<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:10pt"><div><span>Dear all, <br></span></div><div><span>Summer greetings, <br></span></div><div><span>I am back with an other query.</span></div><div><span>Before I successfully implement the projection preconditioner which was simply <br></span></div><div><span>the coarse grid correction operator P = I - A*(P*A_H*R); <br></span></div><div><span>I implemented this simply keeping both pre and post smoothing dummy in PCMG setup. <br></span></div><div><span>Now I need to revise this and re-implement this where I replace A and coarse operator A_H with <br></span></div><div><span>preconditioned one i.e. M^-1 A and M^-1 A_H respectively. Thus new projection reads as</span></div><div><span> <br></span></div><div><br><span></span></div><div><span>P_new = I - (M^-1 A) {P*(M_H^-1 A_H)*R}</span></div><div><br><span></span></div><div><span>Any suggestion to
implement this in Petsc would be appreciated. <br></span></div><div><br><span></span></div><div><span>Thanking in anticipation. <br></span></div><div><span>with regards, Abdul <br></span></div><div><span style="color:rgb(0, 0, 255);"><span style="font-family:verdana, helvetica, sans-serif;"><span style="font-family:lucida console, sans-serif;"></span></span></span><span style="color:rgb(0, 0, 255);"><span style="font-family:verdana, helvetica, sans-serif;"></span></span></div></div></body></html>