petsc-3.13.6 2020-09-29
TSAlpha2SetRadius
sets the desired spectral radius of the method (i.e. high-frequency numerical damping)
Synopsis
#include "petscts.h"
PetscErrorCode TSAlpha2SetRadius(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 = (2-\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
TSAlpha2SetParams(), TSAlpha2GetParams()
Level
intermediate
Location
src/ts/impls/implicit/alpha/alpha2.c
Implementations
TSAlpha2SetRadius_Alpha in src/ts/impls/implicit/alpha/alpha2.c
Index of all TS routines
Table of Contents for all manual pages
Index of all manual pages