Hi Barry,
src/ts/examples/tutorials/ex40.c (run with ARKIMEX3 and initial dt=1e-2)
has the same behavior:
TSEvent: iter 0 - Event 0 interval detected [3.61 - 4.11]
TSEvent: iter 1 - Stepping forward as no event detected in interval
[3.61 - 4.07796]
TSEvent: iter 2 - Stepping forward as no event detected in interval
[4.07796 - 4.08161]
TSEvent: Event 0 zero crossing at time 4.08163 located in 3 iterations
Ball hit the ground at t = 4.08 seconds
TSAdapt basic arkimex 0:3 step 13 accepted t=4.11 +
1.000e-02 dt=1.000e-01 wlte= 0 wltea= -1 wlter= -1
TSAdapt basic arkimex 0:3 step 14 accepted t=4.12 +
1.000e-01 dt=5.000e-01 wlte= 0 wltea= -1 wlter= -1
It continues at the end of the "event interval" with the initial timestep.
Best Regards,
Moritz
Am 03.02.19 um 02:43 schrieb Smith, Barry F.:
On Feb 2, 2019, at 12:08 PM, Moritz Huck via petsc-users
<petsc-users@mcs.anl.gov> wrote:
Hi,
I am trying to use SetEventHandler.
I hav eencountered two "problems":
1. after an event is encountered the next time step is needlessly small
(h=1e-6), even if a don't change anything in the function (for testing).
2. the integration does not continue at the event encounter
e.g. my eventfunction is g(t,u)=t-1,
the event is found in the step from t= 0.9 to 1.1 at tevent=1
but the next step is not 1+dt but it is 1.1 + dt
I would expect the next step to be 1.+dt
Hmm, this sounds like it could be an error. Could you send us a simple
code that exhibits it?
Thanks
Barry
Best Regards,
Moritz
