?-->FAS and AMG for coupled solver

Harry Qiu

Dear Mr. or Mrs.:

I do read parts of FLUENT USER GUIDE which is relevant to AMG and FAS(coupled solver) again and again. But I alway can't understand these two numerical technology completely, because my mother language is not English. Could you explain AMG and FAS in brief, especilly how to use them?

Thank you very much. Sincerely, Harry.