[Night Nine]

Hi everyone,

I am simulating cavitation in the diesel nozzle using Converge 3.0, and i am facing the divergence problem.
The message is the following:

(Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8304, located at (0.00158346, 0.000125, -0.000535289), in region 1, whose level=9

(Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8305, located at (0.00158346, 0.000125, -0.000485289), in region 1, whose level=9

(Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8308, located at (0.00159596, 0.0001625, -0.000547789), in region 1, whose level=10

(Rank 0) FATAL_ERROR: [ 366] Something is wrong in function get_temp_from_table_massfrac: upper_energy_value must be greater than lower_energy_value!
upper_energy_value is -nan(ind), and lower_energy_value is -nan(ind).


I have tried:
-reducing the cell size
-using first order upwind for solving equation
-adjusting cfl number
-adjusting initial pressure of the region
but in vain, the simulation get stop soon in 0.02ms.

Part of the log file has been uploaded.
Hope to get some advice,thanks.

[yli]

Hi, Changhao,
Can you contact our support group to let someone here take a look?(support@convergecfd.com?
Thanks.

Originally Posted by Night Nine

Hi everyone,

I am simulating cavitation in the diesel nozzle using Converge 3.0, and i am facing the divergence problem.
The message is the following:

(Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8304, located at (0.00158346, 0.000125, -0.000535289), in region 1, whose level=9

(Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8305, located at (0.00158346, 0.000125, -0.000485289), in region 1, whose level=9

(Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8308, located at (0.00159596, 0.0001625, -0.000547789), in region 1, whose level=10

(Rank 0) FATAL_ERROR: [ 366] Something is wrong in function get_temp_from_table_massfrac: upper_energy_value must be greater than lower_energy_value!
upper_energy_value is -nan(ind), and lower_energy_value is -nan(ind).


I have tried:
-reducing the cell size
-using first order upwind for solving equation
-adjusting cfl number
-adjusting initial pressure of the region
but in vain, the simulation get stop soon in 0.02ms.

Part of the log file has been uploaded.
Hope to get some advice,thanks.

[Night Nine]

Actually i have connected the support@convergecfd.com early this year, and tried to solve this problem with the advice got, but this problem still exists.

[yli]

Hi, Changhao,

Can you post your inputs.in, solver.in, boundary.in, amr.in and vof.in here? I'll take a look whether there is anything obvious that can be improved.

Originally Posted by Night Nine

Actually i have connected the support@convergecfd.com early this year, and tried to solve this problem with the advice got, but this problem still exists.

[Night Nine]

Thanks so much!
I have packaged the files and uploaded. Very appreciate for your reply.

[yli]

Try something like this revised version. These are just some general revision to make the run more stable. The actual stability performance may also depend on your actual physics and grids.

Originally Posted by Night Nine

Thanks so much!
I have packaged the files and uploaded. Very appreciate for your reply.

[Night Nine]

Very appreciate for your reply, I will try to continue with this adjust,and upload the problem and progress.