How can write this Code???
 

How can solve this problem and write a code for it in fortran or matlab ???
At least part a or b?http://uupload.ir/files/onxo_studio_20161214_173312.jpg

What have you attempted so far?

You mean besides uploading a ridiculously large image to a forum and waiting for other people to do his homework? Pardon my sarcasm, but that is not how asking for help works.
Here is a better approach https://www.cfd-online.com/Forums/si...tml#post612025