petsc-3.7.4 2016-10-02
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sets the desired spectral radius of the method (i.e. high-frequency numerical damping)

### Synopsis

#include "petscts.h"

Logically Collective on TS

The algorithmic parameters \alpha_m and \alpha_f of the generalized-\alpha method can be computed in terms of a specified spectral radius \rho in [0,1] for infinite time step in order to

### control high-frequency numerical damping

\alpha_m = 0.5*(3-\rho)/(1+\rho) \alpha_f = 1/(1+\rho)