[immortality]

in what areas we use other methods other than simple?

numberOfSubdomains 4;

method          simple;

simpleCoeffs
{
    n               ( 4 1 1 );
    delta           0.001;
}

hierarchicalCoeffs
{
    n               ( 1 1 1 );
    delta           0.001;
    order           xyz;
}

manualCoeffs
{
    dataFile        "";
}

distributed     no;

roots           ( );

[chegdan]

There is a User Guide, read it for more information. I hope this helps

[immortality]

Yes thanks.I had read it.its too briefly.doesn't focus on differents between methods.
I don't need to know them widely now.but only wanted and was curious to know about different methods on paralleling and also have a good thread to be a source of persons interested in now or in the future to refer here.
I think its a good idea that everyone don't hesitate to put their opinions and experiences or what read about in this thread to share to others.