TSRKSetMultirate

Use the interpolation-based multirate TSRK method

Synopsis

#include "petscts.h"   
PetscErrorCode TSRKSetMultirate(TS ts, PetscBool use_multirate)

Logically Collective

Input Parameters

• ts - timestepping context

• use_multirate - PETSC_TRUE enables the multirate TSRK method, sets the basic method to be RK2A and sets the ratio between slow stepsize and fast stepsize to be 2

Options Database Key

• -ts_rk_multirate - <true,false>

Note

The multirate method requires interpolation. The default interpolation works for 1st- and 2nd- order RK, but not for high-order RKs except TSRK5DP which comes with the interpolation coefficients (binterp).

See Also

TS: Scalable ODE and DAE Solvers, TSRK, TSRKGetMultirate()

Level

intermediate

Location

src/ts/impls/explicit/rk/rk.c

Implementations

TSRKSetMultirate_RK() in src/ts/impls/explicit/rk/mrk.c

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