Nonlinear LU-SGS solver

Description

Describe here the Nonlinear LU-SGS solver in simple terms

 http://pdf.aiaa.org/preview/CDReadyMASM07_1064/PV2007_313.pdf

 http://wehsff.imamod.ru/pages/Minisymposium%201%20Aeroacoustics.%20From%20Physics%20to%20Numerics%20and%20Back/Parsani.pdf

 http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHY-4XGBG5J-4&_user=1011600&_coverDate=02%2F01%2F2010&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1268745897&_rerunOrigin=google&_acct=C000050280&_version=1&_urlVersion=0&_userid=1011600&md5=9ef4740455dd6aa9fe1717e460c27d28

 http://stro.vub.ac.be/contactforum/

 http://www.iacm-eccomascongress2008.org/frontal/ProgSesion.asp?id=686]