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
Input Parameters#
- ts - timestepping context 
- alpha_m - algorithmic parameter 
- alpha_f - algorithmic parameter 
- gamma - algorithmic parameter 
- beta - algorithmic parameter 
Options Database Keys#
- -ts_alpha_alpha_m <alpha_m> - set alpha_m 
- -ts_alpha_alpha_f <alpha_f> - set alpha_f 
- -ts_alpha_gamma - - set gamma
- -ts_alpha_beta - - set beta
Notes#
Second-order accuracy can be obtained so long as:
Unconditional stability requires: $\( \alpha_m >= \alpha_f >= 1/2. \)$
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#
TS: Scalable ODE and DAE Solvers, TS, TSALPHA2, TSAlpha2SetRadius(), TSAlpha2GetParams()
Level#
advanced
Location#
Implementations#
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