CST2013: Eigenmode Solver Specials (AKS)

Simulation: Solver Start Simulation Eigenmode Solver Specials

Estimation of highest eigenfrequency frame

In this dialog group one can choose between an automatic estimation of the highest eigenfrequency or enter a user defined value if this frequency is already known (e.g. from a previous calculation).

In addition, you can chose an automatic estimation refinement. Thus, the maximum number of estimation cycles can be set. Many estimation cycles might lead to a very long simulation time, because for each cycle, the complete eigenvalue problem has to be solved with minor accuracy.

Guess (0 if unknown): Enter a user defined value for the highest eigenfrequency. If the highest eigenfrequency is unknown set the value to 0. In this case the highest eigenfrequency is estimated automatically.

Automatic estimation refinement: Check if you want to refine the estimation of the highest eigenfrequency.

Max. number of cycles: Enter the maximum number of cycles for an automatic estimation refinement.

Iterations: Specify the maximum number of iterations to be performed. The calculation will stop after this number of iterations even when the desired accuracy has not been reached so far. This option only applies to the AKS eigenmode solver method.  

For further information on how to choose the highest eigenfrequency see the Eigenmode Solver Overview.

Special solver controls frame

Penalty factor: This factor can be used to eliminate unwanted static solutions by entering a value between 1 and 100. In most cases it is not necessary to change this parameter, if a good estimation of the highest eigenfrequency was applied.

Accuracy: This setting determines the relative difference between two solutions during the iterative computation of eigenvectors. A small number (<1e-6) generally reduces the solver error while the simulation time increases (keep in mind that there are also other error types which might be significantly larger than the solver error).

Consider static modes: If the box is checked then the static modes are saved and can be accessed via the result tree. Otherwise the static modes are not saved.

OK

Accepts the changes and closes the dialog.

Cancel

Closes this dialog box without performing any further action.

Help

Shows this help text.