petsc-3.12.5 2020-03-29

TSAlphaSetParams

sets the algorithmic parameters for TSALPHA

#include "petscts.h"   
PetscErrorCode TSAlphaSetParams(TS ts,PetscReal alpha_m,PetscReal alpha_f,PetscReal gamma)

Logically Collective on TS

\gamma = 0.5 + alpha_m - alpha_f

\alpha_m >= \alpha_f >= 0.5

\alpha_m = \alpha_f = gamma = 1

	-ts_alpha_alpha_m <alpha_m>	- . -ts_alpha_alpha_f <alpha_f>
	-ts_alpha_gamma <gamma>	- Note: Use of this function is normally only required to hack TSALPHA to use a modified integration scheme. Users should call TSAlphaSetRadius() to set the desired spectral radius of the methods (i.e. high-frequency damping) in order so select optimal values for these parameters.

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