No, I'm not sure if it should. It belongs to the same category as
"problem_type" == TS_LINEAR / == TS_NONLINEAR.
Emil
On 6/18/15 11:15 AM, Abhyankar, Shrirang G. wrote:
Can the DAE equation type be supplied via a run-time option?
Shri
-----Original Message-----
From: barry smith <bsm...@mcs.anl.gov>
Date: Thursday, June 18, 2015 at 11:08 AM
To: Italo Tasso <it...@tasso.com.br>, "Constantinescu, Emil M."
<emcon...@mcs.anl.gov>
Cc: "petsc-users@mcs.anl.gov" <petsc-users@mcs.anl.gov>
Subject: Re: [petsc-users] arkimex rejecting all dt in petsc 3.6.0
Here is the response from Emil who made the changes to the code
If you are solving a DAE then in the new version, we introduced a new
flag that distinguishes between ODEs and DAEs leading to different
semantics. For DAEs this is needed b/c it may not have consistent initial
conditions.
If solving DAEs, the user has to set the EquationType appropriately:
e.g.,
ierr = TSSetEquationType(ts,TS_EQ_DAE_IMPLICIT_INDEX1);CHKERRQ(ierr);
This is documented in the doc, but I didn't add it to the changelog (Jed
pointed it out to me).
Currently it only affects -ts_type arkimex. I'll work with Satish to add
it to the changelog.
*If that's not the case:* let me know and we can dig deeper.
Emil
On Jun 18, 2015, at 5:48 AM, Italo Tasso <it...@tasso.com.br> wrote:
I just upgraded to 3.6.0 and my code stopped working. All dt are
rejected. I used the same configure line, same code, same everything.
With 3.5.4 I get:
0 TS dt 1e-06 time 0
0 SNES Function norm 2.549981005316e+05
1 SNES Function norm 6.107056905987e-03
2 SNES Function norm 1.483881932064e-10
3 SNES Function norm 9.122873794272e-11
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 3
0 SNES Function norm 7.790429171165e+04
1 SNES Function norm 7.289068747803e-04
2 SNES Function norm 8.227639633330e-11
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 2
0 SNES Function norm 1.154356516184e+05
1 SNES Function norm 2.309925413255e-03
2 SNES Function norm 6.382141981406e-11
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 2
TSAdapt 'basic': step 0 accepted t=0 + 1.000e-06
wlte=0.000654 family='arkimex' scheme=0:'3' dt=1.000e-05
With 3.6.0 I get:
0 TS dt 1e-06 time 0
0 SNES Function norm 2.549981005316e+05
1 SNES Function norm 6.107056925316e-03
2 SNES Function norm 1.519319591792e-10
3 SNES Function norm 9.070104116945e-11
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 3
0 SNES Function norm 7.790429171165e+04
1 SNES Function norm 6.942541792651e-04
2 SNES Function norm 8.458781909516e-11
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 2
0 SNES Function norm 1.154356516184e+05
1 SNES Function norm 2.287202942961e-03
2 SNES Function norm 6.585201377573e-11
Nonlinear solve converged due to CONVERGED_FNORM_ABS iterations 2
TSAdapt 'basic': step 0 rejected t=0 + 1.000e-06 wlte=
324 family='arkimex' scheme=0:'3' dt=1.311e-07
Any ideas? I attached the full output.
Options I use:
-ts_view -ts_type arkimex -ts_arkimex_fully_implicit -ts_adapt_monitor
-ts_monitor -snes_monitor -snes_converged_reason -ksp_type preonly
-pc_type lu -pc_factor_mat_solver_package mumps -snes_rtol 0 -snes_atol
1e-10 -snes_stol 0
<petsc354.txt><petsc360.txt>
