Description: Defines data needed to perform complex eigenvalue analysis.
Format:
Example:
Field | Definition | Type | Default | ||||
---|---|---|---|---|---|---|---|
SID | Set identification number. | Integer > 0 | Required | ||||
METHOD | Method of complex eigenvalue extraction, one of the following character variables: ARNO, HESS, or CLAN. See Remark 2. | Character | ARNO | ||||
NORM | Method for normalizing eigenvectors, one of the following character variables: MAX or POINT
|
Character | MAX | ||||
G | Grid point identification number. | Integer > 0 | Required for NORM = POINT | ||||
C | Component number of global coordinate. | 1 ≤ Integer ≤ 6 | Required for NORM = POINT | ||||
CTOL | Eigenvalue convergence tolerance. | Real or blank | 1.0E-6 | ||||
ND | Number of roots desired. | Integer > 0 | Required | ||||
NIVEC | Number of additional iteration vectors. | Integer > 0 | 9 | ||||
MAXITER | Maximum number of iterations. | Integer > 0 | 100 | ||||
XC | Extraction criteria, one of the following character variables: LM, SM, LR, SR, LI, SI or AUTO. See Remark 3. | Character | AUTO | ||||
ALPHA | Real component of Hessenberg shift scale. | Real or blank | |||||
OMEGA | Imaginary component of Hessenberg shift scale. | Real or blank |
Remarks:
XC Setting | Extraction Method Used |
---|---|
LM | Largest magnitude |
SM | Smallest magnitude |
LR | Largest real component |
SR | Smallest real component |
LI | Largest imaginary component |
SI | Smallest imaginary component |
AUTO | Automatic based on damping |
The AUTO setting selects the best option based on the type of damping specified.