petsc-3.5.4 2015-05-23
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TSAlphaSetRadius

 sets the desired spectral radius of the method (i.e. high-frequency numerical damping)

Synopsis

#include "petscts.h"   
PetscErrorCode  TSAlphaSetRadius(TS ts,PetscReal radius)
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)

Input Parameter

ts - timestepping context
radius - the desired spectral radius

Options Database

-ts_alpha_radius <radius> -

See Also

TSAlphaSetParams(), TSAlphaGetParams()

Level:intermediate
Location:src/ts/impls/implicit/alpha/alpha.c
Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages