| gamemakerh |
January 21, 2016 06:47 |
Very strange problem with DPM combustion model
Hi guys.
I encountered very strange problem with ansys fluent
I try to simulate non-premixed combustion process in ansys fluent. I have injector which inject particles into pipe and after some time particles starts to evaporate. Evaporated particles ignites and produces heat, pressure and etc.
But I encountered strange particles behavior. Particles starts to appear in various places (please see video)
https://www.youtube.com/watch?v=pCqLEM73JOA
P.S. mesh is adapted by these gradients every time step.
Maybe someone have encountered same problem ? It would nice to know someone has solved this problem because I am out of ideas...
Code:
mark_pres adapt/mark-with-gradients pressure space-gradient 2 yes 0.1 0.01 no 0 0 0
mark_vel adapt/mark-with-gradients velocity space-gradient 2 yes 0.1 0.01 no 0 0 0
mark_turb adapt/mark-with-gradients turb-kinetic-energy space-gradient 2 yes 0.1 0.01 no 0 0 0
dpmcolrat adapt/mark-with-gradients dpm-collision-rate space-gradient 1 yes 0.1 0.01 no 0 0 0
dpmcons adapt/mark-with-gradients dpm-concentration space-gradient 1 yes 0.1 0.01 no 0 0 0
dpmsen adapt/mark-with-gradients dpm-omega-source space-gradient 1 yes 0.1 0.01 no 0 0 0
dpm2 adapt/mark-with-gradients dpm-sensible-enthalpy-source space-gradient 1 yes 0.1 0.01 no 0 0 0
dpm3 adapt/mark-with-gradients dpm-tke-source space-gradient 1 yes 0.1 0.01 no 0 0 0
dpm4 adapt/mark-with-gradients dpm-total-enthalpy-source space-gradient 1 yes 0.1 0.01 no 0 0 0
combine adapt/combine-registers 0 1 2 3 4 5 6 7 8
display adapt/display-register 9
adapt adapt/adapt-to-register 9 0 0 yes
Output from console
Code:
Injecting 2 particle parcels with mass 3.36e-07 at t = 0.000661
Advancing DPM injections ....
iter continuity x-velocity y-velocity energy k omega fmean fvar time/iter
! 637 solution is converged
number tracked = 2159, escaped = 0, aborted = 0, trapped = 0, evaporated = 17, incomplete = 0, incomplete_parallel = 0, collided = 628, shed = 25
637 9.3974e-04 8.4527e-09 5.1602e-09 6.6863e-08 1.9989e-08 3.7411e-06 0.0000e+00 0.0000e+00 0:00:06 30
638 1.1210e+00 1.1691e-01 1.2427e-02 8.0195e+03 9.9664e+01 9.0283e+00 0.0000e+00 0.0000e+00 0:00:05 29
absolute pressure limited to 5.000000e+10 in 4 cells on zone 8
Maximum PDF table enthalpy exceeded in 2 cells on zone 8 .
Minimum PDF table enthalpy exceeded in 3295 cells on zone 8 .
turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 12269 cells
# Divergence detected in AMG solver: pressure coupled -> Decreasing coarsening group size!
# Divergence detected in AMG solver: pressure coupled -> Increasing relaxation sweeps!
# You may try the enhanced divergence recovery with (rpsetvar 'amg/protective-enhanced? #t)
Divergence detected - temporarily relaxing and trying again...
Divergence detected - temporarily relaxing and trying again...
Divergence detected - temporarily relaxing and trying again...
Divergence detected - temporarily relaxing and trying again...
Divergence detected - temporarily relaxing and trying again...
Maximum PDF table enthalpy exceeded in 6 cells on zone 8 .
Divergence detected in AMG solver: pressure coupled
Divergence detected in AMG solver: pressure coupled
Divergence detected in AMG solver: pressure coupled
Divergence detected in AMG solver: pressure coupled
Divergence detected in AMG solver: pressure coupled
Divergence detected in AMG solver: pressure coupled
Divergence detected in AMG solver: pressure coupled
Error at host: floating point exception
Minimum PDF table enthalpy exceeded in 3285 cells on zone 8 .
Error at Node 0: floating point exception
Error at Node 1: floating point exception
Error at Node 2: floating point exception
Error at Node 3: floating point exception
Error at Node 4: floating point exception
Error at Node 5: floating point exception
Error at Node 6: floating point exception
turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 12283 cells
Error: floating point exception
Error Object: #f
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