grid on a circle
 

hey

may be my question will confuse evrybody but i wil try to put the issue in words..

i need to make a grid around the circle... there are different grids like O, C or H type.
the generation of O grids is easy but what i want is that on the boundaries the grid boxes should be square (means the intersecting lines should be at 90 degrees)... for this requirement i cant use O grid and neither C or H... C grid will have the same problem as O grid on the top and lower boundaries and H grid cant be applied as it is circle and surafce is curved..

I am thinking to make mesh in two steps.. around the circle O grid and then all around try to make a border of rectangle in which the grids would be at right angles..

any other suggestions...

Dear freinds:
Do you mean the cartesian grid system.

yes exactly.. this is the kind of grid i want ?? any ideas how to make it in fortran.. would like to know the procedure to do it..

thanks

dear friends.
this kind of grid can be generated base on the quadra tree data structure in fortran.
i have study this problem for 2 years. according to my experience, there are no free code in the web. tried to find some paper for reference.

thanks for info; any paid codes on web in fortran for this problem??
regards