Eigen Number of modes

Eigen Number of modes = <int>

Description/Usage

This optional card specifies how many modes (eigenvalue/eigenvector pairs) are to be computed during linear stability analysis. The input values are:

N

Number of eigenvalue/eigenvector pairs (modes) to compute.

The default value for N is 10.

Examples

Here is a sample card:

Eigen Number of modes = 10

Technical Discussion

When the Linear Stability card indicates stability analysis should be performed, this card is used when computing the spectrum. Generally, the user is indicating that they would like to compute the leading N modes. Judicious selection of other pameters is required for this to happen. See the Eigen Initial Shifts card, especially.

This card is applicable to both eggroll and ARPACK eigensolvers.

Theory

No Theory.

FAQs

No FAQs.

References

No References.