column corresponds to a vector field. The first number in each row is the first vector field, the second number is the second vector field and so on.

2.

Each column corresponds to a vector field component and pairs of columns correspond to the vectors. The 2jth number in each row is the first component of the jth vector field, and the 2j+1st number in each row is the second component of the jth vector field.

3.

The first two columns of the file correspond to the fluid velocities on the finite-difference computational grid. The second two columns correspond to the generated force vectors on the finite-difference grid.

4.

Each rows corresponds to a point in the domain where the vector fields are computed. The data are listed row-wise (left to right) from the bottom to the top. Therefore, the first nx rows are the vectors along the bottom row (y=ymin and x=i*h, where $i=1,2,\ldots,$nx). The next nx vectors correspond to the second row (y=ymin+h and x=i*h, where where $i=1,2,\ldots,$nx), and so on. The last nx vectors correspond to the final row.

5.

In the current version of IBIS, no other vector fields are computed. However, if at some future time other fields are needed the structure of the file will not need to change.