PETSc version 3.15.5
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
|  | -ts_alpha_alpha_m <alpha_m> | 
|  | -ts_alpha_alpha_f <alpha_f> | 
|  | -ts_alpha_gamma   <gamma> | 
|  | -ts_alpha_beta    <beta> | 
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.c
Implementations
TSAlpha2SetParams_Alpha in src/ts/impls/implicit/alpha/alpha2.c
Index of all TS routines
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Index of all manual pages