petsc-3.10.5 2019-03-28
TSAlpha2SetParams
sets the algorithmic parameters for TSALPHA2
Synopsis
#include "petscts.h"
PetscErrorCode TSAlpha2SetParams(TS ts,PetscReal alpha_m,PetscReal alpha_f,PetscReal gamma,PetscReal beta)
Logically Collective on TS
Second-order accuracy can be obtained so long as
\gamma = 1/2 + alpha_m - alpha_f
\beta = 1/4 (1 + alpha_m - alpha_f)^2
Unconditional stability requires
\alpha_m >= \alpha_f >= 1/2
Input Parameter
| ts | - timestepping context
|
| \alpha_m | - algorithmic paramenter
|
| \alpha_f | - algorithmic paramenter
|
| \gamma | - algorithmic paramenter
|
| \beta | - algorithmic paramenter
|
Options Database
Note
Use of this function is normally only required to hack TSALPHA2 to
use a modified integration scheme. Users should call
TSAlpha2SetRadius() to set the desired spectral radius of the methods
(i.e. high-frequency damping) in order so select optimal values for
these parameters.
See Also
TSAlpha2SetRadius(), TSAlpha2GetParams()
Level
advanced
Location
src/ts/impls/implicit/alpha/alpha2.cImplementations
TSAlpha2SetParams_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
| -ts_alpha_alpha_m <alpha_m> | - . -ts_alpha_alpha_f <alpha_f>
|
| -ts_alpha_gamma <gamma> | - - -ts_alpha_beta <beta>
|