********************* Orthogonalization ********************* :: Orthogonalization = {classic | modified} ----------------------- Description / Usage ----------------------- This optional card selects the orthogonalization scheme used internally for the gmres solution algorithm (see the *Solution Algorithm* card). Valid options are classic | classical Two steps of classical Gram-Schmidt orthogonalization. modified A modified Gram-Schmidt orthogonalization. If the *Orthogonalization* card is omitted, then the default selection is **classic.** Goma’s parser will accept **classical** as equivalent to **classic.** ------------ Examples ------------ Following is a sample card: :: Orthogonalization = modified ------------------------- Technical Discussion ------------------------- By specifying **modified,** the user is greatly speeding up the **gmres** algorithm at the expense of possibly losing convergence. A good indication that you should not have used the **modified** setting is a premature “leveling off” of the sequence of residuals produced internally within **gmres.**