petsc-3.7.7 2017-09-25
   
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